Cooper; Duane H.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Cooper; Duane H..The latest application filed is for "head diffraction compensated stereo system with loud speaker array".

Company Profile

0.10.0

Cooper; Duane H. - Champaign IL

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Head diffraction compensated stereo system with loud speaker array Grant 5,333,200 - Cooper , et al. July 26, 1	1994-07-26
Head diffraction compensated stereo system Grant 5,136,651 - Cooper , et al. * August 4, 1	1992-08-04
Head diffraction compensated stereo system with optimal equalization Grant 4,975,954 - Cooper , et al. * December 4, 1	1990-12-04
Head diffraction compensated stereo system with optimal equalization Grant 4,910,779 - Cooper , et al. March 20, 1	1990-03-20
Head diffraction compensated stereo system Grant 4,893,342 - Cooper , et al. January 9, 1	1990-01-09
Signal matrixing for directional reproduction of sound Grant 4,236,039 - Cooper * November 25, 1	1980-11-25
Method and apparatus for control of FM beat distortion Grant 3,985,978 - Cooper October 12, 1	1976-10-12
Monaural and stereo compatible multidirectional sound matrixing Grant 3,970,788 - Cooper July 20, 1	1976-07-20
Signal matrixing for directional reproduction of sound Grant 3,906,156 - Cooper September 16, 1	1975-09-16
Multidirectional Sound Reproduction Grant 3,856,992 - Cooper December 24, 1	1974-12-24

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