Crystal controlled electric clock
Abstract
Abstract A CRYSTAL CONTROLLED VOLTAGE SOURCE IN COMBINATION WITH AN ELECTRIC CLOCK WHICH PROVIDES A HIGH ACCURACY TIME PIECE FOR USE WITH MOBILE AND REMOTELY LOCATED ELECTRICAL POWER SOURCES. THE DEVICE USES A D.C. VOLTAGE SUPPLY POWERED FROM AN ALTERNATING VOLTAGE SOURCE WHICH MAY BE SUBJECT TO FREQUENCY FLUCTUATIONS. THE D.C. OUTPUT VOLTAGE ENERGIZES A CRYSTAL OSCILLATOR WHICH GENERATES A HIGH FREQUENCY SQUARE WAVE. INTEGRATED DIVIDER CIRCUITS DIVIDE DOWN THE HIGH FREQUENCY SQUARE WAVE TO 60 HERTZ WHICH IS FILTERED AND AMPLIFIED THEREBY PRODUCING AN ALTERNATING VOLTAGE SOURCE HAVING A FREQUENCY STABILIZED SINE WAVESHAPE OUTPUT. THE ELECTRIC CLOCK IS OPERATED FROM THIS VOLTAGE SOURCE TO PROVIDE A HIGHLY ACCURATE DISPLAY OF TIME.
Inventors
- 👤 John E Harris
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |