PATENTS

Sound Recording
#5,820,384 - October, 1998

Acoustical Prompt Recording System and Method
#5,569,038 - October, 1996

Protection System for AC Generators
#5,206,776 - April, 1993

Method and System for Synchronization of an Auxiliary Sound Source to Motion Picture, Film, Video Tape, or Other Picture Source Containing a Sound Track.
#4,839.733, 13 - June, 1989

Adaptive Expanders for FM Stereophonic Broadcasting System Utilizing Companding of Difference Siginal
#4,602,381, 22 - July, 1986

Apparatus for Cutting Audio Discs
#4,157,460, 5 - June, 1979

Printed Sound Track System
#3,970,803, 20 - July, 1976

Apparatus and Method for Decoding Four Channel Sound
#3,943,287, 9 - March, 1976

System for Reproducing Four Channel Signals Recorded on a Disc Record
#3,883,700, 13 - May, 1975

Quadraphonic Disc Recording System Utilizing Single Sideband Modulation
#3,869,683, 4 - March, 1975

Quadraphonic Recording System
#3,794,780, 26 - February, 1974

Quadraphonic Reproducing System with Gain Control
#3,708,631, 2 - January, 1973