Patent US2494434A successfully refreshed from Google Patents.
US2494434A
Expired / Lapsed
US
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Condensation drain valve
Assignee: Westinghouse Air Brake Co
•
Filing: 1943-11-16
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Granted: 1950-01-10
•
Expires: 1963-11-16
Abstract
No abstract record available.
Inventors
- 👤 Clyde C Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:47
CPC Classifications
F; F16; F16T; F16T1/00; F16T1/12; F16T1/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3102; Y10T137/3105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US654569A
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US754467A
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US1075701A
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FR471742A
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US1551651A
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US1620624A
Cited
US1690093A
Cited
US1858291A
Cited
US2141688A
Cited
US2128206A
Cited
US2361084A
Cited
GB558796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |