Patent US2491355A successfully refreshed from Google Patents.
US2491355A
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Hydraulic valve control mechanism
Assignee: Denison Engineering Co
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Filing: 1945-04-19
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Granted: 1949-12-13
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Expires: 1965-04-19
Abstract
No abstract record available.
Inventors
- 👤 Cecil E Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:09
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/16; F; F15; F15B; F15B11/00; F15B11/08; F15B11/12; F15B13/00; F15B13/02; F15B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751319A
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US679533A
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US1690069A
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US1931452A
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US2169470A
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US2200998A
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US2335809A
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US2212871A
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US2376671A
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US2316471A
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US2389661A
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 |