In that same year, 1965, he officially invented the Dolby Sound System, a form of electronic filter, although his first U.S. patent was not filed until 1969, four years later.
He officially invented the Dolby Sound System. This was in that same year. His first U.S. patent was not filed until 1969. This was four years later. The Dolby Sound System was a form of electronic filter. That same year was 1965.