US2817009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Track circuit for railroad
Assignee: SPX Technologies Inc
•
Filing: 1953-11-09
•
Granted: 1957-12-17
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Expires: 1973-11-09
Abstract
No abstract record available.
Inventors
- 👤 Oscar S Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:24
CPC Classifications
B; B61; B61L; B61L13/00; B61L13/04; B61L13/045; B61L1/00; B61L1/02; B61L1/025; B61L1/18; B61L1/181; B61L1/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US184842A
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US1233231A
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US1491295A
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US1577981A
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US1610800A
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US1662444A
Cited
US1814465A
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US2042606A
Cited
US2105930A
Cited
US2108759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |