Patent US2698377A successfully refreshed from Google Patents.
US2698377A
Expired / Lapsed
US
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Railway signaling system for measuring distance between trains
Assignee: RCA Corp
•
Filing: 1949-02-09
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Granted: 1954-12-28
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Expires: 1969-02-09
Abstract
No abstract record available.
Inventors
- 👤 Nathaniel I Korman
- 👤 James F Price
- 👤 John R Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:32
CPC Classifications
B; B61; B61L; B61L25/00; B61L25/02; B61L25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1710499A
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US1690459A
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US1690505A
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US1985911A
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US2150857A
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US2214924A
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US2363416A
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US2480160A
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US2460597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |