Patent US3712994A successfully refreshed from Google Patents.
US3712994A
Expired / Lapsed
US
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Automatic time control circuit
Assignee: International Standard Electric Corp
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Filing: 1971-07-20
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Granted: 1973-01-23
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Expires: 1991-07-20
Abstract
Abstract THIS INVENTION RELATES TO AN AUTOMATIC TIME CONTROL CIRCUIT. THE TIME DELAY OF AN ADJUSTABLE TIME DELAY CIRCUIT IS CONTROLLED BY AN ERROR VOLTAGE WHICH IS DERIVED FROM THE CONTINUOUS COMPARISON OF THE TIME DELAY WITH ANOTHER TIME OBTAINED FROM A VERY STABLE SOURCE SUCH AS A CRYSTAL OSCILLATOR.
Inventors
- 👤 D Graziani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:39
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/13; H03K5/135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |