Patent US2631759A successfully refreshed from Google Patents.
US2631759A
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Slide valve for controlling the flow of suspended solids
Assignee: Sinclair Refining Co
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Filing: 1947-11-08
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Granted: 1953-03-17
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Expires: 1967-11-08
Abstract
No abstract record available.
Inventors
- 👤 John E Hoopes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:26
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/082; F; F16; F16K; F16K25/00; F16K25/04; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/2931; Y10T137/4238; Y10T137/4245; Y10T137/4259
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US703583A
Cited
US1873119A
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US1778429A
Cited
US2315058A
Cited
US2305724A
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US2378607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |