United States Gypsum Co. v. National Gypsum Co.

Background

United States Gypsum Company (a building-materials patent owner) sued National Gypsum and Certain‑teed (longtime licensees) and others in a government antitrust case that began in 1940. The courts later held that Gypsum’s industry‑wide patent licenses with price‑fixing terms were illegal and entered a 1951 decree ending those license terms. After licensees stopped paying royalties, Gypsum in 1953 sued to recover payments for use of its patents from February 1, 1948, to May 15, 1951, bringing five alternative claims in separate federal suits.

Reasoning

The Court addressed whether the antitrust court could bar all of Gypsum’s suits without a trial on later facts. It upheld the antitrust court’s power to modify its decree and agreed Counts I and II (contract claims for royalties under the old licenses) must be dismissed under the decree. But the Court reversed the broader ban on the remaining counts, holding that quantum meruit (a claim for reasonable value) and patent‑infringement claims require a factual trial on whether earlier misuse continued or was purged.

Real world impact

The decision means patent owners found to have misused patents cannot be blocked from seeking fair payment on every ground without proof that misuse continued. Licensees who refused to pay may still face trials on fair‑value or infringement claims. The case sends the factual issues about industry conduct after 1941 back to the antitrust court for trial, and if Gypsum survives misuse defenses, ordinary district courts will handle remaining patent issues.

Dissents or concurrances

Justice Black (joined by two Justices) dissented and would have affirmed; he argued the earlier conspiracy finding kept Gypsum’s wrongdoing alive and that relabeling claims should not allow recovery, stressing the equitable 'unclean hands' rule.