https://patentbrief.org/company/forest-radio-telephone-co-de Plain-English explanations of patents assigned to FOREST RADIO TELEPHONE CO DE, newest first. en-us Sat, 13 Jun 2026 10:16:30 GMT https://patentbrief.org/patent/us/879532/de-forest-audion-vacuum-tube A 1908 patent by radio pioneer Lee De Forest describing methods for transmitting and receiving wireless telegraphy signals using early vacuum tube technology. Tue, 18 Feb 1908 00:00:00 GMT https://patentbrief.org/patent/us/879532/de-forest-audion-vacuum-tube