Patent US2852138A successfully refreshed from Google Patents.
US2852138A
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Method of and apparatus for clarifying liquids
Assignee: Dorr Oliver Inc
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Filing: 1956-09-04
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Granted: 1958-09-16
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 Cyril H Knight
- 👤 Lorne C Varcoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:49
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0064; B; B01; B01D; B01D21/00; B01D21/0096; B01D21/02; B01D21/04; B01D21/06; B01D21/18; B01D21/186; B01D21/24; B01D21/2405; B01D21/2427; B01D21/2444; B01D21/245; B01D21/0006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |