US2838657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Train speed control system
Assignee: SPX Technologies Inc
•
Filing: 1955-06-17
•
Granted: 1958-06-10
•
Expires: 1975-06-17
Abstract
No abstract record available.
Inventors
- 👤 Clinton S Wilcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:29
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/20; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2585078A
Cited
US2730576A
Cited
US2721258A
Cited
US2719911A
Cited
US2719912A
Cited
US2653282A
Cited
US2698416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |