claim construction Archives

claim construction

Claim construction misstep undoes injunction

by Joshua Revilla | Aug 14, 2025 | Patents

The US Court of Appeals for the Federal Circuit vacated and remanded a preliminary injunction (PI), finding that the district court improperly construed a claim term based on references cited in a provisional application but omitted from the asserted patents. FMC Corp. v. Sharda USA, LLC, Case No. 224-2335 (Fed. Cir. Aug. 21, 2025) (Moore, Chen, Barnett, JJ.)

FMC owns two patents claiming priority to a provisional application concerning insecticides and miticides compositions. The patents specifically cover formulations comprising bifenthrin and a cyano-pyrethroid. Sharda currently markets an insecticide product known as Winner, which contains both bifenthrin and a cyano-pyrethroid.

FMC sued Sharda for patent infringement on its two patents and sought a temporary restraining order (TRO) and a PI. The district court denied both motions but issued a claim construction for the term “composition.” Instead of applying the term’s plain and ordinary meaning, the district court interpreted “composition” narrowly to mean “stable compositions, rather than the well-known unstable compositions that produce ineffective results as discussed throughout the prosecution history.” In reaching this construction, the district court relied on statements made in the provisional application and disclosures found in a separate, non-asserted FMC patent that claimed priority to the same provisional application. However, these disclosures were absent from the asserted patents themselves, appearing only in the provisional application and the non-asserted patent.

FMC renewed its motion for a TRO, which the district court granted and later converted into a PI. In issuing the PI, the district court again relied on its narrow construction of the term “composition” as a key point in rejecting Sharda’s invalidity defenses. Sharda appealed.

Sharda argued that the district court erred in both its construction of “composition” and its determination that Sharda failed to raise a substantial question regarding the patents’ validity. The Federal Circuit first addressed Sharda’s challenge to the district court’s construction of the term “composition,” which had been limited to stable compositions based on disclosures in the provisional application and a non-asserted patent. The Court acknowledged that while the provisional application contained multiple references to “stability,” all such references were deliberately removed from the common specification of the two asserted patents. As a result, the specifications of the asserted patents did not simply carry forward the language of the provisional application but instead reflected a substantive evolution.

Citing its 2024 decision in DDR Holdings, LLC v. Priceline.com LLC, the Federal Circuit emphasized that such omissions are legally significant. The Court concluded that a person of ordinary skill in the art, considering the deliberate removal of all references to stability, would not interpret the term “composition” as limited to stable formulations. Because FMC chose to revise the asserted patents’ written descriptions to exclude any mention of stability, the district court erred in importing a stability limitation from the provisional application and non-asserted patent into the claims. Accordingly, the Federal Circuit held that the district court improperly grafted a “stability” requirement onto the term “composition.”

The Federal Circuit also found fault with the district court’s [...]

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Appeal is too late to raise percolating claim construction dispute

by Sarah Mezini | Jul 17, 2025 | Patents

The US Court of Appeals for the Federal Circuit affirmed a district court’s finding of noninfringement, concluding that the patent owner had improperly raised a claim construction issue for the first time on appeal – an argument not preserved at the district court level. Egenera, Inc. v. Cisco Systems, Inc., Case No. 23-1428 (Fed. Cir. July 7, 2025) (Prost, Taranto, Stark, JJ.)

Egenera owns a patent that enhances traditional server systems by enabling a one-time physical setup followed by flexible virtual reconfiguration. The company alleged that Cisco infringed specific claims of the patent.

During claim construction, the parties disputed the interpretation of two terms: “computer processor/processor” and “emulate Ethernet functionality over the internal communication network.” The district court adopted the ordinary meaning of “computer processor,” which excluded Cisco’s unified computing system from its scope. Regarding the term “emulate,” the district court considered whether it implied an absence from the internal communication network but made no further determinations as the parties did not explicitly raise a dispute regarding the remainder of the claim term. Based on its construction of “computer processor/processor,” the district court granted Cisco’s motion for summary judgment on certain claims. Later, at trial, a jury found no infringement of other asserted claims. Egenera moved for judgment as a matter of law (JMOL) or alternatively for a new trial, both of which the district court denied. Egenera appealed the post-trial rulings and the earlier summary judgment ruling.

The Federal Circuit affirmed the district court’s grant of summary judgment. It concluded that the record lacked sufficient evidence to show that Cisco’s system “emulated” Ethernet functionality as required by the asserted claims. The Court emphasized that Egenera’s argument focused narrowly on the construction of the term “emulate,” rather than on the evidentiary record. Moreover, neither party clearly indicated that the dispute centered on unresolved claim construction rather than factual issues. The Court noted that it will not address claim construction on appeal where the issue was not preserved in the district court and was inadequately presented on appeal. As a result, the Court confined its analysis to the sufficiency of the evidence and upheld the district court’s finding of noninfringement.

The Federal Circuit also affirmed the district court’s denial of JMOL. The Court emphasized that it needed to address only one of Cisco’s proposed noninfringement grounds to determine whether substantial evidence supported the jury’s verdict. It concluded that the jury had a sufficient evidentiary basis to find that Egenera failed to prove infringement.

Finally, the Federal Circuit upheld the district court’s denial of Egenera’s motion for a new trial. It rejected all of Egenera’s arguments, which alleged errors related to jury selection, jury instructions, expert testimony, closing arguments, and a verdict contrary to the weight of the evidence.

Prosecution history primacy: “Consisting essentially of” means what applicant said it meant

by Peter Marston | Jul 10, 2025 | Life Sciences, Patents

In a decision that underscores the primacy of prosecution history to determine claim scope, the US Court of Appeals for the Federal Circuit reversed the Patent Trial & Appeal Board’s interpretation of the transitional phrase “consisting essentially of,” holding that the patentee’s actions during prosecution narrowed the claims beyond the conventional construction. Eye Therapies, LLC v. Slayback Pharma, LLC, Case No. 23-2173 (Fed. Cir. June 30, 2025) (Scarsi, Dist. J., by designation; Taranto, Stoll, JJ.)

The case involved a method for reducing eye redness using low concentrations of brimonidine, a vasoconstrictive compound. Eye Therapies owns a patent that claims methods of administering brimonidine “consisting essentially of” the active ingredient. During inter partes review (IPR), the Board applied the typical construction of that transitional phrase, allowing for the presence of other active agents as long as they did not materially affect the invention’s basic and novel properties. Based on that reading, the Board found the claims obvious over prior art references that disclosed brimonidine in combination with other drugs. On appeal, Eye Therapies argued that the Board’s construction was too broad and inconsistent with the prosecution history.

The Federal Circuit agreed. Although “consisting essentially of” is generally understood to permit unlisted ingredients that don’t materially affect the invention, the Court emphasized that this meaning can be overridden by the intrinsic record. In this case, the applicant amended the claims to avoid prior art and repeatedly argued that the invention involved only brimonidine, with no other active agents. During the original prosecution, the examiner allowed the claims on that basis. The Court found these statements to be definitional, particularly in light of the applicant’s use of “i.e.” to equate the claim language with a brimonidine-only method. Given the clarity and consistency of the applicant’s position, the Court concluded that the prosecution history required a narrower reading than the one the Board used based on the phrase’s conventional meaning.

The Federal Circuit acknowledged that the patent specification disclosed embodiments containing additional active agents. That alone, however, did not justify a broader construction. The narrowing amendment came after the specification was drafted, and the Court reiterated that not every embodiment must fall within the scope of the claims, particularly when the claims have been narrowed during prosecution. The Court also noted that other embodiments in the specification were fully consistent with the narrower interpretation. Taken together, these factors reinforced the conclusion that the applicant’s prosecution statements – not the broader illustrative disclosures – defined the proper scope of the claims.

The Federal Circuit distinguished its 2009 decision in Ecolab v. FMC, where it declined to apply prosecution history disclaimer despite similar language. In Ecolab, the patentee initially stated that peracetic acid was the “sole antimicrobial agent,” but the examiner clarified that “consisting essentially of” did not mean “solely.” The applicant never repeated the statement and secured allowance on other grounds. The specification in Ecolab also described compositions that included other known antimicrobial agents, which supported the broader interpretation. In contrast, the applicant here amended the claims, consistently [...]

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Seeing double? Director instructs Board to resolve claim construction pre-institution

by Benjamin Ediger, Ph.D. | Jul 2, 2025 | Patents

The acting director of the US Patent & Trademark Office (PTO) vacated and remanded a Patent Trial & Appeal Board decision to institute two inter partes review (IPR) petitions that challenged the same claims. The acting director determined that the two petitions primarily differed with respect to claim construction. In a decision designated as “informative,” he authorized the Board to resolve claim construction pre-institution in view of the Consolidated Trial Practice Guide’s (CTPG) direction that “one petition should be sufficient to challenge the claims of a patent in most situations.” CrowdStrike, Inc. v. GoSecure, Inc., IPR2025-00068; -00070 (PTAB June 25, 2025) (Stewart, Act. Dir.) The PTO designates a decision as informative when it provides “norms on recurring issues, guidance on issues of first impression to the Board, guidance on Board rules and practices, and guidance on issues that may develop through analysis of recurring issues in many cases.”

CrowdStrike submitted two IPR petitions that challenged the same claims of GoSecure’s patent. The Board instituted both IPRs. GoSecure requested director review, asserting that instituting both petitions was an abuse of the Board’s discretion. On review, the acting director determined that the Board abused its discretion in view of the CTPG’s direction.

The acting director concluded that the two petitions did not reflect an exception to the CTPG’s direction. He determined that CrowdStrike’s petitions were primarily distinguished by the constructions applied to a claim term. The acting director explained that the Board should have construed the term at issue prior to granting institution, concluding that the Board’s institution decision amounted to improper expansion of CrowdStrike’s permitted word count and placed a substantial and unnecessary burden on the Board and GoSecure that could raise fairness, timing, and efficiency concerns. The acting director vacated and remanded the Board’s institution decision.

The acting director also instructed the Board that the patent owner should be allowed to “submit whatever arguments are necessary for the panel to make a claim construction determination” even if the patent owner has not addressed the issue.

X-Ray Vision: Court Sees Through Implicit Claim Construction

by Connor M. Larson | Jun 5, 2025 | Patents

The US Court of Appeals for the Federal Circuit reversed the Patent Trial & Appeal Board’s final determination that challenged patent claims were not unpatentable, finding that the Board’s decision relied on an erroneous implicit claim construction. Sigray, Inc. v. Carl Zeiss X-Ray Microscopy, Inc., Case No. 23-2211 (Fed. Cir. May 23, 2025) (Dyk, Prost, JJ.; Goldberg, Chief Distr. J., sitting by designation).

Zeiss owns a patent related to X-ray imaging systems that incorporate projection magnification. Sigray filed a petition requesting inter partes review (IPR) of all claims in the patent. After institution, the Board issued its final written decision, which declined to hold any of the challenged claims unpatentable. Sigray appealed.

On appeal, Sigray argued that the claims were unpatentable based on a single prior art reference, Jorgensen. The Jorgensen reference “describes a system that uses an X-ray source to generate an X-ray beam, which then passes through a sample before being received by a detector.” Sigray argued that Jorgensen anticipated or rendered the challenged claims obvious. The parties agreed that Jorgensen explicitly disclosed all the limitations of the independent claim except for one reading “a magnification of the projection X ray stage . . . between 1 and 10 times.”

The parties’ arguments centered on whether the magnification limitation was inherently disclosed in Jorgensen. The Board concluded that “viewing the record as a whole, . . . [Sigray] has not shown persuasively that Jorgensen inherently discloses projection magnification within the claimed range. Sigray argued, and the Federal Circuit agreed, that the Board’s findings incorrectly relied on a flawed understanding of the claimed range. In Sigray’s view, “the Board implicitly and incorrectly construed the limitation ‘between 1 and 10’ to exclude unspecified, small divergence resulting in projection magnifications only slightly greater than 1.” This was illustrated by the Board’s determination that Sigray “failed to show that the . . . X-ray beam in Jorgensen diverges enough to result in projection magnification between 1 and 10 times.”

The Federal Circuit found that the Board’s use of the term “enough” indicated that the evidence it relied on supported a finding of some divergence in the X-ray beams. Because the beams were not completely parallel, the Court reasoned that some magnification necessarily resulted, and that even a miniscule amount (as disclosed in the prior art) fell within the claimed magnification range of 1 to 10. Since the Board made only one evidence-supported finding relevant to anticipation, the Court reversed on the independent claim and two dependent claims without remand. However, the Court remanded the case to the Board to determine whether the three remaining challenged claims, which recited further material limitations, would have been obvious.

“Payment Handler”: A Nonce Term Without Instructions

by Jodi Benassi | May 8, 2025 | Patents

The US Court of Appeals for the Federal Circuit affirmed a district court’s ruling that a software term was a “nonce” term that invoked 35 U.S.C. § 112, sixth paragraph (i.e., a means-plus-function claim element). The Court further found that the patent specification did not recite sufficient corresponding structure, rendering the claim element indefinite. Fintiv, Inc. v. PayPal Holdings, Inc., Case No. 23-2312 (Fed. Cir. Apr. 30, 2025) (Prost, Taranto, Stark JJ.)

Fintiv sued PayPal for infringing four patents related to cloud-based transaction systems, also known as “mobile wallet platforms,” “mobile financial services platforms,” or “electronic payment systems.” During claim construction, the district court ruled that the terms “payment handler” and “payment handler service” were indefinite. The court concluded that both terms were means-plus-function limitations governed by § 112, sixth paragraph. Although the claims did not use the word “means,” the district court found that PayPal had demonstrated that the terms were drafted in a format consistent with traditional means-plus-function language, effectively substituting “payment handler” for the word “means.” The court also found that the patent specifications failed to disclose corresponding structure capable of performing the claimed functions. As a result, the court held the claims invalid for indefiniteness and entered final judgment. Fintiv appealed.

Fintiv argued that the district court erred in concluding that the payment handler terms invoked § 112(f) and that the specifications failed to disclose the structure for the claimed functions. The Federal Circuit disagreed.

The Federal Circuit analyzed the “payment-handler” terms, which did not explicitly use the word “means.” Under § 112(f), there is a rebuttable presumption that a claim term does not invoke means-plus-function treatment unless the challenger can show that the term is a nonce term that lacks “sufficiently definite structure” or only recites a function without providing enough structure to perform that function. Fintiv contended that the payment handler terms, both individually and collectively, identified the required structure. However, the Court found that PayPal had successfully rebutted the presumption since the payment handler terms recited functions without reciting sufficient structure to perform those functions. The Court agreed with the district court that the term “handler” did not convey sufficient structure to a person of ordinary skill in the art.

Having determined that the payment handler terms invoked § 112(f), the Federal Circuit sought to identify the corresponding structure described in the specifications for performing the payment handler function but found none. The Court concluded that “without an algorithm to achieve these functionalities – and, more generally, given the specifications’ failure to disclose adequate corresponding structure – we hold the payment-handler terms indefinite.”

Prosecution Disclaimer Alive and Well, Especially in Closed Claim

by Hannah Hurley | Apr 17, 2025 | Patents

The US Court of Appeals for the Federal Circuit affirmed a district court’s noninfringement determination, finding that the presence of a disclaimed compound in the accused product precluded infringement. Azurity Pharm., Inc. v. Alkem Lab’ys Ltd., Case No. 23-1977 (Fed. Cir. Apr. 8, 2025) (Moore, Chen, Murphy, JJ.)

Azurity owns a patent directed to a nonsterile, stable liquid formulation of vancomycin hydrochloride, specifically designed for oral administration to treat Clostridium difficile infections. Following Alkem’s submission of an Abbreviated New Drug Application (ANDA), Azurity brought a Hatch-Waxman Act claim against Alkem for infringement of certain claims of the patent. The district court found that Azurity had disclaimed the presence of propylene glycol in the claimed formulation during the prosecution. Since Alkem’s ANDA product contained propylene glycol, the district court held that it did not infringe. Azurity appealed.

The Federal Circuit affirmed, focusing on the patent’s prosecution history and noting that Azurity used the lack of propylene glycol to distinguish its claimed invention from the prior art. The Court noted that this distinction was made during prosecution multiple times in response to the examiner’s rejections, and that Azurity had added negative claim limitations that specifically omitted propylene glycol from the scope of the claims.

The Federal Circuit also noted that Azurity used a “consisting of” transitional phrase to narrow the claims and relied on the closed transition to overcome the prior art. The Court explained that “consisting of” is a closed transition that limits the claim scope to only the recited components. By using this transition and not including propylene glycol as one of the claim components, Azurity effectively disclaimed propylene glycol from the invention. Therefore, the Court found that omission of propylene glycol during patent prosecution was “clean, unambiguous, and complete.”

Azurity argued that a pretrial stipulation between the parties, which stated that “[s]uitable flavoring agents for use in the asserted claims include flavoring agents with or without propylene glycol,” should preclude the application of the disclaimer. The Federal Circuit did not find this argument persuasive, concluding that the stipulation did not alter the clear and unambiguous disclaimer made during prosecution, nor did it affect the noninfringement finding. Since Alkem’s ANDA product contained propylene glycol and Azurity disclaimed inclusion of propylene glycol, there was no infringement.

The Clear and Unmistakable Standard for Applying Prosecution Disclaimer

by Sarah Mezini | Apr 3, 2025 | Patents

The US Court of Appeals for the Federal Circuit found that a district court misconstrued claim terms based on a misapplication of the clear and unequivocal disavowal standard and vacated its noninfringement decision. Maquet Cardiovascular LLC v. Abiomed Inc., Abiomed R&D, Inc., Abiomed Europe GMBH, Case No. 23-2045 (Fed. Cir. Mar. 21, 2025) (Reyna, Taranto, Cunningham, JJ.)

Maquet owns a patent related to a system that provides greater precision in deploying a blood pump to a patient’s circulatory system. The district court construed three patent terms. The district court construed the term “guide mechanism comprising a lumen” to include a negative limitation that the guidewire lumen “is not distal to the cannula.” The court justified this limitation by citing to the prosecution history of a related patent where Maquet disclaimed the broader claim by merely accepting the examiner’s proposed revisions. The district court also construed both guide wire terms in two other claims to include another negative limitation: “the guide wire does not extend through the free space in between the rotor blades.” The district court similarly justified this negative limitation by citing to the parent patent’s prosecution history, finding that Maquet had given up a broader version of the claim. The district court’s construction effectively limited the scope of Maquet’s claims to exclude the accused products, and the parties stipulated to the entry of a final appealable judgment of noninfringement. Maquet appealed.

Maquet argued that the district court erred in its construction of the three terms by misapplying the law of prosecution disclaimer. The Federal Circuit agreed, finding that the district court incorrectly relied on Maquet’s prosecution history to reach its conclusions on claim construction. The district court cited to an amendment made in a different (but related) patent prosecution and a different claim. The Federal Circuit explained that although the prosecution history of a related patent may be relevant, the claim limitations in the two applications must be similar in order for the prosecution disclaimer doctrine to apply. Here, the Court found that the amendment in the related patent was not sufficiently similar to the limitation at issue to constitute a disclaimer for the claim at issue. The related case claim did not claim a guide mechanism, nor did it require the lumen be in a specific position. The Federal Circuit found that the district court erred in its construction by improperly applying prosecution disclaimer.

The Federal Circuit also determined that the district court erred in its construction of the guide wire claim terms by applying prosecution disclaimer and interpreting a restriction on their scope. The Court found that while the prosecution history of the parent patent’s claims was sufficiently similar and thus relevant, Maquet did not disavow either claim’s scope during the relevant prosecution. The Court noted that mere silence in response to a notice of allowance typically does not rise to clear and unmistakable claim disavowal. The Court also observed that statements made during an inter partes review (IPR) proceeding may be used to support a [...]

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Get a Grip: Not All Cords Have Handles

by Dexter Hamilton | Mar 20, 2025 | Patents

The US Court of Appeals for the Federal Circuit vacated a district court’s grant of summary judgment of noninfringement because the district court improperly narrowed a claim term during its construction. IQRIS Technologies LLC v. Point Blank Enterprises, Inc. et al., Case No. 2023-2062 (Fed. Cir. Mar. 7, 2025) (Lourie, Linn, Stoll, JJ.)

IQRIS sued Point Black and National Molding for infringing its patents related to “quick release systems on tactical vests.” The patent claim vests include a “pull cord.” When pulled, the pull cord causes releasable hooks to disengage, detaching the front and rear portions of the vest. The defendants moved for summary judgment of noninfringement, arguing that the claimed “pull cord” is “a cord on the exterior of the ballistic garment grasped by a user that is capable of disengaging the releasable fastener or releasable hook when a user pulls on the pull cord.” IQRIS argued that the term should be construed as “a component which, when put into tension, can result in activating the releasable fastener.”

The district court construed “pull cord” as a “cord that can be directly pulled by a user to disengage a releasable fastener or releasable hook,” a construction that excluded cords with a handle. The district court found that one of the accused products featured a “trigger manifold” that enabled the user to apply “indirect force to [an] internal wire by applying a direct force to the trigger.” As a result, the district court determined that no reasonable jury could find infringement for that product. For another product, the district court found summary judgment to be appropriate because to rule otherwise, the accused vest would improperly encompass prior art criticized in the “background of the invention” portion of the patent specification. The specification criticized prior art having “cutaway vests with ‘handle’ release systems.”

IQRIS appealed. The Federal Circuit considered whether the district court correctly restricted “pull cord” to cords that are “directly pulled by a user.” The Court found that the claim language, which made no reference to “who or what pulls,” did not distinguish between direct and indirect pulling. Citing the patent specification, the Federal Circuit disagreed with the lower court’s interpretation, noting that the specification referred to a directly pulled element as a “pull cord” but an indirectly pulled element as just a “cord.” The Court noted that even though all disclosed embodiments depicted a directly pulled pull cord, “our precedent counsels against reading this requirement into the claims when the claims do not expressly require as much.”

The Federal Circuit next considered whether the proper construction of the term “pull cord” excluded cords with handles. The Court found that “nothing in the claim language, specification, or prosecution history supports this construction.” The claim language was “silent about the structure of the pull cord,” and the specification “suggest[ed] otherwise because each of the figures depicts a circular ball at the end of the pull cord[], suggesting that the inventors contemplated pull cords with handles.” While the specification criticized the cutaway [...]

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Construing Unambiguous Claim Language and Qualifying Challenged Expert as POSITA

by Taylor MacDonald | Mar 20, 2025 | Patents

Addressing the issues of claim construction and the requisite expert qualifications to testify on obviousness and anticipation, the US Court of Appeals for the Federal Circuit vacated a Patent Trial & Appeal Board decision invalidating half of the challenged patent’s claims and instructed the Board to clarify whether the patent owner’s expert was indeed qualified as a person of ordinary skill in the art (POSITA). Sierra Wireless, ULC v. Sisvel S.P.A., Case Nos. 23-1059; -1085; -1089; -1125 (Fed. Cir. Mar. 10, 2025) (Moore, CJ: Schall, Taranto, JJ.)

Sisvel owns a patent directed to methods for retrieving data lost during wireless transmission. The prior art taught methods for flagging lost protocol data units (PDUs) so that the data transmitter could retry the transmission. Sisvel’s patent includes a timer that prescribes a period of time to elapse before alerting a transmitter of a missing PDU, allowing the transmission to be completed without notification. The patent has 10 claims, two of which are independent. The primary independent claim has four limitations, including one related to stopping the timer before a status report issues if the missing PDU is located and another related to issuing a status report upon the timer’s expiration. The limitations are linked by the word “and.”

Sierra Wireless initiated inter partes review (IPR), arguing that all 10 of the claims were both anticipated and obvious in light of the “Sachs” prior art patent. The Board found that half of the claims, including both independent claims, were anticipated and obvious. In finding that the other claims were not unpatentable, the Board relied on the testimony of Sisvel’s expert. Both parties appealed.

Sisvel raised two arguments in support of the claims the Board found unpatentable. First, Sisvel argued that the Board misconstrued the two above-noted limitations as mutually exclusive. Sisvel argued that the prior art had to teach both limitations to invalidate the claim. Second, Sisvel argued that the Board’s interpretation of Sachs’ teachings to include the first of the two limitations was unsupported by substantial evidence.

The Federal Circuit agreed. On the claim construction issue, the Court found that the two limitations in issue could not be mutually exclusive because the claim language linked them using the word “and.” To construe the limitations as mutually exclusive would be inconsistent with the unambiguous claim language. With regard to the prior art, the Court looked to Sachs Figure 5, which the Board relied upon in determining that the prior patent had taught the first limitation. Both the figure and the patent’s surrounding language made clear that the time referenced therein was dependent upon reordering of PDUs, not upon receiving missing ones. The Court thus vacated the Board’s invalidity determination as not supported by substantial evidence.

In its appeal, Sierra argued that the Board’s reliance on Sisvel’s expert’s testimony to find certain claims not unpatentable was an abuse of discretion. The Federal Circuit agreed, finding that the Board abused its discretion by not finding that the proposed expert qualified as a POSITA before relying [...]

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