Is Your Provisional Patent Application Strong Enough? What Dental Monitoring v. Align Means for Startups

Ask most founders why they filed a provisional patent application and you will hear some version of: to lock in a date cheaply while we figure out the product. That is a reasonable instinct. A US provisional is inexpensive, informal, and buys twelve months before a full application is due. But it has always carried a trap — and a Federal Circuit decision from August 2026 makes that trap bigger.

In Dental Monitoring SAS v. Align Technology, Inc. (decided August 10, 2026), the court held that a provisional application does not automatically give a later patent or publication an early prior-art date. The provisional has to actually support what the later document claims. The decision changes how you should think about provisionals — not just as protection for your own invention, but as a weapon against competitors who file after you.

What happened in the case

Dental Monitoring owns a patent on a deep-learning method for analysing images of a patient’s dental arch. Align challenged it at the Patent Trial and Appeal Board (PTAB), relying on a published patent application referred to as Carrier. The timing was the whole case: Carrier’s non-provisional application was filed after Dental Monitoring’s patent, but it claimed priority to a provisional filed before. Carrier only counted as prior art if it was entitled to that earlier provisional date.

The Board said yes, because the Carrier provisional described the subject matter Align relied on. In effect, it treated priority as a box-ticking exercise. The Federal Circuit vacated that decision and sent the case back.

The holding in plain English

The court extended the rule from its 2015 Dynamic Drinkware decision, which applied under the pre-AIA statute, to the current America Invents Act framework, holding that the AIA’s prior-art provision incorporates the substantive written-description requirement of 35 U.S.C. Section 112(a). It rejected the argument that the AIA had replaced that requirement with a looser, ministerial test. Whether the Carrier provisional actually supports one of its claims is now a factual question for the Board on remand.

Why this matters: the double-exposure problem

Founders usually think about a provisional in one direction: protecting the priority date of their own patent. That has long required the provisional to support the later claims. Dental Monitoring confirms a second job the provisional does — and the price of a thin one.

Job 1: protecting your own priority (defensive)

If your provisional does not adequately describe what you eventually claim, your non-provisional cannot rely on the earlier date for those claims. Anything published or filed by others in the gap — including your own product launch or pitch-deck disclosures — may then count against you.

Job 2: blocking competitors (offensive)

A well-drafted provisional also makes your eventual publication prior art against anyone who files after your provisional date. That is one of the most valuable things a startup can do in a crowded field: close the door on fast followers for the full twelve-month window. After Dental Monitoring, that blocking effect only works if your provisional supports at least one claim in your later application. A rough provisional may leave your publication counting as prior art only from the non-provisional date — and a competitor who filed in between keeps their patent.

What about foreign priority?

Dental Monitoring involved a US provisional. Many international companies rely instead on a foreign first filing — a UK, German, Japanese, or Korean application, or a PCT — to establish an early date for their US filings and publications. Commentators have noted that the court’s reasoning strongly suggests the same claim-support requirement would apply when a reference relies on a foreign priority application for its prior-art date, though the court did not decide that question.

Foreign first filings are often more complete than US provisionals, so the risk tends to be lower. But for cross-border businesses whose first filing is a quick placeholder in their home office, the same discipline applies. Your global filing strategy should treat the first filing anywhere as the foundation for both priority and prior-art effect.

What to change in your filing practice

1. Write provisionals like real applications. Include a detailed description, figures, multiple embodiments, and the technical problem and solution. The more it reads like a non-provisional, the safer you are.
2. Include at least one set of claims, or claim-like statements. Claims are not required in a provisional, but drafting them forces you to describe what you will eventually claim and makes support easier to show.
3. Avoid deck-only filings. Filing an investor deck or a marketing summary as a provisional is cheap but now carries a higher hidden cost on both priority and prior-art effect.
4. File follow-up provisionals as the invention develops. If the product evolves during the twelve months, capture new embodiments in additional provisionals rather than hoping the first one stretches to cover them.
5. Check support before converting. Before filing the non-provisional, map each intended claim back to the provisional so you know which claims enjoy the early date.
6. Audit your competitors’ references too. When a competitor’s publication is cited against you through a provisional date, check whether that provisional actually supports one of its claims. Dental Monitoring gives you a new line of attack.

The founder’s quick-check

• ☐  Does our provisional describe how the invention works in enough detail for an engineer to build it?
• ☐  Does it cover the version of the product we are actually launching, not just the original concept?
• ☐  Would at least one of our planned claims find clear support in it?
• ☐  Have we filed updated provisionals for significant changes since the first filing?
• ☐  Are our foreign first filings detailed enough to support US claims and publications?
• ☐  Are we checking prior art cited against us for weak provisional support?

For startups approaching a Series A or B, these questions also matter in diligence. Investors increasingly look beyond the number of filings to the quality of the priority chain, as we discuss in The State of US IP Strategy in 2026. And if your product relies on software or AI, pair a robust provisional with the eligibility strategy described in our guide to Section 101 rejections and SMEDs.

The bottom line

Dental Monitoring v. Align closes a gap that many filers did not know they were relying on. A provisional’s early date is only as good as its content — for your own patent and for the prior-art shadow your filings cast over competitors. The fix is not expensive: invest a little more in the first filing, update it as the product evolves, and check support before you convert. If you would like a review of your provisional and priority strategy, US or international, that is a fast, high-value engagement we run for founders regularly.

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Disclaimer: This article provides general information about IP strategy and should not be relied upon as legal advice. IP laws vary significantly by jurisdiction and every business situation is unique. Consult qualified counsel about your specific circumstances.