Patent US4236783A successfully refreshed from Google Patents.
Patent US3555418A successfully refreshed from Google Patents.
US3555418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillator having voltage sensitive capacitors therein and calibration circuit means
Assignee: OPSEIS Inc
•
Filing: 1967-09-29
•
Granted: 1971-01-12
•
Expires: 1987-09-29
Abstract
Abstract A VOLTAGE TO FREQUENCY CIRCUIT IS PROVIDED, WHICH UTILIZES AN OSCILLATOR HAVING A VOLTAGE SENSITIVE CAPACITOR THEREIN. MEANS ARE PROVIDED FOR CHECING THE SPAN OF THE CIRCUIT PERIODICALLY AND FOR TRANSMITTING THE SPAN CHECK SIGNALS TO A COMPUTER. THE OSCILLATOR INPUT CIRCUIT IS DESIGNED TO ELIMINATE DIRECT CURRENT PATHS TO GROUND.
Inventors
- 👤 Dale A Fluegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:42
CPC Classifications
G; G01; G01R; G01R17/00; H; H03; H03K; H03K7/00; H03K7/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |