US2643090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorbing check valve for hydraulic systems
Assignee: HARJEROY ENGINEERED PETROLEUM
•
Filing: 1950-09-09
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Granted: 1953-06-23
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Expires: 1970-09-09
Abstract
No abstract record available.
Inventors
- 👤 Harlan E Cluphf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:32
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; E; E21; E21B; E21B34/00; E21B34/06; F04B53/12; F04B53/125; F04B53/127; F16; F16K; F16K17/00; F16K17/02; F16K17/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/598; Y10T137/6161; Y10T137/6164; Y10T137/6167; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7846; Y10T137/785; Y10T137/7852; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913; Y10T137/7914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191421225A
Cited
US1885338A
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US1839029A
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US2117056A
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US2152084A
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US2344687A
Cited
US2329960A
Cited
US2354255A
Cited
US2417242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |