Introduction
On August 10, 2026, the Federal Circuit vacated and remanded a Patent Trial and Appeal Board (“PTAB”) decision that had invalidated all challenged claims of Dental Monitoring SAS’s U.S. Patent No. 10,755,409 (“the ‘409 patent”) in an inter partes review brought by Align Technology, Inc. It held that a reference patent or published application cannot claim the benefit of an earlier provisional filing date for prior art purposes under AIA 35 U.S.C. § 102(d)(2) unless the provisional application actually satisfies the written description requirement of § 112(a) for at least one claim of the later-filed application. In doing so, the court rejected the PTAB’s position, following in its own precedent, that only “ministerial” compliance with the priority-claiming formalities of §§ 119 and 120 is required. The case effectively extends the pre-AIA rule of Dynamic Drinkware, LLC v. National Graphics, Inc. into the AIA framework.
Background
Align Technology challenged claims 1–15 of Dental Monitoring’s ‘409 patent in an inter partes review. The PTAB found the claims obvious over a combination of three references, including a patent publication referred to as “Carrier.”
Carrier’s status as prior art depended on whether it could receive the filing date of its provisional application, because that provisional was filed before the effective filing date of the ‘409 patent, while Carrier’s non-provisional application was filed afterward.
Dental Monitoring argued that, under Dynamic Drinkware, Carrier could receive the benefit of its provisional filing date only if the provisional provided written-description support for at least one claim of Carrier. Align argued that Dynamic Drinkware was limited to pre-AIA law and that, under the PTAB’s precedential decision in Penumbra Inc. v. RapidPulse, Inc., the provisional need only disclose the subject matter relied upon as prior art and satisfy the applicable “ministerial” priority requirements.
The PTAB agreed with Align and treated Carrier as prior art as of the provisional filing date.
Federal Circuit’s Decision
The Federal Circuit reviewed the PTAB’s legal conclusions de novo and vacated. The Federal Circuit grounded its decision in the statutory text of § 102(d)(2), which provides a reference with an earlier effective filing date only if the reference “is entitled to claim a right of priority under [§] 119.” Section 119(e)(1) in turn requires that the invention be “disclosed in the manner provided by [§] 112(a).” Reading these provisions together, the court held that § 102(d)(2) incorporates § 112(a)’s written description requirement, and that the phrase “entitled to claim a right of priority” denotes substantive entitlement, not the mere procedural act of claiming priority.
The panel rejected both of Align’s arguments for the PTAB’s contrary reading. First, it characterized Dynamic Drinkware’s footnote reserving the AIA § 102(d) question as a reservation of decision, not a determination that the AIA abandoned the written description requirement. In addition, the Federal Circuit noted that the policy concern Dynamic Drinkware addressed, namely preventing a challenger from manufacturing an artificially early prior art date, remains equally valid under the AIA. Second, the court held that the AIA’s structural distinction between a claimed invention’s effective filing date (§ 100(i)) and a reference’s effective prior art date (§ 102(d)) says nothing about what substantive showing “entitled to claim” priority requires, rather it merely identifies which inquiry is being performed. The court also declined to credit legislative statements suggesting a “ministerial” standard, reiterating that unambiguous statutory text controls over extrinsic legislative history.
Notably, the court observed in a footnote that the PTAB’s own Penumbra decision, the precedent underlying its “ministerial” standard, had been affirmed by the Federal Circuit only under Rule 36, without opinion, and therefore carries no precedential weight of its own. A Rule 36 affirmance only establishes that the judgment was correct. It does not endorse or reject the underlying reasoning for the judgment.
Because the PTAB had not made factual findings on whether Carrier’s provisional application actually provides § 112(a) written description support for any claim of Carrier, the court vacated and remanded the decision for the PTAB to make that determination in the first instance.
Conclusion
Dental Monitoring v. Align Technology supplies precedential clarity on a question the PTAB had answered inconsistently in the years since the AIA: a reference cannot borrow an earlier provisional filing date for prior art purposes under § 102(d)(2) without satisfying § 112(a)’s written description requirement for at least one claim of the reference. Practitioners should take note of several practical implications:
- IPR petitioners relying on a reference’s provisional priority date to establish an earlier effective filing date should be prepared to show that the provisional application provides written description support for at least one claim of the reference patent or application.
- Patent owners facing prior art references that depend on an earlier provisional filing date now have a clearer, precedential basis to challenge that date by attacking the provisional’s written description sufficiency, mirroring pre-AIA Dynamic Drinkware practice.
- The decision also serves as a reminder that Rule 36 affirmances carry no precedential force. The PTAB’s reliance on Penumbra as settled law was itself vulnerable, and parties should scrutinize whether PTAB precedent rests on non-precedential appellate outcomes before treating it as settled.