US3253099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic proximity detector
Assignee: Westinghouse Air Brake Co
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Filing: 1963-12-19
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Granted: 1966-05-24
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Expires: 1983-12-19
Abstract
No abstract record available.
Inventors
- 👤 Richard C Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:21
CPC Classifications
B; B61; B61L; B61L1/00; B61L1/16; B61L1/163; B61L1/165; H; H01; H01H; H01H36/00; H01H36/0006; H01H36/0013; H01H36/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A MAGNETIC PROXIMITY DETECTOR FOR INDICATING THE PRESENCE OF A MAGNETICALLY PERMEABLE OBJECT WITHIN A PREDETERMINED AREA, SAID DETECTOR COMPRISING AN ELECTRICAL CIRCUIT MEANS NORMALLY IN ONE CONDITION, MEANS COUPLED TO SAID CIRCUIT MEANS AND EFFECTIVE WHILE A MAGNETICALLY PERMEABLE OBJECT IS WITHIN SAID PREDETERMINED AREA TO CAUSE SAID ELECTRICAL CIRCUIT MEANS TO CHANGE TO AN OTHER CONDITION, AND ELECTROMAGNETIC MEANS ELECTRICALLY COUPLED TO SAID CIRCUIT MEANS AND EFFECTIVE ONLY WHILE SAID ELECTRICAL CIRCUIT MEANS IN SAID OTHER CONDITION TO TEND TO RESTORE SAID CIRCUIT MEANS TO ITS ONE CONDITION.
Claim 2
Dependent Claim
90 words
A MAGNETIC PROXIMITY DETECTOR FOR INDICATING THE PRESENCE OF A MAGNETICALLY PERMEABLE OBJECT WITHIN A PREDETERMINED AREA, SAID DETECTOR COMPRISING AN ELECTRICAL CIRCUIT MEANS NORMALLY IN ONE CONDITION, MEANS COUPLED TO SAID CIRCUIT MEANS AND EFFECTIVE WHILE A MAGNETICALLY PERMEABLE OBJECT IS WITHIN SAID PREDETERMINED AREA TO CAUSE SAID ELECTRICAL CIRCUIT MEANS TO CHANGE TO AN OTHER CONDITION, AND ELECTROMAGNETIC MEANS ELECTRICALLY COUPLED TO SAID CIRCUIT MEANS AND EFFECTIVE ONLY WHILE SAID ELECTRICAL CIRCUIT MEANS IN SAID OTHER CONDITION TO TEND TO RESTORE SAID CIRCUIT MEANS TO ITS ONE CONDITION.
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) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |