US2925243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination adjustable needle and check valve
Assignee: Individual
•
Filing: 1953-09-18
•
Granted: 1960-02-16
•
Expires: 1973-09-18
Abstract
No abstract record available.
Inventors
- 👤 David E Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:57
CPC Classifications
F; F16; F16K; F16K47/00; F16K47/08; F16K47/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US395387A
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US740225A
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US2089419A
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GB484369A
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US2271047A
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US2312834A
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US2417217A
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US2531479A
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US2511529A
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US2568123A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |