United States v. Adams

Background

The dispute is between an individual inventor, Adams, and the United States. Adams filed a patent application in December 1941 and received U.S. Patent No. 2,322,210 in 1943 for a nonrechargeable, water‑activated battery using a magnesium positive electrode and a cuprous chloride negative electrode. The battery could be stored dry, activated by adding plain water, delivered a nearly constant voltage, and worked across a wide temperature range. The Government tested and later procured the battery during World War II. Adams sued under the statute allowing claims for Government use of inventions, alleging infringement and breach of an implied contract; the Court of Claims found the patent valid and infringed in part and later addressed the contract claim.

Reasoning

The central question was whether Adams’s battery was new and nonobvious in light of earlier batteries and technical writings. The Court examined older references the Government cited and explained they did not teach a water‑activated magnesium–cuprous chloride device with the unexpected operating advantages Adams showed. The opinion stressed that the water‑activation and the interdependent functioning of the parts produced surprising results, and that some prior disclosures were inoperable or clearly different. The Patent Office had cited no adverse reference against Adams, and the Court therefore agreed with the lower court that the patent met the tests for patentability.

Real world impact

The ruling affirms the patent’s validity and supports the inventor’s ability to seek compensation for the Government’s wartime use. It shows that an inventive combination that produces unexpected practical benefits can be patentable even when its parts were individually known. The decision also limits the Government’s ability to defeat patents by arguing mere substitution when the combined device behaves very differently.

Dissents or concurrances

Justice White filed a dissent. Mr. Justice Fortas did not participate.