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Patent applications and USPTO patent grants for Campbell; Joseph M..The latest application filed is for "system for encoding of bass and treble expression effects while recording from the keyboard of an electronic player piano".
Patent | Date |
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System for encoding of bass and treble expression effects while recording from the keyboard of an electronic player piano Grant 4,176,578 - Campbell , et al. December 4, 1 | 1979-12-04 |
Method and apparatus for recording digital signals for actuating solenoid Grant 4,174,652 - Campbell November 20, 1 | 1979-11-20 |
Method and apparatus for encoding of expression while recording from the keyboard of an electronic player piano Grant 4,172,403 - Campbell , et al. October 30, 1 | 1979-10-30 |
Circuit for controlling the expression of an electronically controlled keyboard instrument Grant 4,135,428 - Campbell January 23, 1 | 1979-01-23 |
Method and apparatus for reproducing a musical presentation Grant 4,132,142 - Campbell January 2, 1 | 1979-01-02 |
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