US2928447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: HOSKING PATENT Corp
•
Filing: 1954-10-29
•
Granted: 1960-03-15
•
Expires: 1974-10-29
Abstract
No abstract record available.
Inventors
- 👤 Oakley W Hosking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
B; B60; B60C; B60C29/00; B60C29/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1452284A
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US1426721A
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US2054965A
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US2587470A
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US2475451A
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US2634785A
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US2652858A
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US2576736A
Cited
US2685907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |