Patent US2771997A successfully refreshed from Google Patents.
US2771997A
Expired / Lapsed
US
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Apparatus for separating water, oil, sludges, waxes, and the like
Assignee: Individual
•
Filing: 1952-06-23
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Granted: 1956-11-27
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Expires: 1972-06-23
Abstract
No abstract record available.
Inventors
- 👤 Unthank George Rodham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:19
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D17/0211; B01D17/0214
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1116903A
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US1450545A
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US1490794A
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US1636815A
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US1663651A
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US1672583A
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US2031437A
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US2229610A
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US2342950A
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US2361577A
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US2661094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |