De Forest Radio Telephone Co. v. United States

Background

A radio-parts company called the De Forest Radio Telephone & Telegraph Company sued the United States, saying the Government unlawfully used patented vacuum tubes called audions during the war. The suit relied on federal laws that let patent owners recover compensation when the Government used or made patented inventions without a license. The petition described assignments and licenses involving Western Electric and the American Telephone & Telegraph Company and said the Government ordered manufacturers like General Electric and Moorhead Laboratories to make audions for wartime use.

Reasoning

The key question was whether the telephone company’s words and conduct were a license allowing the Government’s manufacture and use, or whether the Government’s acts were a wrongful taking for which De Forest could recover. The Court found the telephone company not only said it would not interfere but also aided production by providing drawings, blueprints, and access for experts to study manufacture. The Court concluded that this consent and assistance amounted to a license, making De Forest’s claim contractual rather than a tort, and affirmed dismissal of the petition.

Real world impact

The ruling means that when a party with patent rights actively assists or consents to the Government’s production, that conduct can prevent a separate owner from winning damages. It shows no formal written license is required; helpful words and actions can create an effective license. The result protected the Government and manufacturers who acted on the telephone company’s consent during war production.