US2688978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid flow check valve
Assignee: Detroit Controls Corp
•
Filing: 1950-06-20
•
Granted: 1954-09-14
•
Expires: 1970-06-20
Abstract
No abstract record available.
Inventors
- 👤 Wangenheim Adolf Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:27
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/1402; F16K15/148; F16K2200/00; F16K2200/40; F16K2200/401; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/784; Y10T137/7847; Y10T137/7848
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1867478A
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US1978025A
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US2051023A
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US2105183A
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US2131809A
Cited
US2214346A
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US2291603A
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US2270468A
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FR897256A
Cited
US2429984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |