US2450481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex control valve device
Assignee: Westinghouse Air Brake Co
•
Filing: 1943-07-31
•
Granted: 1948-10-05
•
Expires: 1963-07-31
Abstract
No abstract record available.
Inventors
- 👤 Harry C May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:43
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/06; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87056; Y10T137/8708
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2082410A
Cited
GB371603A
Cited
US2087223A
Cited
US2202216A
Cited
GB510916A
Cited
US2204048A
Cited
US2337166A
Cited
US2322518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-05 | 1952-04-05 | 1952-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-05 | 1956-04-05 | 1956-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-05 | 1960-04-05 | 1960-10-05 | $7700.00 | Window Closed / Lapsed |