MIDI MUSIC CENTER, INC., A CORP. OF CA

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D282850 Keyboard musical instrument or similar articleExpiredJul 28, 83Mar 04, 86[]
4481851 Tone generator assignment system for an electronic musical instrumentExpiredJun 22, 81Nov 13, 84[G10H]
4475427 Frequency independent ramp generatorExpiredAug 10, 81Oct 09, 84[G10H]
4467689 Chord recognition techniqueExpiredJun 22, 82Aug 28, 84[G10F]
4442745 Long duration aperiodic musical waveform generatorExpiredApr 28, 80Apr 17, 84[G10H]
4412471 Synchronization system for an electronic musical instrument having plural automatic play featuresExpiredJun 22, 82Nov 01, 83[G10F]
4375176 Keyboard latch for electronic organExpiredJun 04, 80Mar 01, 83[G10H]
4374482 Vocal effect for musical instrumentExpiredDec 23, 80Feb 22, 83[G10H]
4364297 Keyboard spring return mechanismExpiredMar 24, 80Dec 21, 82[G10C]
4361738 Key-actuated switchExpiredJun 04, 80Nov 30, 82[H01H]
4343216 Serial interface circuit for an electronic musical instrumentExpiredJun 09, 80Aug 10, 82[G10F, G10B]
4342245 Complex waveform generator for musical instrumentExpiredFeb 27, 81Aug 03, 82[G10H]
4333376 Apparatus for reinforcing notes selected by more than one keyExpiredMay 16, 80Jun 08, 82[G10H]
4330751 Programmable frequency and duty cycle tone signal generatorExpiredDec 03, 79May 18, 82[H03K]
4326260 Linear piecewise waveform generator for an electronic musical instrumentExpiredJul 07, 80Apr 20, 82[G06F]
4322996 Alternating repeat keying signal generatorExpiredApr 16, 80Apr 06, 82[G10H]
4267579 Digital waveform generator having constant signal to noise ratioExpiredJul 13, 79May 12, 81[G06F]
4259888 Tone generation system employing triangular wavesExpiredDec 06, 79Apr 07, 81[G10H]
4248130 Keyboard assemblyExpiredAug 24, 78Feb 03, 81[G10C]
4244260 Footage volume control circuitExpiredDec 28, 78Jan 13, 81[G10H]

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