US3171804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage and industrial waste purification process
Assignee: Individual
•
Filing: 1961-10-16
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Granted: 1965-03-02
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Archie H Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:34
CPC Classifications
C; C02; C02F; C02F9/00; C02F1/00; C02F1/52; C02F1/5236; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE METHOD OF TREATING SEWAGE AND LIQUID INDUSTRIAL WASTES CONTAINING IN EXCESS OF 50 P.P.M. BOD AND IN EXCESS OF 100 P.P.M. TOTAL SOLIDS WHICH COMPRISES PASSING SAID WASTES THROUGH A PRIMARY SETTLING TANK, WITHDRAWING THE SLUDGE FROM SAID TANK AND PASSING THE SAME TO DISPOSAL, WITHDRAWING THE EFFLUENT FROM SAID TANK AND ADDING ON INORGANIC FLOCCULANT THERETO AND THEREAFTER PASSING SAID WASTES THROUGH A FILTER BED GRADING FROM COARSE TO FINE
Claim 2
Independent Claim
72 words
THE METHOD OF TREATING SEWAGE AND LIQUID INDUSTRIAL WASTES CONTAINING IN EXCESS OF 50 P.P.M. BOD AND IN EXCESS OF 100 P.P.M. TOTAL SOLIDS WHICH COMPRISES PASSING SAID WASTES THROUGH A PRIMARY SETTLING TANK, WITHDRAWING THE SLUDGE FROM SAID TANK AND PASSING THE SAME TO DISPOSAL, WITHDRAWING THE EFFLUENT FROM SAID TANK AND ADDING ON INORGANIC FLOCCULANT THERETO AND THEREAFTER PASSING SAID WASTES THROUGH A FILTER BED GRADING FROM COARSE TO FINE
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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |