Patent Ownership & Inventorship

Correction of Inventorship

Who's an inventor — and how to fix it when the wrong name appears on a patent.

Quick Answer

An inventor is someone who conceived a claimed element — not just someone who reduced it to practice or provided technical support. Incorrect inventorship can invalidate a patent. 35 U.S.C. § 256 allows correction by petition at any time, provided the error was not made with deceptive intent.

Who is an Inventor?

Conception — The Legal Standard

Inventorship is determined claim-by-claim. A person is an inventor if they conceived at least one element of at least one claim. The standard: Burroughs Wellcome Co. v. Barr Laboratories (Fed. Cir. 1994):

"Conception is the formation in the mind of the inventor of a definite and permanent idea of the complete and operative invention, as it is hereafter to be applied in practice."

IS an inventor

Conceived the complete solution or a claimed element
Formed the mental picture of the operative invention
Made an inventive contribution to at least one claim
May or may not have reduced to practice
Co-inventor who contributed to different claims

Is NOT an inventor

Followed inventor's instructions to build/test
Provided workshop skill without contributing to conception
Suggested unclaimed features (never appearing in any claim)
Funded or sponsored the research
Had an insight the inventor didn't adopt in the claims

Correction Procedure

35 U.S.C. § 256 — Correcting an Issued Patent

Section 256 provides two routes for correcting inventorship in an issued patent:

Route 1: Agreement of All Parties

Patent owner files petition with USPTO (Form PTO/AIA/03 or PTO/SB/44)
All current inventors and inventors to be added/removed sign a statement
Assignee or applicant signs the application
Fee: certificate of correction fee (~$160 large entity)
USPTO issues certificate of correction adding/removing inventors

Route 2: Court Order

File civil action in federal district court (or state court)
Court determines true inventorship
Court issues order specifying correct inventors
Present certified copy of court order to USPTO
USPTO makes correction based on court order without further examination

For correction during prosecution (before issuance), the procedure is simpler: 37 C.F.R. § 1.48 allows adding or removing inventors by filing a request with a statement of the explanation for the error, supplemental oath/declaration from any added inventor, and fee. No adverse finding is made for good-faith corrections.

Stakes

Why Incorrect Inventorship Matters

Invalidity

Under pre-AIA 35 U.S.C. § 102(f), a patent was invalid if a named inventor did not invent the claimed subject matter. Post-AIA, incorrect inventorship is a ground for invalidity if not corrected. Joint inventors own undivided shares — incorrectly naming an inventor creates an ownership claim dispute.

Unenforceability for inequitable conduct

If the incorrect inventorship was the result of intentional deception — deliberately excluding a true inventor or including a non-inventor to manipulate ownership or licensing — the patent can be held unenforceable under the inequitable conduct doctrine (Therasense but-for materiality + specific deceptive intent).

Ownership and licensing disputes

Each joint inventor owns an undivided interest in the entire patent and can license it to others without the other inventors' consent (35 U.S.C. § 262). If inventor X was wrongly excluded, X may assert co-ownership rights — including challenging licenses the assignee granted. Pre-discovery of a true inventor can be catastrophic in a licensing program.

University and employer IP rights

If a true inventor was an employee of Company A when the invention was made, Company A likely owns the invention under the employment agreement. Omitting that inventor may omit A's ownership interest. Bayh-Dole march-in rights and government contractor obligations attach to specific inventors' institutional affiliations.

FAQ

What is the legal standard for inventorship of a patent?

Under U.S. patent law, an inventor is someone who CONCEIVED the claimed invention — i.e., who had the 'definite and permanent idea of the complete and operative invention' (Burroughs Wellcome Co. v. Barr Laboratories, Fed. Cir. 1994). Conception is the mental formulation of the complete invention. Reduction to practice (actually making it or filing a patent application) is separate — a person who only reduces to practice without conceiving is not an inventor. Each named inventor must have conceived at least one CLAIMED element; mere technical assistance, following instructions, or suggesting an unclaimed feature does not make someone an inventor.

What happens if the wrong inventors are listed on a patent?

Incorrect inventorship — naming too few (omission of a true inventor) or too many (including someone who didn't contribute to the claims) — can render a patent invalid or unenforceable. Under pre-AIA § 102(f), a patent was invalid if the inventor did not himself invent the claimed subject matter. Post-AIA, incorrect inventorship is grounds for invalidity if it was not corrected. If incorrect inventorship resulted from deceptive intent by the named inventor (intending to deprive the true inventor of credit), the patent can be held unenforceable for inequitable conduct.

How do you add or remove an inventor from an issued patent under § 256?

35 U.S.C. § 256 provides two pathways: (1) All parties agree — the patent owner, any assignees, and all current and to-be-added/removed inventors sign a petition and/or a certificate of correction application; (2) Court order — a court can order correction of inventorship, and the USPTO will make the change upon receipt of a certified copy of the court order. For adding a previously omitted inventor: the true inventor must execute an oath or declaration. The change is not retroactive — it takes effect prospectively from the certificate of correction issue date.

Can correction of inventorship be used to fix a mistake made without deceptive intent?

Yes — 35 U.S.C. § 256 expressly allows correction when inventorship error occurred without deceptive intent. This covers honest mistakes: an applicant who genuinely believed the named inventors were the true inventors can correct the error. The key distinction is between a good-faith mistake (correctable under § 256) and a deliberate scheme to name the wrong inventors (inequitable conduct, potentially not correctable). Post-AIA, the 'without deceptive intent' language in § 256 makes correction available more broadly.

Does an inventor own the patent or receive royalties automatically?

Not automatically — inventorship and ownership are separate. An inventor has default ownership rights, but inventors typically assign their rights to an employer (under an employment agreement's IP assignment clause) or to a university (under Bayh-Dole). An inventor listed on a patent receives no royalties solely by virtue of being named — royalties flow from the license agreement or employment agreement. Joint inventors each own an undivided interest in the entire patent and can independently license or use it without the other inventors' consent (unless a different agreement governs), which is why proper inventorship is commercially critical.