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Duane H. Cooper
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Champaign, IL, US
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last 30 patents
Information
Patent Grant
Head diffraction compensated stereo system with loud speaker array
Patent number
5,333,200
Issue date
Jul 26, 1994
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Head diffraction compensated stereo system
Patent number
5,136,651
Issue date
Aug 4, 1992
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Head diffraction compensated stereo system
Patent number
5,034,983
Issue date
Jul 23, 1991
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Head diffraction compensated stereo system with optimal equalization
Patent number
4,975,954
Issue date
Dec 4, 1990
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Head diffraction compensated stereo system with optimal equalization
Patent number
4,910,779
Issue date
Mar 20, 1990
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Head diffraction compensated stereo system
Patent number
4,893,342
Issue date
Jan 9, 1990
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal matrixing for directional reproduction of sound
Patent number
4,236,039
Issue date
Nov 25, 1980
National Research Development Corporation
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Multichannel matrix logic and encoding systems
Patent number
4,149,031
Issue date
Apr 10, 1979
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Synthetic supplementary channel matrix decoding systems
Patent number
4,085,291
Issue date
Apr 18, 1978
Duane H. Cooper
G11 - INFORMATION STORAGE
Information
Patent Grant
Method and apparatus for control of FM beat distortion
Patent number
3,985,978
Issue date
Oct 12, 1976
Duane H. Cooper
G11 - INFORMATION STORAGE
Information
Patent Grant
Monaural and stereo compatible multidirectional sound matrixing
Patent number
3,970,788
Issue date
Jul 20, 1976
Duane H. Cooper
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method and apparatus for control of crosstalk in multiple frequency...
Patent number
3,946,165
Issue date
Mar 23, 1976
Duane H. Cooper
G11 - INFORMATION STORAGE