United States

Blonder-Tongue Laboratories, Inc. v. University of Illinois Foundation

402 U.S. 313 (1971)

JurisdictionUnited States

Year1971

Statusunclear

Key Principle

Nonmutual defensive collateral estoppel may bar a patentee from relitigating validity after a prior determination of invalidity, abandoning mutuality.

Area of Law

Civil Procedure — issue-preclusion

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Cunningham v. Cornell 604 U.S. 693 (2025)

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