US2903572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Route check scheme for railway code communication signaling system
Assignee: SPX Technologies Inc
•
Filing: 1954-12-28
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Granted: 1959-09-08
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Expires: 1974-12-28
Abstract
No abstract record available.
Inventors
- 👤 Robert F Wells
- 👤 Clark A Pickell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:10
CPC Classifications
B; B61; B61L; B61L21/00; B61L21/06; B61L7/00; B61L7/06; B61L7/08; B61L7/088
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2139562A
Cited
US2090912A
Cited
US2592704A
Cited
US2651711A
Cited
US2611074A
Cited
US2608646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |