Patent US2757752A successfully refreshed from Google Patents.
US2757752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve assembly for drain conduits
Assignee: Individual
•
Filing: 1952-07-30
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Granted: 1956-08-07
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Expires: 1972-07-30
Abstract
No abstract record available.
Inventors
- 👤 Jack W Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:53
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436; Y10T137/7504
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1137516A
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US1808411A
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US1753724A
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US2016499A
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US2328315A
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US2524501A
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US2478976A
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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) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |