Patent US2494435A successfully refreshed from Google Patents.
US2494435A
Expired / Lapsed
US
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Crossover protection system for railroads
Assignee: SPX Technologies Inc
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Filing: 1945-04-12
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Granted: 1950-01-10
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Expires: 1965-04-12
Abstract
No abstract record available.
Inventors
- 👤 Sydney W Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:55
CPC Classifications
B; B61; B61L; B61L13/00; B61L13/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |