Lee; David Q.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Lee; David Q..The latest application filed is for "dial pulse sensor and repeater circuit".
- Lee; David Q. - Boca Raton FL
- Lee; David Q. - Chicago IL
| Patent | Date |
|---|---|
| Dial pulse sensor and repeater circuit Grant 4,230,912 - Lee , et al. October 28, 1 | 1980-10-28 |
| Call for service and continuity sensor circuit Grant 4,190,745 - Jusinskas, Jr. , et al. February 26, 1 | 1980-02-26 |
| AC supervisory signal detector circuit Grant 4,133,982 - Lee , et al. January 9, 1 | 1979-01-09 |
| Detector circuit for sensing battery polarity and loop closure Grant 4,126,765 - Calder , et al. November 21, 1 | 1978-11-21 |
| Conference circuit for pulse coded modulated telephony Grant 4,022,981 - McLaughlin , et al. May 10, 1 | 1977-05-10 |
| Memory operation for 3-way communications Grant 3,967,070 - Srivastava , et al. June 29, 1 | 1976-06-29 |
| Tone injection circuit Grant 3,931,474 - McLaughlin , et al. January 6, 1 | 1976-01-06 |
| Line circuit employing constant current devices for battery feed Grant 3,916,110 - Lee , et al. October 28, 1 | 1975-10-28 |
| Arrangement for controlling a plurality of lamps Grant 3,909,822 - Lee , et al. September 30, 1 | 1975-09-30 |
| Arrangement for controlling the gain of two-way amplifiers in accordance with loop lengths Grant 3,903,378 - Lee , et al. September 2, 1 | 1975-09-02 |
| Ring Trip And Dial Pulse Detection Circuit Grant 3,838,223 - Lee , et al. September 24, 1 | 1974-09-24 |
| Junctor Disconnect Detection Circuit Grant 3,838,228 - Lee , et al. September 24, 1 | 1974-09-24 |
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