US2820758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sewage in liquid form and similar materials
Assignee: Dorr Oliver Inc
•
Filing: 1952-10-15
•
Granted: 1958-01-21
•
Expires: 1972-10-15
Abstract
No abstract record available.
Inventors
- 👤 Renville S Rankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:39
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN THE TREATMENT OF LIQUIDS HAVING POLLUTING MATERIAL THEREIN WHEREIN SAID LIQUID AND POLLUTING MATERIAL ARE PASSED THROUGH A PRELIMINARY TREATMENT STATION AND ARE THEN CIRCULATED TO A SEDIMENTATION TANK THROUGH AN INLET THEREIN, THE IMPROVED PROCESS COMPRISING THE STEPS OF SELECTIVELY WITHDRAWING SUSPENDED SOLIDS IN THE SEDIMENTATION TANK FROM A PLURALITY OF ZONES SPACED AT DIFFERENT DISTANCES FORM SAID TANK INLET, AND RETURINING AT LEAST A PORTION OF SAID WITHDRAWN SUSPENDED SOLIDS TO SAID PRELIMINARY TREATMENT STATION.
Claim 2
Dependent Claim
78 words
IN THE TREATMENT OF LIQUIDS HAVING POLLUTING MATERIAL THEREIN WHEREIN SAID LIQUID AND POLLUTING MATERIAL ARE PASSED THROUGH A PRELIMINARY TREATMENT STATION AND ARE THEN CIRCULATED TO A SEDIMENTATION TANK THROUGH AN INLET THEREIN, THE IMPROVED PROCESS COMPRISING THE STEPS OF SELECTIVELY WITHDRAWING SUSPENDED SOLIDS IN THE SEDIMENTATION TANK FROM A PLURALITY OF ZONES SPACED AT DIFFERENT DISTANCES FORM SAID TANK INLET, AND RETURINING AT LEAST A PORTION OF SAID WITHDRAWN SUSPENDED SOLIDS TO SAID PRELIMINARY TREATMENT STATION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |