What is the patent declaration?
The patent declaration (or oath) is a statement by each named inventor required under 35 U.S.C. § 115 for US non-provisional patent applications. The declaration identifies the inventor as an original inventor of the claimed invention, acknowledges the duty to disclose information material to patentability, and is made under penalty of perjury (for a declaration) or before a notary (for an oath). In practice, declarations are used almost universally rather than oaths, as declarations do not require notarization. Form PTO/AIA/08 (for declarations) or PTO/AIA/01 (for oaths) is used. The declaration is typically filed with the application or shortly after; the patent cannot issue without an executed declaration from each inventor.
Pre-AIA vs. post-AIA declarations
The America Invents Act (AIA), effective for applications filed September 16, 2012 or later, significantly changed declaration requirements. Under pre-AIA law, the inventor had to state they were the 'first and sole inventor' (or joint inventor), that they had reviewed and understood the application, and that they acknowledged the duty of candor. Post-AIA declarations are simpler: the inventor states only that they are an 'original inventor' of the claimed invention (dropping 'first and sole') and acknowledges the duty to disclose. This reflects the shift from first-to-invent (where being 'first' was legally significant) to first-inventor-to-file. The post-AIA change also allows the declaration to be filed later in prosecution, after claims are amended, as long as it covers the originally filed claims.
Substitute statement for unavailable inventors
One of the most practically significant AIA changes was the substitute statement mechanism under 37 C.F.R. § 1.64. Pre-AIA, if an inventor refused to sign or could not be found, the applicant faced serious hurdles — potentially abandonment. Post-AIA, an assignee or person obligated to receive assignment (such as the inventor's employer) can file a substitute statement if the inventor: (1) cannot be found or reached after diligent effort; (2) refuses to execute the declaration despite an obligation to do so; or (3) is legally incapacitated. The substitute statement must be supported by documentation of the circumstances. This change is particularly useful for startup companies where a founding employee left on bad terms and refuses to cooperate in patent prosecution, or for applications involving inventors who have since died or become unreachable.
Declaration timing and provisional applications
Provisional patent applications do not require a declaration — they have no formal inventor oath requirement. Declarations are required only for non-provisional applications. For a non-provisional application, the declaration does not need to be filed on the same day as the application: the application can be filed, receive a filing date, and then the declaration can be submitted later (before the patent issues). The USPTO will send a Notice to File Missing Parts if the declaration is absent at filing. If the declaration is not filed within the time set in the notice, the application may be abandoned (subject to revival with a petition). Many practitioners now file declarations promptly with the application to avoid this complication.
Joint inventors and the declaration
For applications with multiple inventors, each named inventor must execute a declaration. The inventors can each sign separately or all sign a single declaration form. Each inventor independently declares they are an original inventor of the claimed invention. There is no requirement that each inventor identify specifically which claims they contributed to — joint inventors are jointly credited as inventors of all claims. If one joint inventor cannot or will not sign, the substitute statement mechanism is available for that inventor's declaration. The duty to disclose applies equally to all inventors — each inventor must disclose to their patent attorney all prior art known to them that might be material to the patentability of the claims.
The duty to disclose and the declaration
The patent declaration acknowledges the inventor's duty to disclose to the USPTO information material to patentability — the obligation codified in 37 C.F.R. § 1.56. This duty applies not just to inventors but to all substantive persons involved in prosecution: the attorney/agent, and any person with material information about the application. Material information is typically prior art that a reasonable examiner would consider important in determining patentability. Failure to disclose material information with deceptive intent is inequitable conduct (Therasense v. Becton Dickinson, Fed. Cir. 2011 en banc — but-for materiality + specific deceptive intent), which renders the entire patent unenforceable. The Information Disclosure Statement (IDS) is the procedural mechanism for fulfilling the duty to disclose.
Consequences of a false declaration
Making a knowingly false statement in a patent declaration violates 18 U.S.C. § 1001 (criminal penalties for false statements to federal agencies) and can constitute inequitable conduct if made with specific deceptive intent. Naming a person as an inventor who did not contribute to the conception of any claimed element (misjoinder), or deliberately omitting a true inventor (non-joinder), with specific deceptive intent can render the patent unenforceable under Therasense. The deceptive intent standard is high — gross negligence is not sufficient; there must be specific intent to deceive. Inventors and their counsel who knowingly make false declarations also face potential USPTO disciplinary proceedings under 37 C.F.R. §§ 11.1 et seq.
Frequently Asked Questions
What is a patent oath or declaration?
A patent oath or declaration is a statement by the inventor(s) required under 35 U.S.C. § 115 for a US non-provisional patent application. The inventor must state: (1) that the inventor is an original inventor of the claimed invention; and (2) under oath (before a notary) or declaration (penalty of perjury). Pre-AIA, the declaration also required the inventor to state they were the first inventor and acknowledge the duty to disclose information material to patentability. Post-AIA (applications filed on or after September 16, 2012), the declaration is simpler: the inventor declares they are an original inventor of the claimed invention and acknowledges the duty to disclose. The declaration must be signed by each named inventor. The application can be filed without the declaration (using a PTO-SB/14 transmittal noting the missing declaration) but the declaration must be submitted before the patent can issue.
What changed about the declaration after the AIA?
The America Invents Act (AIA), which took effect for applications filed on or after September 16, 2012, made two significant changes to the patent declaration. First, the AIA simplified the declaration — removing the pre-AIA requirement that the inventor state they believed they were the 'original, first and sole inventor' and removing the acknowledgment of prior art. Post-AIA declarations simply require a statement that the declarant is an original inventor of the claimed invention and an acknowledgment of the duty to disclose. Second, and most importantly, the AIA created a 'substitute statement' mechanism under 37 C.F.R. § 1.64: if an inventor refuses to sign or cannot be reached after diligent efforts, an assignee or party to whom the inventor is obligated to assign can file a substitute statement explaining the circumstances, allowing the application to proceed without the inventor's signature.
What happens if an inventor refuses to sign the declaration?
Pre-AIA, if an inventor refused to execute the declaration, the patent application could be abandoned (since all inventors had to sign) — a significant problem when a co-inventor left a company on bad terms. Post-AIA, under 37 C.F.R. § 1.64, if an inventor refuses to sign or cannot be located after a diligent effort, an assignee, a person who has an obligation to assign, or a person who otherwise shows sufficient proprietary interest may file a substitute statement explaining: (1) the inventor cannot be found or reached after diligent effort; or (2) the inventor is under an obligation to assign but refuses to execute the declaration; or (3) the inventor is legally incapacitated. The substitute statement is accompanied by documentation showing the basis for filing and is not itself under oath by the inventor — the filing party makes a verified statement about the circumstances.
Do all joint inventors need to sign the declaration?
Normally, all named inventors must sign the patent declaration. For a joint invention, each co-inventor signs their own declaration (or they can sign a single declaration form together). Each inventor declares they are an original inventor of the claimed invention. The declaration does not require each inventor to state which specific claims they contributed to — joint inventors collectively are credited as inventors of all the claims. If one joint inventor refuses to sign or cannot be located, the post-AIA substitute statement mechanism is available for that inventor's declaration, allowing the other inventors to proceed. Omitting a co-inventor (non-joinder) or including a non-inventor (misjoinder) is an inventorship error under § 116, but can generally be corrected under § 256 if made without deceptive intent.
What are the consequences of a false declaration?
A patent oath or declaration made under 18 U.S.C. § 1001 (false statements to the federal government) and 35 U.S.C. § 115 subjects the declarant to criminal penalties for making knowingly false statements. A false declaration can also affect the patent's enforceability: if the false declaration was made with deceptive intent and constituted 'inequitable conduct' — e.g., knowingly naming false inventors to gain a patent (misjoinder with deceptive intent) — the patent can be rendered unenforceable under the Therasense standard (but-for materiality + specific deceptive intent). Specifically, deliberately naming someone as an inventor who did not contribute to the invention's conception, or deliberately omitting a true inventor, can be inequitable conduct if done with specific deceptive intent.