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US3486628A
Expired / Lapsed
US
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Sedimentation tank with center-pier supported rotating rake structure
Assignee: Dorr Oliver Inc
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Filing: 1968-05-27
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Granted: 1969-12-30
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Expires: 1988-05-27
Abstract
No abstract record available.
Inventors
- 👤 George M Darby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:37
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0039; B01D21/0042; B01D21/0087; B01D21/10; B01D21/12; B01D21/14; B01D21/24; B01D21/2405; B01D21/2427; B01D21/2433; B01D21/2438
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2236434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |