Patent US2636712A successfully refreshed from Google Patents.
US2636712A
Expired / Lapsed
US
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Slide valve for regulating the flow of solids
Assignee: Standard Oil Development Co
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Filing: 1950-04-03
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Granted: 1953-04-28
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Expires: 1970-04-03
Abstract
No abstract record available.
Inventors
- 👤 Charles W Lubbock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:47
CPC Classifications
F; F16; F16K; F16K25/00; F16K25/04; B; B01; B01J; B01J8/00; B01J8/0015; B01J8/002; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6161; Y10T137/6164; Y10T137/6178
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US412789A
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US824585A
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US953133A
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US998400A
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US1550725A
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US2194254A
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US1838656A
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US2079743A
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DE664505C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |