US2492023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for operating trolley frogs
Assignee: Westinghouse Electric Corp
•
Filing: 1945-01-19
•
Granted: 1949-12-20
•
Expires: 1965-01-19
Abstract
No abstract record available.
Inventors
- 👤 Charles C Whittaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:49
CPC Classifications
B; B60; B60M; B60M1/00; B60M1/12; B60M1/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE280832C
Cited
US1624011A
Cited
US1390067A
Cited
US1797864A
Cited
US2292820A
Cited
US2157859A
Cited
US2231105A
Cited
US2303506A
Cited
US2337827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |