US3100097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for hot box detection
Assignee: Siemens and Halske AG
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Filing: 1959-12-09
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Granted: 1963-08-06
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Expires: 1979-12-09
Abstract
No abstract record available.
Inventors
- 👤 Friedrich W Woltersdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:37
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/04; B61K9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
148 words
A HOT BOX DETECTING SYSTEM COMPRISING A PAIR OF HEAT SENSOR MEANS ADAPTED TO BE MOUNTED ON OPPOSITE SIDES OF A RAILROAD TRACK AND FURTHER ADAPTED TO PRODUCE FIRST AND SECOND ELECTRICAL SIGNALS IN RESPONSE TO INCIDENT RADIANT ENERGY EMITTED BY PASSING JOURNAL BOXES, ELECTRICAL DIFFERENCE-DETERMINING MEANS COUPLED TO SAID FIRST AND SECOND SIGNALS TO PROVIDE A THIRD SIGNAL COMMENSURATE WITH THE DIFFERENCE IN MAGNITUDE BETWEEN SAID FIRST AND SECOND SIGNALS, ELECTRICAL ADDING MEANS COUPLED TO SAID FIRST AND SECOND SIGNALS TO PROVIDE A FOURTH SIGNAL COMMENSURATE WITH THE SUM OF SAID FIRST AND SECOND SIGNALS, ELECTRICAL RATIO FORMING MEANS RESPONSIVE TO SAID THIRD AND FOURTH SIGNALS AND OPERATIVE TO PROVIDE A FIFTH SIGNAL COMMENSURATE WITH THE RATIO BETWEEN SAID THIRD AND FOURTH SIGNALS, AND MEANS RESPONSIVE TO SAID FIFTH SIGNAL TO PROVIDE AN OUTPUT INDICATION WHENEVER THE MAGNITUDE OF SAID FIFTH SIGNAL EXCEEDS A PREDETERMINED THRESHOLD MAGNITUDE.
References Cited (Backward Citations)
US2809290A
Cited
US2963575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-05 | 1967-02-04 | 1967-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-05 | 1971-02-04 | 1971-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-05 | 1975-02-04 | 1975-08-06 | $7700.00 | Window Closed / Lapsed |