Examples
Worked examples
- Is an instance
A postdoc formulates the specific chemical structure and synthesis route for a new compound and records it, with dates, in a lab notebook before any prototype is built. Because she formed a definite and permanent idea of the complete, operative invention, she meets the conception standard and is named an inventor on the resulting patent application — the PI who supervised the project but did not contribute that specific conceptual step is not automatically a co-inventor.
- Is an instance
Two researchers at different institutions, working independently but building on a shared discussion, each conceive of a distinct improvement that becomes a separate claim in the same non-provisional application: one conceives the core mechanism (claim 1), the other conceives a specific dosing method that depends on it (claim 4). Under 35 U.S.C. §116, both are properly named as joint inventors even though neither worked on the other's claim, because each contributed to the conception of at least one claim in the application.
Counter-examples
Looks similar, but isn't
- Not an instance
A research technician runs an assay exactly as instructed by the PI, generating the data that confirms the PI's already-conceived hypothesis. Because the technician exercised no independent inventive judgment — only skill in executing someone else's detailed instructions — the technician does not meet the conception standard and is not an inventor, even though their name may appear as a co-author on a resulting publication under CRediT/ICMJE authorship criteria.
- Not an instance
A department chair who secured the grant funding and provided lab space for a project is not an inventor on the resulting patent solely by virtue of that funding or administrative role; inventorship under §116 requires an actual contribution to conception of a claim, not financial or supervisory support.
Editorial commentary
Inventor vs. author vs. employee
Inventorship is a distinct legal determination from manuscript authorship and from an individual’s employment or funding role. A university’s invention disclosure process exists precisely because these lists frequently diverge: a paper’s corresponding author supervising a federally funded project is not automatically a patent inventor, and a person who conceived a claim but who chose not to co-author the resulting publication is still legally an inventor. See the companion CASRAI term Invention for how a conceived idea becomes a disclosable, and in federally funded cases a Bayh-Dole subject, invention, and the Co-Inventors: The Legal Test for Joint Inventorship guide for a fuller walkthrough of how TTOs and patent counsel resolve multi-contributor cases.
Why this matters for TTOs
Naming inventors correctly is not a formality. An inaccurately named inventor — whether an omitted true inventor or an improperly included non-inventor — can render an issued patent invalid or unenforceable if the error is found to have been made with deceptive intent, and even an innocent error can complicate licensing, ownership assignment chains, and royalty distribution under a university’s inventor-recognition policy. Because inventorship is assessed claim-by-claim, the named-inventor list on an initial provisional filing can legitimately change by the time a non-provisional application issues, as claims are added, narrowed, or dropped during prosecution. TTOs typically ask patent counsel to confirm inventorship at each substantive claim amendment, not only at the initial invention disclosure stage.
Conception, not reduction to practice
The conception standard is deliberately distinct from reduction to practice (building or testing the invention, or filing a patent application, which counts as constructive reduction to practice). A person can be a proper inventor without ever having physically built anything, and a person who built a working prototype from someone else’s fully conceived design is not, by that construction work alone, an inventor. This is also why joint inventors under 35 U.S.C. § 116 need not have worked together in the same place or at the same time, or contributed equally — the statute only requires that each named inventor contributed to the conception of at least one claim.
Machine-readable encodings
Use in your systems
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vocab-identifier="https://casrai.org/dictionary/"
vocab-term="Inventor"
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"description": "Under U.S. patent law, an inventor is a natural person who contributed to the <strong>conception</strong> of at least one claim of a patented (or claimed) invention, as governed by 35 U.S.C. § 116. Conception is the operative legal test, not construction, funding, supervision, or manuscript authorship: it is the formation, in that person's mind, of a definite and permanent idea of the complete and operative invention, later reduced to a form a person skilled in the art could reproduce without further inventive work. A person who only executes another's detailed instructions, provides routine technical assistance, funds the research, or supervises a lab does not become an inventor by virtue of that role alone. When two or more people jointly satisfy the conception standard, each is a joint inventor under § 116, even if they worked at different times, contributed unequally, did not work together physically, or each contributed to only some of the claims — provided each contributed to the conception of at least one claim in the resulting application. Inventorship is determined claim-by-claim and can change as claims are added, amended, or cancelled during prosecution, which is why university technology transfer offices (TTOs) routinely revisit the named-inventor list as a patent application matures.",
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