Patent US3721833A successfully refreshed from Google Patents.
US3721833A
Expired / Lapsed
US
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Electronic incidence and coincidence safety control circuit
Assignee: Branson Ultrasonics Corp
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Filing: 1971-08-30
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Granted: 1973-03-20
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Expires: 1991-08-30
Abstract
Abstract AN ELECTRONIC SAFETY CONTROL CIRCUIT IS DESCRIBED WHEREIN INPUT SIGNALS FOR INITIATING THE OPERATION OF EQUIPMENT MUST OCCUR WITHIN A PREDETERMINED TIME OF ONE ANOTHER. A PAIR OF DELAY CIRCUITS ARE EMPLOYED WHICH ARE ENERGIZED IN RESPONSE TO SWITCH CLOSURES. ONE OF THE DELAYS IS CONNECTED TO DELAY EQUIPMENT OPERATION UNTIL THE CIRCUITRY HAS DECIDED WHETHER THE INPUT SIGNALS OCCURRED WITHIN THE TIME PERIOD SET BY THE OTHER DELAY. A FAILURE OF THE INPUT SIGNALS TO OCCUR DURING THE PRESCRIBED TIME PREVENTS EQUIPMENT OPERATION. D R A W I N G
Inventors
- 👤 G Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:53
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/26
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |