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Patent applications and USPTO patent grants for Percival; Dan M..The latest application filed is for "voice/data switch".
Patent | Date |
---|---|
Voice/data switch Grant 4,821,312 - Horton , et al. April 11, 1 | 1989-04-11 |
Premises page/intercom system utilizing telephone set component Grant 4,754,476 - Rasmussen , et al. June 28, 1 | 1988-06-28 |
Telephone set line status display Grant 4,653,094 - Rasmussen , et al. March 24, 1 | 1987-03-24 |
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