Patent US2472840A successfully refreshed from Google Patents.
US2472840A
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US
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Valve construction
Assignee: CHRYSIER Corp
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Filing: 1945-02-09
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Granted: 1949-06-14
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Expires: 1965-02-09
Abstract
No abstract record available.
Inventors
- 👤 Lewton Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:28
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/348; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7559
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |