Patent US3108771A successfully refreshed from Google Patents.
US3108771A
Expired / Lapsed
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Shunting aid for railway signalling circuits
Assignee: Servo Corp of America
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Filing: 1957-01-25
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Granted: 1963-10-29
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Expires: 1977-01-25
Abstract
No abstract record available.
Inventors
- 👤 William M Pellino
- 👤 Cornelius A Gallagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:10
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/163; B61L23/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN COMBINATION, A RAILWAY BLOCK-SIGNALLING CIRCUIT COMPRISING TWO ELECTRICALLY INSULATED SPACED RAILS OF SECTION LENGTH, A VOLTAGE SOURCE CONTINUOUSLY CONNECTED TO SAID RAILS AT ONE END OF SAID LENGTH, A SIGNAL RELAY HAVING A WINDING ENERGIZED FROM AND CONTINUOUSLY CONNECTED ACROSS SAID RAILS AT THE OTHER END OF SAID LENGTH, A MAGNETIC WHEEL TRIP RESPONSIVE TO THE PASSAGE OF A WHEEL FLANGE NEAR ONE OF SAID ENDS AND DEVELOPING A VOLTAGE PULSE AT THE
Claim 2
Dependent Claim
74 words
IN COMBINATION, A RAILWAY BLOCK-SIGNALLING CIRCUIT COMPRISING TWO ELECTRICALLY INSULATED SPACED RAILS OF SECTION LENGTH, A VOLTAGE SOURCE CONTINUOUSLY CONNECTED TO SAID RAILS AT ONE END OF SAID LENGTH, A SIGNAL RELAY HAVING A WINDING ENERGIZED FROM AND CONTINUOUSLY CONNECTED ACROSS SAID RAILS AT THE OTHER END OF SAID LENGTH, A MAGNETIC WHEEL TRIP RESPONSIVE TO THE PASSAGE OF A WHEEL FLANGE NEAR ONE OF SAID ENDS AND DEVELOPING A VOLTAGE PULSE AT THE
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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 |