US2556752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflux ratio control
Assignee: TIDE WATER ASSOCIATED OIL Co
•
Filing: 1948-09-03
•
Granted: 1951-06-12
•
Expires: 1968-09-03
Abstract
No abstract record available.
Inventors
- 👤 Lionel S Galstaun
- 👤 Edward R Keever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:22
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2022809A
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US1967258A
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US1968385A
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US2093644A
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US2203689A
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US2300742A
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US2374549A
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US2342206A
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US2304865A
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US2453486A
Cited
US2467008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |