Assignee
COOPER DUANE H
12 granted patents·458 citations·filing 1974–1992
Top patents by PatentIndex Score
12 records- 0192US5333200AHead diffraction compensated stereo system with loud speaker arrayCOOPER DUANE H·Filed 1992·Granted Jul 26, 1994·112 cites·50 claims
- 0291US4910779AHead diffraction compensated stereo system with optimal equalizationCOOPER DUANE H·Filed 1988·Granted Mar 20, 1990·82 cites·14 claims
- 0386US4975954AHead diffraction compensated stereo system with optimal equalizationCOOPER DUANE H·Filed 1989·Granted Dec 4, 1990·59 cites·11 claims
- 0486US4893342AHead diffraction compensated stereo systemCOOPER DUANE H·Filed 1987·Granted Jan 9, 1990·49 cites·20 claims
- 0581US5136651AHead diffraction compensated stereo systemCOOPER DUANE H·Filed 1991·Granted Aug 4, 1992·59 cites·10 claims
- 0679US5034983AHead diffraction compensated stereo systemCOOPER DUANE H·Filed 1989·Granted Jul 23, 1991·36 cites·59 claims
- 0775US4149031AMultichannel matrix logic and encoding systemsCOOPER DUANE H·Filed 1977·Granted Apr 10, 1979·22 cites·2 claims
- 0860US3946165AMethod and apparatus for control of crosstalk in multiple frequency recordingCOOPER DUANE H·Filed 1974·Granted Mar 23, 1976·9 cites·13 claims
- 0954US4085291ASynthetic supplementary channel matrix decoding systemsCOOPER DUANE H·Filed 1976·Granted Apr 18, 1978·10 cites·14 claims
- 1054US3970788AMonaural and stereo compatible multidirectional sound matrixingCOOPER DUANE H·Filed 1975·Granted Jul 20, 1976·10 cites·7 claims
- 1144US3989903AMulti-directional sound signal recording and/or reproducing system with crosstalk compensation meansCOOPER DUANE H·Filed 1974·Granted Nov 2, 1976·6 cites·11 claims
- 1239US3985978AMethod and apparatus for control of FM beat distortionCOOPER DUANE H·Filed 1974·Granted Oct 12, 1976·4 cites·16 claims
Join the waitlist — get patent alerts
Get an alert when COOPER DUANE H files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →