Patent US3588857A successfully refreshed from Google Patents.
US3588857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail safe monitor
Assignee: Bendix Corp
•
Filing: 1967-11-24
•
Granted: 1971-06-28
•
Expires: 1987-11-24
Abstract
Abstract A FAIL SAFE MONITOR INCLUDING AN AMPLITUDE DETECTOR WITHIN AN OSCILLATOR LOOP. A SIGNAL CORRESPONDING TO THE DIFFERENCE BETWEEN A PAIR OF REDUNDANT SIGNALS IS COMPARED TO A REFERENCE SIGNAL. IF THE DIFFERENCE SIGNAL EXCEEDS A PREDETERMINED THRESHOLD, THE OSCILLATOR WILL STOP AND THEREBY CAUSE AN ALARM DEVICE TO BE ACTUATED. IF THE DIFFERENCE SIGNAL IS LESS THAN THE THRESHOLD, THE OSCILLATOR WILL CONTINUE TO OSCILLATE AND THE COMPARATOR WILL BE IN THE SAFE STATE. THE COMPARATOR HAS INDEPENDENT DUAL OUTPUTS SO THAT IN THE VENT OF A FAILURE OF ONE OUTPUT, THE OTHER OUTPUT FUNCTIONS NORMALLY.
Inventors
- 👤 Gunter J Gessner
- 👤 Donald P Vargo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:26
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H03K5/082; G; G05; G05B; G05B9/00; G05B9/02; H03K5/22; H03K5/24
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |