Patent US2639727A successfully refreshed from Google Patents.
US2639727A
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US
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Valve structure
Assignee: General Controls Co
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Filing: 1950-03-06
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Granted: 1953-05-26
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Expires: 1970-03-06
Abstract
No abstract record available.
Inventors
- 👤 Ray William Alton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:34
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/10; F23N5/105; Y; Y10; Y10T; Y10T137/00; Y10T137/1407; Y10T137/1516; Y10T137/7722; Y10T137/7723; Y10T137/7724; Y10T137/8593; Y10T137/87265; Y10T137/87499; Y10T137/87507; Y10T137/87515
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2268959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |