Yup. He's got a lot of patents:
1976-1980
PAT. NO. Title
1 D256,798 Constant distortion volume control unit
2 4,199,233 Feed shuttle mechanism for motion picture film strips
3 4,143,245 Constant distortion volume control
4 4,106,863 Cassette receiving well structure for photographic viewing apparatus
5 4,105,309 Logic system for photographic film strip handling apparatus
6 4,105,307 Programmable viewing system for processing and viewing cassette contained photographic film strips
7 4,083,517 Reversible drive transmission for strip handling systems
8 3,970,377 Sound motion picture processing and projection system
9 3,938,885 Multipurpose audio-visual cassette system
10 3,936,166 Multipurpose audio-visual cassette method
1981-1985
PAT. NO. Title
1 4,489,439 Electronic stereo reverberation device with doubler
2 4,426,907 Automatic tuning device
3 4,420,795 Electronic component mounting
4 D270,153 Speaker volume control
5 4,378,723 String tuning and fastening arrangement
6 4,375,180 Automatic tuning device
7 4,363,934 Volume control device
1986-1990
PAT. NO. Title
1 4,809,337 Audio noise gate
2 4,752,960 Audio processing circuit
3 4,683,589 Electronic audio system
4 4,627,094 Electronic audio signal processor
5 D284,580 Stringed instrument amplifier or the like
6 4,584,700 Electronic audio signal processor
7 4,562,766 String tuning and fastening arrangement
1991-1995
PAT. NO. Title
1 5,133,015 Method and apparatus for processing an audio signal
I wasn't able to search patents before 1976.
Note that just because he has patents doesn't mean he's rich (which is not to say he's not rich). Some of his earlier patents were assigned to Polaroid and some of his later ones were assigned to SR&D.