Patent US2491429A successfully refreshed from Google Patents.
US2491429A
Expired / Lapsed
US
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Valve construction
Assignee: Individual
•
Filing: 1947-03-08
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Granted: 1949-12-13
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Expires: 1967-03-08
Abstract
No abstract record available.
Inventors
- 👤 Sr James W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:55
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/10; F16K11/12; F16K11/20; F16K11/202; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87096; Y10T137/87121; Y10T137/87129
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US616827A
Cited
US1078252A
Cited
US1354522A
Cited
US1642623A
Cited
US1807081A
Cited
GB318747A
Cited
US2106310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |