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Patent US2994764A successfully refreshed from Google Patents.
US2994764A
Expired / Lapsed
US
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Train detecting apparatus
Assignee: Westinghouse Air Brake Co
•
Filing: 1957-12-04
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Granted: 1961-08-01
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Expires: 1977-12-04
Abstract
No abstract record available.
Inventors
- 👤 Harold G Witmer
- 👤 Lawrence R Golladay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:04
CPC Classifications
B; B61; B61L; B61L1/00; B61L1/16; B61L1/161; B61L1/163; B61L1/165; B61L1/167; B61L13/00; B61L13/04; B61L13/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1830775A
Cited
US2030924A
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US2096404A
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US2183162A
Cited
US2465794A
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US2550860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |