https://patentbrief.org/company/electro-string-instr-corp Plain-English explanations of patents assigned to ELECTRO STRING INSTR CORP, newest first. en-us Sat, 13 Jun 2026 10:06:18 GMT https://patentbrief.org/patent/us/2089171/electric-guitar-frying-pan George Beauchamp's 1937 patent for the first commercially successful electric guitar, which used a magnetic pickup to turn string vibrations into electrical signals. Tue, 10 Aug 1937 00:00:00 GMT https://patentbrief.org/patent/us/2089171/electric-guitar-frying-pan