Electronic shut-off timers
Abstract
Abstract ELECTRONIC SWITCHES CONTROLLED BY RC TIMING CIRCUITS FOR COMBINATION WITH A RADIO OR THE LIKE TO PROVIDE TIMED PLAY PERIODS OF THE RADIO. IN ONE EMBODIMENT THE SWITCH COMPRISES A SEMICONDUCTOR HAVING ITS PRINCIPAL CONDUCTING ELEMENTS CONNECTED IN SERIES WITH THE LOW VOLTAGE RECEIVER STAGES AND LOW VOLTAGE POWER SUPPLY OF A RADIO. AN RC TIMING CIRCUIT IS COUPLED TO THE CONTROL ELECTRODE OF THE SEMI-CONDUCTOR TO TURN IT OFF AFTER A TIMED INTERVAL FROM ITS TURN ON TIME. IN A SECOND EMBODIMENT THE ELECTRONIC SWITCH COMPRISES A SEMICONDUCTOR HAVING ITS PRINCINPAL CONDUCTING ELECTRODES COUPLED BETWEEN THE LOW VOLTAGE POWER SUPPLY AND THE AUTIO INPUT TO THE VOLUME CONTROL POTENTIOMETER OF THE RECEIVER. AGAIN, AN RC TIMING CIRCUIT IS COUPLED TO CONTROL CONDUCTION OF THE SEMICONDUCTOR WHICH SHORTS OUT THE AUDIO SIGNAL AFTER A TIMED INTERVAL.
Inventors
- 👤 Elden R Davisson
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |