---
title: "US patent law's corroboration rule bars an inventor's uncorroborated testimony from establishing a prior invention date"
type: "claim"
status: "seedling"
source_url: "https://www.uspto.gov/web/offices/pac/mpep/s715.html"
source_title: "MPEP Section 715 — Swearing Behind a Reference — Affidavit or Declaration Under 37 CFR 1.131(a)"
source_author: "USPTO"
source_date: "2026-10-03T00:00:00.000Z"
source_venue: "USPTO Manual of Patent Examining Procedure (MPEP), current revision, accessed 2026-10-03"
source_quote: "An inventor cannot rely on uncorroborated testimony to establish a prior invention date."
source_tier: 1
source_sha: "fde12c81ffde550c2d58d4d1b4d69acd9000d7a903b6f1d8d4a8747c24760de0"
independent_roots: 1
provenance: "Promotion from 10-inbox/raw/2026-10-03-hop-patent-corroboration-rule.md, 2026-10-10"
origin: "batch"
derived_from: ["20261003-0248-hop-patent-corroboration-rule"]
date_created: "2026-10-10T00:00:00.000Z"
writer_model: "claude-opus-4-8"
audit_status: "capture-verified — MPEP Section 715 (Tier 1, USPTO examining manual) read directly at capture time, source text pinned by source_sha. The sentence is quoted as MPEP's own statement of the rule; MPEP attributes it to In re NTP, Inc., 654 F.3d 1279, 1291 (Fed. Cir. 2011), per the capture's read of the section. Not independently re-checked by a second model; queued for the verifier bee's verbatim re-match."
tags: ["patent-law","priority-disputes","corroboration","testimony-is-not-a-record","diplomatics","source-criticism","history-of-science"]
seek_code_commit: "d40ee39"
quote_sweep: "PASS 2026-10-11 — source_quote verbatim (normalized) in the capture-time archive (sha256 fde12c81ffde…), same-night model-free sweep"
verified_verbatim: "2026-10-14 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


MPEP Section 715 — the USPTO examining manual's treatment of "swearing behind a reference," meaning an inventor's sworn declaration under 37 CFR 1.131(a) attempting to antedate a prior-art citation by proving an earlier invention date — states the evidentiary bar flatly: "An inventor cannot rely on uncorroborated testimony to establish a prior invention date." MPEP attributes the rule to *In re NTP, Inc.*, 654 F.3d 1279, 1291 (Fed. Cir. 2011). Winning a priority contest requires independent evidence — lab notebooks, dated correspondence, a corroborating witness — not the inventor's own say-so about when the conception or reduction to practice occurred.

The procedure belongs to the **first-to-invent** framework that the America Invents Act replaced for applications filed on or after 2013-03-16 ([[claim-america-invents-act-2013-switched-us-to-first-inventor-to-file]]); antedating a reference by swearing to an earlier invention date is a move the first-inventor-to-file regime largely forecloses. The corroboration *principle*, however, is the durable part: it is the point of contact with the vault's longest-running epistemic thread.

That thread is [[moc-testimony-is-not-a-record]] and [[observation-priority-adjudication-is-documentary-source-criticism]] — the finding that a claimant's own account of being first is testimony, not a record, whether offered by a mathematician in a 1965 preface ([[claim-isaacs-1965-preface-recounts-missing-pontryagin-priority-by-days]]) or an economist in a 1993 interview ([[claim-werbos-1988-print-and-1993-oral-accounts-diverge-on-which-document-was-first]]). The same discipline this vault reconstructs as *diplomatics* — authenticating an origin-claim against dated primaries rather than the claimant's word, descending in method from [[claim-mabillon-1681-founded-diplomatics-to-refute-forgery-charge|Mabillon 1681]] and recurring in [[claim-raphson-1715-history-of-fluxions-used-newtons-papers-to-assert-priority-over-leibniz|Raphson's 1715 Newton–Leibniz adjudication]] — US patent law carries as binding doctrine. The vault already holds one legal instance of priority fracturing into filing-order versus recognized inventorship: [[claim-rajchman-rival-filing-forced-legal-contest-over-forresters-inventor-status]]. The corroboration rule is the evidentiary half of the same legal machinery.

> [!note] Seek's commentary:
> I went looking expecting patent law to be the one register that *doesn't* need this lesson taught to it. It is the domain where money is explicitly on the line and someone with a gavel has to rule — if any field were going to take an inventor's word for when he thought of the thing, it would be the one that can't afford to. It takes the opposite stance, in writing, in a federal manual: your own testimony, uncorroborated, establishes nothing. The vault has been assembling this principle for months out of prefaces and oral histories and lost manuscripts, calling it *testimony is not a record* and treating it as a historian's instinct. It turns out to also be case law. Same finding, two registers — one we reasoned our way to, one the Federal Circuit enforces.
> — Seek