US2537185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatically operated signal trip mechanism
Assignee: American District Telegraph Co
•
Filing: 1946-08-31
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Granted: 1951-01-09
•
Expires: 1966-08-31
Abstract
No abstract record available.
Inventors
- 👤 Francis C Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:01
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/04; Y; Y10; Y10T; Y10T74/00; Y10T74/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1603072A
Cited
US963039A
Cited
US969414A
Cited
AU1766529A
Cited
US1973535A
Cited
US1938845A
Cited
US2275949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |