Parker, Acting Commissioner of Patents and Trademarks v. Flook

Decided June 22, 1978. John Paul Stevens delivered the opinion of the Court.

Docket 77-642 · 437 U.S. 584 (1978) · Cited 347 times

We don’t yet publish a summary of this opinion — read the official text below for the Court’s holding and reasoning.

How the Justices voted

Decided 6–3.

“Concurring” means agreeing with the outcome; any split shown is the Court’s judgment, not each Justice’s reasoning. Source: the Supreme Court Database (Spaeth et al.), Washington University.

Precedents cited

Supreme Court decisions this opinion relies on, ordered by how often it cites each. Cases in our collection link through; others are named.

• Gottschalk v. Benson · 409 U.S. 63 (1972)
• Eibel Process Co. v. Minnesota & Ontario Paper Co. · 261 U.S. 45 (1923)
• Funk Bros. Seed Co. v. Kalo Inoculant Co. · 333 U.S. 127 (1948)
• Le Roy v. Tatham · 55 U.S. 156 (1853)
• White v. Dunbar · 119 U.S. 47 (1886)
• Cochrane v. Deener · 94 U.S. 780 (1877)
• Deepsouth Packing Co. v. Laitram Corp. · 406 U.S. 518 (1972)
• Risdon Iron & Locomotive Works v. Medart · 158 U.S. 68 (1895)

Cited by

Later Supreme Court opinions in our collection that cite this case.

• Diamond v. Diehr · 450 U.S. 175 (1981)
• Mayo Collaborative Services v. Prometheus Laboratories, Inc. · 566 U.S. 66 (2012)
• Diamond v. Chakrabarty · 447 U.S. 303 (1980)
• Laboratory Corp. of America Holdings v. Metabolite Laboratories, Inc. · 548 U.S. 124 (2006)

Official text

Read the official opinion (U.S. Reports, govinfo.gov)

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Source: the U.S. Reports via govinfo.gov; authoring Justice and vote lineup from the Supreme Court Database (Washington University). Citation count from the Free Law Project’s CourtListener bulk data. Data last verified 2026-07-03. Informational only; verify against the primary source before relying. Not a consumer report (FCRA).