https://patentbrief.org/company/zenith-radio-corp Plain-English explanations of patents assigned to Zenith Radio Corp, newest first. en-us Sat, 13 Jun 2026 10:10:58 GMT https://patentbrief.org/patent/us/2817025/tv-remote-control-adler-zenith Robert Adler's 1957 invention of the Space Command remote, which used ultrasonic sound waves to control television functions without wires or batteries. Tue, 17 Dec 1957 00:00:00 GMT https://patentbrief.org/patent/us/2817025/tv-remote-control-adler-zenith