Patent US3108772A successfully refreshed from Google Patents.
US3108772A
Expired / Lapsed
US
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Hot-box detector alarm circuit
Assignee: Servo Corp of America
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Filing: 1960-03-14
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Granted: 1963-10-29
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Expires: 1980-03-14
Abstract
No abstract record available.
Inventors
- 👤 William M Pelino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:50
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/04; B61K9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
A HOT-BOX DETECTING SYSTEM COMPRISING PLURAL HEAT SENSOR MEANS TO PRODUCE ELECTRICAL SIGNALS RESPECTIVELY IN RESPONSE TO INCIDENT RADIANT ENERGY AND ADAPTED TO BE MOUNTED ON OPPOSITE SIDES OF A RAILROAD TRACK, RATIO FORMING MEANS COUPLED TO THE RESPECTIVE OUTPUTS OF SAID PLURAL HEAT SENSOR MEANS TO DEVELOP AN ELECTRICAL POTENTIAL IN RESPONSE TO THE RATIO OF ELECTRICAL SIGNALS FROM A PAIR OF SAID HEAT SENSOR MEANS WHEN SAID RATIO EXCEEDS A PREDETERMINED THRESHOLD, AND MEANS RESPONSIVE TO SAID RATIO MEANS TO PRODUCE AN INDICATION WHEN SAID PREDETERMINED THRESHOLD IS ATTAINED.
References Cited (Backward Citations)
DE1031338B
Cited
US2963575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |