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Patent applications and USPTO patent grants for Parker; Rollin James.The latest application filed is for "moving magnet electroacoustic transducer".
Patent | Date |
---|---|
Moving magnet electroacoustic transducer Grant 3,937,904 - Parker February 10, 1 | 1976-02-10 |
Permanent Magnet Motor Grant 3,836,802 - Parker September 17, 1 | 1974-09-17 |
Movable Magnet Loudspeaker Grant 3,798,391 - Parker March 19, 1 | 1974-03-19 |
Magnetic Latch Grant 3,790,197 - Parker February 5, 1 | 1974-02-05 |
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