US3560864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage to pulse frequency converter
Assignee: Shell USA Inc
•
Filing: 1967-11-24
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Granted: 1971-02-02
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Expires: 1987-11-24
Abstract
Abstract A METHOD AND APPARATUS FOR GENERATING A PULSE FREQUENCY PROPORTIONAL TO THE RATIO OF THE AMPLITUDE OF TWO INPUT SIGNALS CONSISTING OF AN INTEGRATOR, SCHMITT TRIGGER, CAPACITOR AND NON-LOADING FEEDBACK CIRCUIT THROUGH WHICH THE CAPACITOR MAY BE DISCHARGED INTO THE INTEGRATOR.
Inventors
- 👤 Hendrikus J Nihof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:10
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/124
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |