Patent US2637341A successfully refreshed from Google Patents.
US2637341A
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Fluid pressure control valve device
Assignee: Westinghouse Air Brake Co
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Filing: 1949-07-27
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Granted: 1953-05-05
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Expires: 1969-07-27
Abstract
No abstract record available.
Inventors
- 👤 Douglas R Borst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/044; F15B11/00; F15B11/08; F15B11/12; F15B11/121; F15B13/0401; F15B13/0402; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/3056; F15B2211/30565; F15B2211/3057; F15B2211/32; F15B2211/327; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/765; F15B2211/7653; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614; Y10T137/86839
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US465232A
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US1251563A
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US1785658A
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US1937077A
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US2134208A
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US2067363A
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US2179815A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |