Beirne; Patrick R.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Beirne; Patrick R..The latest application filed is for "dial tone detector".
- Beirne; Patrick R. - Kanata Ontario CA
- Beirne; Patrick R. - Stittsville CA
| Patent | Date |
|---|---|
| Dial tone detector Grant 4,747,131 - Beirne May 24, 1 | 1988-05-24 |
| Digital tone detector Grant 4,694,482 - Reesor , et al. September 15, 1 | 1987-09-15 |
| Digital tone detector Grant 4,669,114 - Reesor , et al. May 26, 1 | 1987-05-26 |
| Subscriber line interface circuit Grant 4,540,854 - Beirne September 10, 1 | 1985-09-10 |
| Subscriber line interface circuit Grant 4,472,608 - Beirne September 18, 1 | 1984-09-18 |
| Power saving line circuit Grant 4,410,766 - Beirne October 18, 1 | 1983-10-18 |
| Keyless and indicatorless local telephone switching system Grant 4,376,875 - Beirne March 15, 1 | 1983-03-15 |
| Trunk circuit with single coupling transformer Grant 4,321,431 - Beirne , et al. * March 23, 1 | 1982-03-23 |
| Telephone line circuit Grant 4,281,219 - Cowpland , et al. July 28, 1 | 1981-07-28 |
| Tone decoding circuit Grant 4,273,965 - Cowpland , et al. June 16, 1 | 1981-06-16 |
| Switching matrix Grant 4,245,214 - Beirne January 13, 1 | 1981-01-13 |
| Transformerless trunk circuit Grant 4,182,936 - Beirne , et al. January 8, 1 | 1980-01-08 |
| Transformerless telephone line circuit Grant 4,178,485 - Cowpland , et al. December 11, 1 | 1979-12-11 |
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