US2646071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic check valve
Assignee: Individual
•
Filing: 1948-12-29
•
Granted: 1953-07-21
•
Expires: 1968-12-29
Abstract
No abstract record available.
Inventors
- 👤 Wagner William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:11
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/021; F16K15/023; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1476383A
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US912576A
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AT74521B
Cited
US1890513A
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US2238893A
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US2199526A
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US2242555A
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US2502525A
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US2597952A
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US2569316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |