US2794117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined manual block and train identity system
Assignee: SPX Technologies Inc
•
Filing: 1952-08-28
•
Granted: 1957-05-28
•
Expires: 1972-08-28
Abstract
No abstract record available.
Inventors
- 👤 Frank X Rees
- 👤 Clark A Pickell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:56
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1852395A
Cited
US2122229A
Cited
US2122358A
Cited
US2252525A
Cited
US2554000A
Cited
US2670434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |