Federal Circuit Reaffirms Dynamic Drinkware for AIA Prior Art

The US Court of Appeals for the Federal Circuit confirmed that the America Invents Act did not change the requirements for when a patent or published application can rely on the date of an earlier provisional application or foreign filing as establishing the prior art reference’s effective date. The ruling means parties in patent challenges and litigation must still show that the provisional application or foreign filing provides the written description support required under Section 112(a) before relying on that earlier date.

The Federal Circuit’s recent decision in Dental Monitoring SAS v. Align Technology, Inc. affirmed that the America Invents Act (AIA) did not alter long-standing precedent requiring that, for a patent or published application to qualify as prior art as of the filing date of a provisional application to which it claims priority, the provisional application provide written description support for at least one published claim of the reference. The Federal Circuit emphasized that written description support under Section 112(a) is essential for a reference to obtain the provisional filing date for prior-art purposes, and the AIA did not change this requirement despite US Patent and Trademark Office (USPTO) decisions finding otherwise.

This decision confirms that patent owners and petitioners involved in inter partes review (IPR) proceedings must continue to apply the Dynamic Drinkware framework where prior art status hinges on a provisional or earlier application filing, and that the substantive standard remains in effect. The decision also confirms that the long-standing precedent in district court litigation has not been altered by the AIA, and that parties must develop the substantive Section 112(a) analysis through fact and expert discovery in order to preserve an argument that a reference patent or application qualifies for an earlier effective date.

KEY TAKEAWAYS

• The Federal Circuit rejected the Patent Trial and Appeal Board’s (PTAB’s) “ministerial” approach to determining an earlier effective prior-art date, holding that a reference seeking the benefit of an earlier filing date under AIA Section 102(d)(2) must satisfy the substantive written description requirements of Section 112(a).
• The decision reaffirms the long-standing Federal Circuit and district court practice of following the substantive priority principles of Dynamic Drinkware in AIA prior art determinations, confirming the continued application of the substantive standard rather than establishing a new one for post-AIA references in matters before the USPTO, and confirming that USPTO practice must remain aligned with Federal Circuit and district court practice.
• Practitioners should develop the necessary written description evidence at the appropriate stage: petitioners should make the required showing in an IPR petition, while district court litigants must develop this issue during fact and expert discovery. Failure to preserve these arguments in a petition, or during discovery, respectively, risks waiving the ability to seek an earlier effective prior art date.

THE PRIOR ART DISPUTE BEFORE THE PTAB

Dental Monitoring SAS owns US Patent No. 10,755,409 (the ’409 Patent), which is directed to methods for acquiring and analyzing images of a patient’s dental arch using a deep learning device. Align Technology, Inc. filed an IPR petition challenging claims 1–15 of the ’409 Patent as obvious based on a combination of three prior art references, including US Patent Application Publication No. 2021/0068923 (Carrier). The PTAB ultimately determined that the challenged claims were unpatentable as obvious.

Whether Carrier qualified as prior art, however, depended on the effective filing date it could receive. The ’409 Patent’s effective filing date fell after Carrier’s provisional application was filed but before Carrier’s nonprovisional application was filed. Thus, Carrier could qualify as prior art only if it was entitled to the earlier filing date of its provisional application under Section 102(d)(2).

Dental Monitoring argued that, under Dynamic Drinkware, Carrier could rely on its provisional filing date only if the provisional application provided written description support under Section 112(a). The PTAB rejected that argument based on its precedential decision in Penumbra Inc. v. RapidPulse, Inc., concluding that Dynamic Drinkware’s written description analysis applied only under pre-AIA law.

Applying Penumbra, the PTAB concluded that Carrier could receive the provisional application’s filing date by satisfying the “ministerial requirements” of Sections 119 and 120, so long as the provisional application described the subject matter relied upon as prior art. Because the PTAB found that Carrier’s provisional application described the relied-upon subject matter, it treated Carrier as prior art as of the provisional filing date.

Dental Monitoring appealed and challenged the application of the Penumbra framework. Dental Monitoring argued—based on Dynamic Drinkware—that substantive written description support under Section 112(a) is necessary for a reference to receive an earlier effective filing date under Section 102(d)(2).

FEDERAL CIRCUIT’S HOLDING AND REJECTION OF PENUMBRA REASONING

The Federal Circuit vacated the PTAB’s decision and expressly rejected the Board’s Penumbra reasoning, holding that the plain statutory language of Section 102(d)(2) “expressly conditions entitlement to priority on satisfaction of Section 112’s written description requirement” and that nothing in the text creates a different, less demanding “ministerial” standard for prior art purposes. The phrase “entitled to claim a right of priority” in Section 102(d)(2) refers to substantive entitlement under Section 119—not merely the act of making a procedural claim.

The Federal Circuit further clarified that the rationale of Dynamic Drinkware remains applicable under the AIA and reaffirmed that the concern in Dynamic Drinkware—that a patent challenger should not backdate prior art by claiming priority from an earlier application that would not support a patent on the claimed invention—remains valid post-AIA.

Specifically, the AIA did not change the law on this issue and did not alter the principle that a reference can receive the benefit of an earlier filing date for prior-art purposes only if the earlier application both discloses the subject matter relied on as prior art and provides Section 112(a) written description support for at least one published claim of the reference.

Accordingly, consistent with pre-AIA practice, a prior art reference must have Section 112(a) written description support for at least one of its published claims to obtain the benefit of an earlier filing date for prior art purposes. Because the PTAB had not made that determination for Carrier’s provisional application, the Federal Circuit vacated the decision and remanded for further proceedings.

IMPLICATIONS

This decision has practical implications for parties involved in IPRs and district court litigation where prior art status may hinge on a provisional or earlier filing date. Petitioners seeking to rely on a reference’s provisional date must continue to marshal substantive evidence showing that the provisional application provides written description support under Section 112(a) for at least one claim of the reference patent. Petitioners should make that showing in the petition.

In district court, parties seeking to rely on an earlier priority date should likewise continue to apply the Dynamic Drinkware framework and develop the factual and expert record necessary to establish the required written description support. Failure to do so may result in loss of the earlier date and inability to qualify a reference as prior art.

Patent owners should scrutinize assertions of prior art status based on provisional filings that are merely supported by the “ministerial” requirements and should consider, where applicable, challenging the sufficiency of written description support as a defense strategy. The requirement to demonstrate written description support is substantive rather than merely procedural.

Practically, this continued application of the substantive standard may increase the complexity and evidentiary demands of IPR proceedings and district court litigation, especially in cases involving references with lengthy or ambiguous provisional disclosures.

CONCLUSION

The Federal Circuit’s decision reaffirmed its long-standing precedent and the necessity of substantive written description support for establishing an earlier effective prior-art date under the AIA, confirmed that the AIA did not change this substantive requirement, and expressly rejected the PTAB’s attempt to change the standard to “ministerial” only, as in Penumbra.