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Patent US2756959A successfully refreshed from Google Patents.
US2756959A
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Fluid-pressure responsive sphincter valve
Assignee: GLOBE Co
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Filing: 1951-07-25
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Granted: 1956-07-31
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Expires: 1971-07-25
Abstract
No abstract record available.
Inventors
- 👤 John W Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:58
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/02; F16K7/04; F16K7/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US614968A
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US2247363A
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GB540685A
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US2487226A
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US2573712A
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US2587188A
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US2518625A
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US2590215A
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US2575240A
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US2604246A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |