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Patent US2426065A successfully refreshed from Google Patents.
US2426065A
Expired / Lapsed
US
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Control valve device
Assignee: Westinghouse Air Brake Co
•
Filing: 1944-06-22
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Granted: 1947-08-19
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Expires: 1964-06-22
Abstract
No abstract record available.
Inventors
- 👤 Roy R Stevens
- 👤 Harry M Linhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:13
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86968
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US616197A
Cited
US1215071A
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US1581546A
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US1926076A
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US2038167A
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US2184413A
Cited
US2097201A
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US2236646A
Cited
US2345306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |