Filing a U.S. Provisional Before a Trade Show—Are You Really Covered?

Introduction

A medical-device startup in Suzhou is heading to a U.S. trade show next month. The CTO heard from peers that the United States has a “provisional application”: no claims required, fees are modest, and filing one supposedly locks in a filing date. He asked us: should we file a U.S. provisional first, then take our time with formal Chinese and U.S. applications?

The question looks simple. It hides three layers: what tool actually “stakes the date,” how much ground that stake covers, and whether an invention completed in China can be filed first in the United States at all.

Many people treat Chinese priority and the U.S. provisional as the same thing. Both do involve “file something first, then complete within twelve months.” Where the bar sits—and how much you must write on day one—differs a great deal. This article puts the two side by side, then returns to the confidentiality examination Chinese applicants cannot skip.

1. On the surface: the two tools look alike

In China, locking a filing date rests on priority. Article 29 of the Patent Law of the People’s Republic of China (2020 Amendment; “Patent Law”) provides for foreign and domestic priority: within twelve months of a first invention or utility-model filing (six months for designs), a later application on the same subject matter may claim priority.

In the United States, besides Paris Convention priority under 35 U.S.C. 119(a), there is an extra tool: the provisional application under 35 U.S.C. 111(b). Its most attractive feature is that claims are not required (111(b)(2)). It also has a shelf life—within twelve months a nonprovisional must be filed claiming the benefit of the provisional, or the provisional is regarded as abandoned and cannot be revived after that period (111(b)(5)).

Both sides, then, are “file first, complete within twelve months.” That is why many treat them as the same instrument.

2. Dig deeper: three real differences

What the staking document actually is

China has no “provisional” filing type. An earlier application used as the basis for domestic priority is itself a formal invention or utility-model application. Once the later application is filed, the earlier one yields—Implementing Regulations of the Patent Law (2023 Revision; “Regulations”) Article 35(3): where domestic priority is claimed, the earlier application is deemed withdrawn as of the later filing date (except where a design claims priority from an invention or utility model).

A U.S. provisional is only a “date container”: it is not examined; it waits for a later nonprovisional to claim it. Think of China’s earlier application as a full ticket you must surrender when you transfer; the U.S. provisional is more like a platform ticket—it gets you onto the platform, not onto the train.

How much ground is staked: what was written in

Neither system cares how many pages you filed. Both ask whether what you later want to protect was already disclosed.

China’s standard is “same subject matter.” Guidelines for Patent Examination (2023), Part II, Chapter 3, Section 4.1.2: same technical field, problem solved, technical solution, and expected effect—without requiring identical wording.

For U.S. provisionals, 35 U.S.C. 119(e)(1) requires that the invention be disclosed in the provisional in the manner provided by section 112(a) (other than best mode). Written description and enablement still apply. Skipping claims does not discount the specification.

If something goes wrong, can you fix it?

China’s 2023 Regulations added several safety valves: with justified reasons, priority restoration may be requested within two months after the Article 29 deadline (Regulations Art. 36); priority claims may be added or corrected within sixteen months from the priority date or four months from the filing date (Art. 37); missing or incorrect content may, where priority was claimed on the filing date, be supplied by reference to the earlier application within the prescribed period (Art. 45).

The United States has parallels. Under 35 U.S.C. 119(a) and 119(e)(1), the twelve-month period may be extended by two months for unintentional delay. Procedurally, 37 CFR 1.78(a)(4) requires that a claim to a provisional in a 111(a) application be made within four months of the actual filing date or sixteen months of the provisional filing date, whichever is later.

One often overlooked point is patent term. Under 35 U.S.C. 154(a)(2)–(3), the twenty-year term runs from the U.S. filing date; priority under section 119 does not count against the term—the provisional year does not consume patent life. In China, Article 42 measures term from the filing date; Regulations Article 12(1) excludes Article 42 from the rule that “filing date” means priority date, so with priority claimed, term still runs from the actual filing date.

3. The step Chinese companies cannot skip: confidentiality examination

Back to the CTO’s idea: invent in Suzhou, file a U.S. provisional first. Chinese law is clear.

Patent Law Article 19(1): any entity or individual filing abroad for an invention or utility model completed in China must first request confidentiality examination by the patent administration department under the State Council. Regulations Article 8(2)(i) further requires a prior request with a detailed technical description when filing directly abroad.

What if you skip it? Article 19(4): inventions or utility models filed abroad in violation of paragraph 1 shall not be granted a patent in China. A U.S. provisional is still “filing abroad.” Skipping the step trades the China market for a U.S. filing date.

4. Side-by-side: Chinese priority vs. U.S. provisional

Legal basis

• Chinese priority: Patent Law Arts. 29–30; Regulations Arts. 34–37

• U.S. provisional: 35 U.S.C. 111(b), 119(e); 37 CFR 1.53(c), 1.78(a)

Deadline

• China: 12 months for invention/utility model; 6 months for design

• U.S.: nonprovisional within 12 months

Nature of the earlier filing

• China: formal application; earlier domestic-priority filing deemed withdrawn (Regulations Art. 35(3))

• U.S.: not examined; no claims required; abandoned if unused (111(b)(2)(5))

Content standard

• China: same subject matter (Guidelines Part II, Ch. 3, §4.1.2)

• U.S.: 112(a) disclosure, except best mode (119(e)(1))

Remedies

• China: restore priority within 2 months; add/correct priority within 16/4 months (Regs. Arts. 36–37)

• U.S.: +2 months for unintentional delay (119(e)(1)); claim within 4/16 months (37 CFR 1.78(a)(4))

Patent term

• China: from actual filing date (Patent Law Art. 42; Regs. Art. 12(1))

• U.S.: provisional year does not count; from nonprovisional filing (154(a)(2)(3))

Invention completed in China

• Either path: a first filing in the U.S. still requires prior confidentiality examination (Patent Law Art. 19)

5. What two cases show

Case 1: “Alogliptin”—priority is not “close enough”

SPC IP Admin. Final Nos. 344 & 371 (2021) (judgment 11 Dec 2023). A Japanese company held two diabetes-related invention patents claiming foreign priority from two earlier filings. In invalidation, CNIPA held that another reference already disclosed the same subject matter, so the earlier filings were not first filings and priority failed; Beijing IP Court affirmed.

The Supreme People’s Court reversed. Whether later and earlier applications share the same subject matter turns on whether the claim limitations can be directly and unambiguously derived from the earlier documents. The reference did not teach the “5 mg to 250 mg daily dose” in claim 1, nor could that range be so derived; the earlier filings were therefore the first same-subject-matter filings, and priority stood. Features that may drop out of novelty/inventiveness analysis can still matter for priority. (The case applied Art. 29(1) of the 2000 Patent Law.)

Takeaway: priority is not “close enough.” Every claim limitation needs a foothold in the earlier filing.

Case 2: New Railhead—skipping claims is not skipping the specification

New Railhead Mfg., L.L.C. v. Vermeer Mfg. Co., 298 F.3d 1290 (Fed. Cir. 2002), cited in MPEP §211.05: a drill bit was offered for sale; a provisional was filed within the one-year grace period; the nonprovisional followed within a year of the provisional but more than a year after the offer. Claim 1 recited an angled relationship between bit body and probe housing that the provisional did not describe. The court held the provisional did not support that limitation; the patent could not claim the provisional date. Losing the date made the earlier offer prior art under then-35 U.S.C. 102(b), and the patent fell.

Takeaway: a provisional drops claims, not the specification. A few slides of PPT may stake only an empty date.

6. Practical points for Chinese applicants

• For inventions completed in China, finish confidentiality examination before choosing where to stake a date. A U.S. provisional still triggers Patent Law Article 19.

• The steadier path is usually: file in China first, then enter the U.S. within twelve months under the Paris Convention or PCT, claiming the Chinese filing date (35 U.S.C. 119(a)).

• If you do use a U.S. provisional, write it as a full specification—embodiments, variants, parameter ranges—not something you plan to flesh out later.

• Mark at least three calendar dates: the 12-month later filing; the 16-month deadline under Patent Law Article 30 for the earlier-application copy; and the U.S. 4-month/16-month claim window.

• Missed a deadline? Do not abandon by reflex. China offers 2-month restoration and 16/4-month add/correct; the U.S. offers a 2-month unintentional-delay extension. Both require procedure and reasons—not a habit.

• Multiple priorities can stack. Regulations Article 35(1) allows one application to claim several priorities, timed from the earliest. Projects that improve in stages can file in batches and consolidate later.

Chinese priority is closer to “copying the first filing elsewhere”: the earlier application must itself be solid. A U.S. provisional is closer to saving a snapshot and installing the full system later. The entry fee is low, but a blurry snapshot will not be recognized when you try to mount it. What the two tools really compare is not cost—it is how much you wrote on day one.

Conclusion

Both China and the United States offer tools to stake a filing date, each with a twelve-month window. China puts the bar on “same subject matter” and procedure; the United States puts it on how thoroughly the provisional is written.

For companies inventing in China, there is an extra sequencing rule: confidentiality examination first, foreign filing second. Where to file first has no universal answer—markets, teams, and invention maturity all matter.

One point is worth remembering: how much of the date you keep depends on how much you wrote that day. Filing a provisional before a U.S. trade show does not, by itself, mean you are “safe.”