US2791228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-way check valve
Assignee: Crane Co
•
Filing: 1953-07-03
•
Granted: 1957-05-07
•
Expires: 1973-07-03
Abstract
No abstract record available.
Inventors
- 👤 Edward W Carr
- 👤 George E Hansen
- 👤 Adelman John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:17
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/044; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7845
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2040580A
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US1972737A
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FR759867A
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US2133804A
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US2282188A
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US2358228A
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US2459583A
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US2620125A
Cited
GB652478A
Cited
US2623540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |