Patent US3263074A successfully refreshed from Google Patents.
US3263074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway track circuit apparatus
Assignee: Westinghouse Air Brake Co
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Filing: 1962-12-19
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Granted: 1966-07-26
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Expires: 1982-12-19
Abstract
No abstract record available.
Inventors
- 👤 Clifford D Ihrig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:08
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/221; B61L3/222; B61L1/00; B61L1/18; B61L1/181; B61L1/187
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
RAILWAY TRACK CIRCUIT APPARATUS COMPRISING, IN COMBINATION: (A) A SECTION OF RAILWAY TRACK OVER WHICH TRAINS TRAVEL IN A PREDETERMINED DIRECTION, (B) AS SOURCE OF ALTERNATING CURRENT CONNECTED ACROSS THE RAILS AT THE ENTRANCE END OF SAID SECTION, (C) AN ALTERNATING CURRENT TRACK RELAY, (D) TRANSFORMER MEANS HAVING A PRIMARY WINDING AND A PLURALITY OF SECONDARY WINDINGS, (E) MEANS INCLUDING A BACK CONTACT OF SAID TRACK RELAY FOR SUPPLYING CODED ALTERNATING CURRENT FROM SAID SOURCE TO SAID PRIMARY WINDING, (F) CIRCUIT MEANS INCLUDING A FIRST SELECTED GROUP OF SAID SECONDARY WINDINGS CONNECTED ACROSS THE RAILS AT THE EXIT END OF SAID TRACK SECTION FOR SUPPLYING CODED ALTERNATING CURRENT TO SAID RAILS WHEN SAID RELAY IS DEENERGIZED, AND (G) OTHER CIRCUIT MEANS INCLUDING A SECOND SELECTED GROUP OF SAID SECONDARY WINDINGS FOR CONNECTING SAID RELAY ACROSS THE RAILS AT SAID EXIT END SO THAT SAID RELAY RESPONDS ONLY TO CURRENT SUPPLIED FROM SAID ALTERNATING CURRENT SOURCE AT SAID ENTRANCE END.
Claim 2
Dependent Claim
159 words
RAILWAY TRACK CIRCUIT APPARATUS COMPRISING, IN COMBINATION: (A) A SECTION OF RAILWAY TRACK OVER WHICH TRAINS TRAVEL IN A PREDETERMINED DIRECTION, (B) AS SOURCE OF ALTERNATING CURRENT CONNECTED ACROSS THE RAILS AT THE ENTRANCE END OF SAID SECTION, (C) AN ALTERNATING CURRENT TRACK RELAY, (D) TRANSFORMER MEANS HAVING A PRIMARY WINDING AND A PLURALITY OF SECONDARY WINDINGS, (E) MEANS INCLUDING A BACK CONTACT OF SAID TRACK RELAY FOR SUPPLYING CODED ALTERNATING CURRENT FROM SAID SOURCE TO SAID PRIMARY WINDING, (F) CIRCUIT MEANS INCLUDING A FIRST SELECTED GROUP OF SAID SECONDARY WINDINGS CONNECTED ACROSS THE RAILS AT THE EXIT END OF SAID TRACK SECTION FOR SUPPLYING CODED ALTERNATING CURRENT TO SAID RAILS WHEN SAID RELAY IS DEENERGIZED, AND (G) OTHER CIRCUIT MEANS INCLUDING A SECOND SELECTED GROUP OF SAID SECONDARY WINDINGS FOR CONNECTING SAID RELAY ACROSS THE RAILS AT SAID EXIT END SO THAT SAID RELAY RESPONDS ONLY TO CURRENT SUPPLIED FROM SAID ALTERNATING CURRENT SOURCE AT SAID ENTRANCE END.
References Cited (Backward Citations)
US1861077A
Cited
US2371568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |