From first-to-invent to first-inventor-to-file
Before the Leahy-Smith America Invents Act (AIA, signed September 16, 2011), the United States used a first-to-invent system — the patent right went to whichever inventor first conceived the invention and reduced it to practice, regardless of filing order. When two inventors filed conflicting claims, the USPTO resolved priority through interference proceedings, examining lab notebooks, testimony, and corroborating evidence to determine who invented first. This system was unique in the world; every other major patent jurisdiction used first-to-file. The AIA's first-inventor-to-file system, effective March 16, 2013, changed the fundamental rule: the inventor who files first wins. The AIA is technically 'first-inventor-to-file' (not just 'first-to-file') because the filer must be the actual inventor — a third party who learns of another inventor's conception cannot steal rights by racing to the patent office. But between legitimate independent inventors, whoever files first gets the patent.
AIA § 102: the new prior art definition
AIA § 102(a) defines prior art as any disclosure — patent, publication, public use, on sale, or 'otherwise available to the public' — before the effective filing date of the claimed invention. The 'otherwise available to the public' language intentionally expanded prior art beyond the enumerated categories of the pre-AIA statute. Any disclosure that makes the invention publicly accessible — a conference presentation, a trade show demo, a pre-publication manuscript posted to a preprint server — can qualify as prior art. This is a meaningful expansion from pre-AIA, which listed specific categories. The key date reference also changed: pre-AIA used the invention date; AIA uses the effective filing date. Inventors with earlier conception dates can no longer swear behind prior art that postdates their conception — they must have an earlier effective filing date.
The grace period: protecting your own disclosures
AIA § 102(b)(1) provides a critical exception: disclosures made within one year before the effective filing date are not prior art if they were made by the inventor or someone who obtained the subject matter from the inventor. This one-year window is the AIA grace period — a concession to US practice (pre-AIA also had a one-year grace period) and to the reality that inventors often need to test and publicize inventions before filing. The grace period is narrower than it appears, however. It only shields the inventor's own prior disclosures. If a third party independently discloses the same invention — even one day before the inventor's own grace period disclosure — that third-party disclosure is prior art. The grace period also does not extend to third-party patents and applications filed before the inventor's own disclosure. The strategic implication: the AIA grace period is a safety net, not a substitute for early filing. File before any public disclosure whenever possible; the grace period protects you only from your own prior disclosures.
Provisional applications and the AIA priority strategy
Provisional patent applications are more strategically important under AIA than they were under the first-to-invent system. A provisional application: (1) establishes an effective filing date for AIA § 102 purposes; (2) does not need to include claims; (3) is not examined and will not issue as a patent; (4) gives the inventor 12 months to file a nonprovisional application claiming priority to the provisional's filing date. Under AIA's first-inventor-to-file rule, filing a provisional early — even before the invention is fully reduced to practice — locks in an earlier effective filing date that defeats subsequent third-party prior art. Best practice: file a provisional as soon as the invention can be described sufficiently to satisfy the written description and enablement requirements (35 U.S.C. § 112). The provisional preserves the filing date priority; the nonprovisional filed within 12 months gets the benefit of that date for any claims adequately supported by the provisional's disclosure.
Derivation proceedings: replacing interferences
The AIA replaced interference proceedings with derivation proceedings (35 U.S.C. § 135). An interference determined who was first to invent; a derivation proceeding determines whether an earlier filer derived the claimed invention from a later filer. The distinction reflects the AIA's premise: under first-to-file, if two inventors independently invent the same thing, the earlier filer simply wins — no proceeding needed. A derivation proceeding only applies when the earlier filer learned about the invention from the later inventor and then filed before them. Derivation must be shown by a preponderance of the evidence that: (1) an inventor named in the earlier application derived the claimed invention from the petitioner's inventor; and (2) the earlier application was filed without authorization. Derivation petitions must be filed within one year of the first publication of a claim by the earlier-filed application. Derivation proceedings are rare — independent inventors racing to the patent office is a first-inventor-to-file outcome, not a derivation.
Transition: pre-AIA and AIA applications
The AIA applies only to patent applications with an effective filing date on or after March 16, 2013. Applications filed before that date — and continuation and divisional applications that claim priority only to pre-March 16, 2013 applications — remain subject to pre-AIA prior art rules and first-to-invent priority. Mixed applications (those with at least one claim having an effective date before March 16, 2013 and at least one claim having an effective date on or after March 16, 2013) require careful tracking: each claim is individually subject to either AIA or pre-AIA prior art, depending on its effective date. In practice, the vast majority of active patent applications are now AIA applications, and the pre-AIA rules have diminishing relevance. However, practitioners handling older patents and applications (particularly continuation chains that originate before 2013) must remain attentive to whether AIA or pre-AIA prior art rules govern each claim.
Frequently Asked Questions
What is the AIA first-inventor-to-file system?
The Leahy-Smith America Invents Act (AIA), signed in September 2011 and effective March 16, 2013, replaced the United States' longstanding first-to-invent system with a first-inventor-to-file system. Under the old system, priority between two competing inventors was determined by who first conceived of and reduced the invention to practice — a complex inquiry that required interference proceedings. Under the AIA, patent priority goes to the first inventor to file a patent application, regardless of when they conceived the invention. The AIA is still a 'first-inventor' (not first-to-file) system: an inventor cannot steal rights by filing an application based on another person's disclosure — the filer must be the actual inventor. The AIA's first-inventor-to-file rule applies to applications with an effective filing date on or after March 16, 2013; patents and applications with earlier effective filing dates continue to be governed by the old first-to-invent rules.
What is the AIA grace period and how does it work?
Under AIA § 102(b)(1), disclosures made one year or less before the effective filing date do not constitute prior art against the inventor's own application if they were made by the inventor, a joint inventor, or someone who obtained the subject matter from the inventor. This is the AIA's one-year grace period. Example: Inventor A discloses her invention at a conference on January 1, 2023. She files her patent application on December 15, 2023 (within one year). Her own January 2023 disclosure is not prior art against her application. The grace period is narrower than it appears: (1) it only protects the inventor's own disclosures (not third-party disclosures of the same invention); (2) it protects only disclosures made by, or obtained from, the inventor — a third party who independently discovers the same invention and publishes it within a year of your filing date creates prior art you cannot overcome; (3) the grace period does not restart the clock — if a third party publishes the invention before your own disclosure, that publication may be prior art. The practical lesson: file early, before any public disclosure.
How does AIA § 102 define prior art?
AIA § 102(a) provides that a claimed invention is not patentable if it was: (1) 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; or (2) described in a patent granted or a published application filed by another inventor before the effective filing date of the claimed invention. The AIA's 'otherwise available to the public' language is broader than the pre-AIA categories — it covers any disclosure that makes the invention accessible to the public, including oral presentations with publicly available slides, internet postings, and physical exhibitions. AIA § 102(b)(2) provides an exception for disclosures in third-party patents or applications: they do not constitute prior art if (A) the disclosure was made by the inventor; (B) the subject matter was obtained from the inventor; or (C) the subject matter and the claimed invention were commonly owned before the effective filing date. The commonly-owned exception enables large organizations to file patent applications on inventions that employees described in prior-filed applications without creating internal prior art problems.
What are derivation proceedings under the AIA?
Under the pre-AIA first-to-invent system, competing inventors disputed priority through interference proceedings at the USPTO. The AIA abolished interferences and replaced them with derivation proceedings. A derivation proceeding is a USPTO proceeding to determine whether an inventor named in an earlier-filed application derived the claimed invention from an inventor named in a later-filed application. Key aspects: (1) the proceeding can only be initiated by the inventor with the later-filed application; (2) the petition must be filed within one year of the first publication of a claim by the earlier-filed application; (3) the petitioner must show that an inventor named in the earlier-filed application derived the claimed invention from an inventor in the petitioner's application; (4) derivation requires both that the earlier filer had communication of the complete conception of the claimed invention, and that they filed the application based on that communication. Derivation proceedings are rare because the AIA's first-inventor-to-file system largely eliminates priority contests — if two inventors independently invent the same thing and one files first, that inventor wins without a proceeding.
What changed strategically for inventors under the AIA?
The AIA's first-inventor-to-file system changed patent strategy significantly: (1) File early, not last-minute: under first-to-invent, you could file after conception and rely on a corroborated invention date. Under AIA, another inventor's filing cuts off your priority. File a provisional application to lock in the earliest possible filing date, even before the invention is fully reduced to practice. (2) Document external disclosures carefully: any disclosure (conference presentation, publication, investor pitch, beta testing) starts a one-year clock for your own grace period but immediately creates prior art risks from third-party disclosures. (3) Internal lab notebooks are less legally critical for priority (since first-to-file eliminates priority contests based on invention date) but remain important for proving inventorship and defending against derivation challenges. (4) Provisional applications are more strategically valuable under AIA: file a provisional immediately after conception to reserve an early priority date, then file the non-provisional within 12 months when the invention is better developed. (5) Foreign filing decisions: the AIA system aligns the US more closely with the rest of the world (which has always been first-to-file), simplifying global patent strategy.