US2256279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retaining valve device
Assignee: Westinghouse Air Brake Co
•
Filing: 1939-12-19
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Granted: 1941-09-16
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Expires: 1959-12-19
Abstract
No abstract record available.
Inventors
- 👤 Clyde C Farmer
- 👤 Ellis E Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:19
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/36; B60T15/54; Y; Y10; Y10T; Y10T137/00; Y10T137/794; Y10T137/7976; Y10T137/8593; Y10T137/877; Y10T137/87909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-09-15 | 1945-03-17 | 1945-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-15 | 1949-03-17 | 1949-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-15 | 1953-03-17 | 1953-09-16 | $7700.00 | Window Closed / Lapsed |