The Federal Circuit decided Dental Monitoring SAS v. Align Technology, Inc. last month, holding that a cited U.S. patent or published application is not entitled to the filing date of its provisional as a prior art date unless the provisional provides written description support under 35 U.S.C. § 112(a) for at least one of the reference's published claims. Showing that the provisional describes the subject matter relied on as prior art, which is what the Board had required, is necessary but not sufficient.
That requirement decides whether a cited document predates the application under review. It mattered here because the effective filing date of the challenged patent "fell between the filing date of Carrier's provisional application and the filing date of Carrier's non-provisional application." Carrier, one of the cited references, therefore qualified as prior art only if 35 U.S.C. § 102(d)(2) treated it as effectively filed on the provisional filing date.
Where the MPEP and a recent decision diverge, Solve Intelligence's Assistant flags the conflict rather than repeating the manual.
Dental Monitoring owns U.S. Patent 10,755,409, directed to acquiring and analyzing an image of a dental arch. Align petitioned for inter partes review (IPR). The Board held challenged claims 1–15 unpatentable as obvious over three references, including U.S. Patent Application Publication No. 2021/0068923 to Carrier (“Carrier”).
Following its precedential decision in Penumbra v. RapidPulse, the Board held that a reference receives an earlier application’s filing date as its prior art date if it satisfies the “ministerial requirements” of 35 U.S.C. §§ 119 and 120 and the earlier application “describes the subject matter relied upon in the reference patent.” The Board found that Carrier’s provisional described the relied-on subject matter and treated Carrier as prior art from the provisional filing date.
The Federal Circuit began with the statutory text. 35 U.S.C. § 102(d)(2) gives a patent or published application an earlier prior art date only if it “is entitled to claim a right of priority under section 119 … or to claim the benefit of an earlier filing date under section 120.” 35 U.S.C. § 119(e)(1) in turn gives a later-filed application the benefit of a provisional application’s filing date only for “an invention disclosed in the manner provided by section 112(a) (other than the requirement to disclose the best mode).” The court held that these provisions condition the earlier prior art date on compliance with the written description requirement of 35 U.S.C. § 112(a).
The court also explained that the phrase “entitled to claim a right of priority” in § 102(d)(2) must be given independent effect. It refers to substantive entitlement under 35 U.S.C. § 119, not merely the procedural act of claiming or asserting priority. Reading it otherwise would render “entitled to” superfluous.
The court held that “to establish Carrier as prior art to the ’409 patent, Align must show that Carrier’s provisional application provides written description support for at least one claim of Carrier.” The Board had not made that finding, so the court vacated and remanded.
The opinion expressly identifies the issue as the use of Carrier’s provisional filing date to establish earlier prior art. It states that “the relevance of the Carrier provisional application date here is not to give the Carrier patent any earlier priority over a competing application or patent, but to serve Align’s goal of creating earlier prior art against the ’409 patent.”
The court made the same distinction when it rejected Align’s reliance on 35 U.S.C. § 100(i): “Section 100(i) determines what effective filing date for a claimed invention means; it does not alter the requirements for determining when a reference is entitled to an earlier effective filing date under § 102(d).” The effective filing date of an applicant’s own claimed invention is therefore a separate statutory inquiry.
Within the reference-date analysis, two questions remain distinct.
The Board had answered the second question in the affirmative but had not made the written description finding the first requires. The Federal Circuit did not address whether the claim supported for the first question must recite the same subject matter relied on as prior art.
MPEP § 2154.01(b) still tells examiners that a reference “need only meet the ‘ministerial requirements’” of 35 U.S.C. §§ 119 and 120, and says the Dynamic Drinkware requirement “does not apply to AIA 35 U.S.C. § 102(d).” That language conflicts with Dental Monitoring. Examiners work from the MPEP, so until the Office revises that section, the manual itself still points to the older standard.
A response should therefore cite the decision directly and, when entitlement is disputed, identify the written description finding it requires; that places the controlling authority in the record rather than leaving the question to the manual.
The required showing matters in practice. In this IPR, the Federal Circuit said that “Align must show” written description support for at least one Carrier claim. Because the Board had not made that factual finding, the court vacated and remanded. A claimed priority date by itself therefore does not establish the provisional filing date as the reference’s prior art date.
The first step is knowing the current state of the law. Solve Intelligence’s Assistant can research U.S. patent law questions with citations to the statute, the MPEP, and court decisions, and can flag where an MPEP passage conflicts with more recent case law, as MPEP § 2154.01(b) now conflicts with Dental Monitoring.
When a 35 U.S.C. § 102 or § 103 rejection depends on a cited reference’s provisional filing date, Solve Intelligence’s Prosecution module can put the date analysis before teaching or amendment arguments. It can identify the date used by the Office, retrieve the provisional, and assess whether the provisional supports at least one published claim and describes the specific disclosure cited in the rejection.
If the record does not support the asserted date, Solve Intelligence can draft a response explaining why the reference is not entitled to it. A successful challenge removes the provisional date; the reference then falls back to its actual filing date, or to its publication date under 35 U.S.C. § 102(a)(1), and remains available only if one of those dates still precedes the effective filing date of the claim at issue.
For work involving many cited references, Solve’s Charts product can structure an invalidity analysis around the two 35 U.S.C. § 102(d)(2) questions. For each reference, one field can record whether the provisional supports at least one published claim of the reference. Another can record whether the provisional describes the specific passage or figure being used as prior art. The chart can cite the published claim language and provisional passages supporting each conclusion so the practitioner can efficiently verify them.
A 35 U.S.C. § 112(a) review is also useful before filing a provisional application. Practitioners can use Solve’s Drafting module to review the draft against the intended claim scope and identify possible written description or enablement gaps. Addressing those gaps before filing can reduce the risk that later claims will not receive the benefit of the provisional filing date.
Charts can also support a separate analysis of an applicant’s own priority chain. For each claim or proposed claim, its limitations can be mapped to each earlier application to determine the earliest filing date supported under 35 U.S.C. § 100(i) and the applicable priority or benefit provisions, including 35 U.S.C. §§ 119 and 120. That analysis concerns the effective filing date of the applicant’s own claimed invention, not the reference-date inquiry decided in Dental Monitoring.
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What did the Federal Circuit decide in Dental Monitoring v. Align?
A U.S. patent or published application cannot use a provisional filing date as its prior art date under AIA 35 U.S.C. § 102(d)(2) unless the provisional provides written description support for at least one of the document’s published claims. A finding that the provisional describes the relied-on subject matter is also required, but it is not sufficient by itself. The Federal Circuit vacated and remanded because the Board had not made the claim-support finding.
Does this apply to my own claims as well as to cited references?
Not directly. The holding addresses whether a cited patent document is prior art from an earlier date under 35 U.S.C. § 102(d). The effective filing date of an applicant’s own claimed invention is governed by 35 U.S.C. § 100(i)(1) and the applicable priority or benefit statute. Both analyses may require 35 U.S.C. § 112(a) support, but they are distinct statutory inquiries.
What must be checked when a cited reference relies on a provisional filing date?
At minimum, check two disclosure issues separately. First, the provisional must provide 35 U.S.C. § 112(a) written description support for at least one published claim of the reference, as required for substantive entitlement under 35 U.S.C. § 119(e). Second, the provisional must describe the specific subject matter being used as prior art, as 35 U.S.C. § 102(d)(2) separately requires. A priority claim or a finding on the second issue alone is not enough, and other § 119(e) requirements may also apply.
Will examiners apply this now?
The decision is precedential and binding on the Office, but MPEP § 2154.01(b) has not yet been revised to reflect it. Until it is, the most reliable course is to cite Dental Monitoring directly, explain its effect, and identify the written description finding required for the provisional filing date.
Does the EPO apply the same test?
No. The EPO asks whether the specific subject matter relied on is itself entitled to priority for an earlier-filed European application to serve as novelty-only prior art under Article 54(3) EPC as of its priority date. It must be directly and unambiguously derivable from the priority application. There is no separate requirement that the priority application supports a claim of the later publication. Because the two frameworks are structured differently, parallel US and European proceedings can reach different conclusions about the same reference. For an early practitioner comparison of the two approaches, see this LinkedIn discussion.
