US3407340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail-safe time delay relay
Assignee: Westinghouse Air Brake Co
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Filing: 1966-06-14
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Granted: 1968-10-22
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Expires: 1986-06-14
Abstract
No abstract record available.
Inventors
- 👤 Hufnagel Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:33
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
223 words
A FAIL-SAFE SOLID STATE TIME ELEMENT RELAY WHICH IS IMMUNE TO RELAY PICKUP DUE TO EARLY TRIGGERING, SAID TIME DELAY RELAY CAPABLE OF ADJUSTABLE TIME INTERVALS FOLLOWED BY QUICK RELAY PICKUP AT THE END OF SAID TIME INTERVALS, SAID TIME ELEMENT RELAY HAVING IN COMBINATION: (1) AN EXTERNALLY CONTROLLED DIRECT CURRENT VOLTAGE SOURCE, (2) SOLID STATE RELAY ENERGIZATION CONTROL MEANS, (3) A PREDETERMINED TIME RELAY VOLTAGE STORAGE MEANS ELECTRICALLY CONNECTED TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS, (4) A SAFETY VOLTAGE STORAGE MEANS ELECTRICALLY CONNECTED BETWEEN SAID DIRECT CURRENT VOLTAGE SOURCE AND SAID PREDETERMINED TIME DELAY VOLTAGE STORAGE MEANS, SAID VOLTAGE STORAGE MEANS SOTRING ENERGY FROM SAID DIRECT CURRENT VOLTAGE SOURCE TO THEREBY PROVIDE A STANDBY REFERENCE VOLTAGE TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS. (5) AN EXCESS VOLTAGE DRAINOFF MEANS FOR SAID PREDETERMINED TIME DELAY VOLTAGE STORAGE MEANS ELECTRICALLY CONNECTED TO SAID PREDETERMINED TIME DELAY VOLTAGE STORAGE MEANS, (6) REFERENCE VOLTAGE CONTROL MEANS ELECTRICALLY CONNECTED TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS. (7) A RELAY ELECTRICALLY CONNECTED TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS, (8) A BYPASS MEANS FOR SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS AND SAID REFERENCE VOLTAGE CONTROL MEANS, SAID BYPASS MEANS ELECTRICALLY CONNECTED TO SAID DIRECT CURRENT VOLTAGE SOURCE AND CONTROLLED BY SAID RELAY TO PROVIDE A BYPASS CIRCUIT TO MAINTAIN SAID RELAY ENERGIZED.
Claim 2
Dependent Claim
223 words
A FAIL-SAFE SOLID STATE TIME ELEMENT RELAY WHICH IS IMMUNE TO RELAY PICKUP DUE TO EARLY TRIGGERING, SAID TIME DELAY RELAY CAPABLE OF ADJUSTABLE TIME INTERVALS FOLLOWED BY QUICK RELAY PICKUP AT THE END OF SAID TIME INTERVALS, SAID TIME ELEMENT RELAY HAVING IN COMBINATION: (1) AN EXTERNALLY CONTROLLED DIRECT CURRENT VOLTAGE SOURCE, (2) SOLID STATE RELAY ENERGIZATION CONTROL MEANS, (3) A PREDETERMINED TIME RELAY VOLTAGE STORAGE MEANS ELECTRICALLY CONNECTED TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS, (4) A SAFETY VOLTAGE STORAGE MEANS ELECTRICALLY CONNECTED BETWEEN SAID DIRECT CURRENT VOLTAGE SOURCE AND SAID PREDETERMINED TIME DELAY VOLTAGE STORAGE MEANS, SAID VOLTAGE STORAGE MEANS SOTRING ENERGY FROM SAID DIRECT CURRENT VOLTAGE SOURCE TO THEREBY PROVIDE A STANDBY REFERENCE VOLTAGE TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS. (5) AN EXCESS VOLTAGE DRAINOFF MEANS FOR SAID PREDETERMINED TIME DELAY VOLTAGE STORAGE MEANS ELECTRICALLY CONNECTED TO SAID PREDETERMINED TIME DELAY VOLTAGE STORAGE MEANS, (6) REFERENCE VOLTAGE CONTROL MEANS ELECTRICALLY CONNECTED TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS. (7) A RELAY ELECTRICALLY CONNECTED TO SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS, (8) A BYPASS MEANS FOR SAID SOLID STATE RELAY ENERGIZATION CONTROL MEANS AND SAID REFERENCE VOLTAGE CONTROL MEANS, SAID BYPASS MEANS ELECTRICALLY CONNECTED TO SAID DIRECT CURRENT VOLTAGE SOURCE AND CONTROLLED BY SAID RELAY TO PROVIDE A BYPASS CIRCUIT TO MAINTAIN SAID RELAY ENERGIZED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |