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COOPER DUANE H

Overview
  • Total Patents
    33
About

COOPER DUANE H has a total of 33 patent applications. Its first patent ever was published in 1965. It filed its patents most often in United States, Canada and Germany. Its main competitors in its focus markets audio-visual technology, telecommunications and basic communication technologies are DESPER PRODUCTS INC, LEXICON and SONICEMOTION AG.

Patent filings in countries

World map showing COOPER DUANE Hs patent filings in countries

Patent filings per year

Chart showing COOPER DUANE Hs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Cooper Duane H 31
#2 Bauck Jerald L 8
#3 Takagi Toshihiko 2
#4 Kamo Yoshihisa 2
#5 Jiyuan Haabaato Kuupaa 1

Latest patents

Publication Filing date Title
US5136651A Head diffraction compensated stereo system
US5034983A Head diffraction compensated stereo system
US4975954A Head diffraction compensated stereo system with optimal equalization
US4910779A Head diffraction compensated stereo system with optimal equalization
US4893342A Head diffraction compensated stereo system
JPS533801A Multichannel matrix logical system and encoding system
US4085291A Synthetic supplementary channel matrix decoding systems
CA1012466A Control of fm beat distortion
CA1008780A Control of fm beat distortion
CA1006824A Signal matrixing for directional reproduction of sound
CA1006828A Signal matrixing for directional reproduction of sound
CA1006829A Signal matrixing for directional reproduction of sound
CA1006832A Signal matrixing for directional reproduction of sound
CA1006831A Signal matrixing for directional reproduction of sound
CA1006830A Signal matrixing for directional reproduction of sound
US3970788A Monaural and stereo compatible multidirectional sound matrixing
US3946165A Method and apparatus for control of crosstalk in multiple frequency recording
US3985978A Method and apparatus for control of FM beat distortion
US3906156A Signal matrixing for directional reproduction of sound
US3559103A Method of delay modulation