US2575982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure control mechanism
Assignee: Westinghouse Air Brake Co
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Filing: 1949-04-14
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Granted: 1951-11-20
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Expires: 1969-04-14
Abstract
No abstract record available.
Inventors
- 👤 Roy R Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:01
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/3023; F15; F15B; F15B11/00; F15B11/08; F15B11/12; F15B11/121; F15B11/123; F16H3/00; F16H61/00; F16H61/26; F16H61/28; F16H61/30; F16H2061/307; F16H2712/00; F16H2712/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87233
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |