3.1 First-Inventor-to-File (FITF) & Effective Filing Dates
Key Takeaways
- The Leahy-Smith America Invents Act (AIA) transitioned the U.S. patent system from First-to-Invent to First-Inventor-to-File for applications with an effective filing date on or after March 16, 2013.
- 35 U.S.C. § 102(a)(1) defines prior art as disclosures patented, described in a printed publication, in public use, on sale, or otherwise available to the public anywhere in the world prior to the effective filing date.
- 35 U.S.C. § 102(a)(2) establishes that U.S. patents, published U.S. patent applications, and published PCT applications designating the U.S. naming another inventor serve as prior art as of their earliest effective filing date.
- Effective Filing Date (EFD) is determined on a claim-by-claim basis and corresponds to the actual filing date or the earliest priority/benefit date under 35 U.S.C. §§ 119, 120, 365, or 386.
- Foreign priority under § 119(a)-(d) now establishes the effective filing date for § 102 examination under the AIA, eliminating the pre-AIA distinction between domestic and foreign filing dates.
3.1 First-Inventor-to-File (FITF) & Effective Filing Dates
1. Historical Paradigm Shift: First-to-Invent vs. First-Inventor-to-File
The Leahy-Smith America Invents Act (AIA), enacted on September 16, 2011, fundamentally transformed United States patent law by replacing the historical First-to-Invent (FTI) regime with the First-Inventor-to-File (FITF) system. This transition took effect on March 16, 2013. Any patent application containing even a single claim with an effective filing date on or after March 16, 2013, is examined under the AIA regime governed by revised 35 U.S.C. § 102 and 35 U.S.C. § 103.
Under the Pre-AIA system, patent entitlement was awarded to the applicant who could prove the earliest date of invention (conception coupled with diligence toward reduction to practice), regardless of whether another inventor filed a patent application first. Applicants could submit affidavits under 37 C.F.R. § 1.131 to "swear behind" intervening prior art by demonstrating an earlier date of invention within the United States or a NAFTA/WTO member country.
In contrast, the AIA FITF framework establishes that priority of right belongs to the inventor who is the first to file a patent application, provided that applicant did not derive the invention from another. Under the AIA, date of invention is legally irrelevant to novelty and nonobviousness determinations during examination. Consequently, interference proceedings under former 35 U.S.C. § 135 were eliminated for AIA applications and replaced by derivation proceedings to ensure that only true inventors—not mere copiers—receive patents.
Furthermore, the AIA eliminated geographic restrictions on prior art. Under Pre-AIA § 102(a) and § 102(b), public use or on-sale activity qualified as prior art only if it occurred within the United States. Under AIA § 102(a)(1), public disclosures, public uses, commercial sales, and printed publications anywhere in the world constitute prior art if made prior to the claimed invention's effective filing date.
2. 35 U.S.C. § 102(a)(1) — Public Prior Art Disclosures
Statutory provision 35 U.S.C. § 102(a)(1) sets forth the core novelty prohibition for publicly accessible prior art. Under this subsection, a person is entitled to a patent unless:
"the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention."
Critical Structural Components of § 102(a)(1):
- Temporal Anchor: The reference date is the Effective Filing Date (EFD) of the claimed invention, not the invention date.
- Worldwide Scope: Every category of prior art enumerated in § 102(a)(1) applies globally. A public oral presentation in Tokyo, a trade show demonstration in Frankfurt, or a sales offer in Toronto all qualify as prior art against a U.S. application.
- Catch-All Phrase — "Otherwise Available to the Public": This phrase expands statutory prior art beyond traditional printed publications and patents. It encompasses internet postings, online video demonstrations, code repositories, public webinars, and unindexed digital archives, provided the information was accessible to the interested public before the applicant's EFD.
- Public Accessibility Requirement: To qualify as prior art under § 102(a)(1), the disclosure must be accessible to persons skilled in the relevant art exercising reasonable diligence. Confidential disclosures subject to non-disclosure agreements (NDAs) generally do not qualify as public disclosures under § 102(a)(1), though commercial offers for sale under confidentiality agreements are subject to specialized treatment under Supreme Court precedent.
3. 35 U.S.C. § 102(a)(2) — Issued Patents and Published Patent Applications
Statutory provision 35 U.S.C. § 102(a)(2) governs secret prior art consisting of U.S. patents, published U.S. patent applications, and published WIPO (PCT) applications naming a different inventive entity. Under this subsection, a person is entitled to a patent unless:
"the claimed invention was described in a patent issued under section 151, or in an application for patent published or deemed published under section 122(b), in which the patent or application names another inventor and was effectively filed before the effective filing date of the claimed invention."
Key Principles of § 102(a)(2) Art:
- Inchoate / Secret Prior Art Date: Unlike § 102(a)(1) references which become prior art on their public publication date, a § 102(a)(2) reference operates retroactively as prior art as of its earliest effective filing date under 35 U.S.C. § 100(i), provided the subject matter relies upon a proper priority or benefit claim.
- Different Inventive Entity Requirement: The § 102(a)(2) reference must name "another inventor". If the reference lists the exact same inventive entity as the application under examination, it cannot serve as prior art under § 102(a)(2).
- International Applications (PCT): Under AIA § 102(a)(2), a published WIPO PCT application designating the United States qualifies as prior art as of its international filing date (or foreign/provisional priority date), regardless of whether it was published in English or ever entered the U.S. national stage under 35 U.S.C. § 371.
4. Effective Filing Date (EFD) Mechanics & Priority Benefit Claims
Under 35 U.S.C. § 100(i), the Effective Filing Date (EFD) for a claimed invention in a patent application is defined as either:
- The actual filing date of the patent application containing the claim; or
- The filing date of the earliest parent application in which the claimed invention is disclosed in compliance with 35 U.S.C. § 112(a), provided the application is entitled to the benefit of or priority to that earlier application.
EFD is determined on a claim-by-claim basis. In a continuation-in-part (CIP) application, original claims fully supported by the parent application retain the parent's earlier EFD, whereas new claims directed to subject matter added in the CIP receive the actual filing date of the CIP application as their EFD.
Statutory Bases for Priority and Benefit Claims:
| Statutory Provision | Benefit / Priority Type | Statutory Requirements & Conditions |
|---|---|---|
| 35 U.S.C. § 119(e) | U.S. Provisional Application | Nonprovisional must be filed within 12 months (or 14 months with petition under 37 CFR 1.78(b) for unintentional delay); common inventor/assignee; explicit reference in Application Data Sheet (ADS); written description enablement under § 112(a). |
| 35 U.S.C. § 120 | U.S. Nonprovisional (Continuation, Divisional, CIP) | Continuous co-pendency; specific reference in ADS; at least one common inventor or common applicant; disclosure of claimed subject matter in parent under § 112(a). |
| 35 U.S.C. § 119(a)-(d) | Foreign Priority (Paris Convention) | Filed within 12 months of foreign filing; certified copy of foreign application; specific ADS reference. Establishes EFD for AIA § 102 examination. |
| 35 U.S.C. § 365 / § 386 | PCT International / Hague International Design | Priority/benefit claims stemming from international patent applications and international design applications. |
5. Comparative Overview: Pre-AIA § 102 vs. AIA § 102
| Aspect | Pre-AIA 35 U.S.C. § 102 | AIA 35 U.S.C. § 102 |
|---|---|---|
| Primary Priority Basis | First-to-Invent (FTI) | First-Inventor-to-File (FITF) |
| Critical Reference Date | Date of Invention (could swear back via Rule 131) | Effective Filing Date (EFD) |
| Geographic Scope (Public Use / Sale) | United States only (§ 102(a)/§ 102(b)) | Worldwide scope for all prior art categories |
| Foreign Priority Impact | § 119 priority gave defensive shield but NOT prior art date for § 102(e) | Foreign priority date establishes EFD under § 100(i) for § 102(a)(2) art |
| Catch-All Prior Art Provision | None (strictly limited to enumerated statutory acts) | "Or otherwise available to the public" (§ 102(a)(1)) |
| Derivation / Swearing Back | Interference proceedings (§ 135); Rule 131 affidavits | Derivation proceedings (§ 135); Rule 130 declarations |
An applicant files a U.S. nonprovisional application on August 15, 2024, claiming the benefit of a U.S. provisional application filed on August 20, 2023. The provisional application provides full written description and enabling support under 35 U.S.C. § 112(a) for Claim 1. A third-party research paper describing the exact invention of Claim 1 was published on November 10, 2023. Which statement correctly describes the prior art status of the research paper against Claim 1?
How did the Leahy-Smith America Invents Act (AIA) alter the geographic boundary rules for prior art under 35 U.S.C. § 102(a)(1) compared to Pre-AIA law?
A third party files a WIPO PCT international patent application designating the U.S. on January 10, 2023, claiming priority to a French patent application filed on February 1, 2022. The PCT application publishes in French on August 10, 2023. Under AIA 35 U.S.C. § 102(a)(2), what is the earliest prior art date of this published PCT application against a U.S. patent application filed by another inventor?
Which of the following application scenarios falls under the First-Inventor-to-File (FITF) examination framework of AIA 35 U.S.C. § 102 rather than Pre-AIA law?