US3393149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dosage control system and method for the treatment of water or sewage
Assignee: General Services Co
•
Filing: 1965-12-14
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Granted: 1968-07-16
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Expires: 1985-12-14
Abstract
No abstract record available.
Inventors
- 👤 Walter R Conley
- 👤 Richard H Evers
- 👤 William F Ettlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:19
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN THE TREATMENT OF WATER OR SEWAGE TO BE FILTERED, THE METHOD OF CONTROLLING THE DOSAGE OF COAGULATING CHEMICALS ADDED TO THE INFLUENT TO BE TREATED COMPRISING: ADDING AN INORGANIC COAGULANT TO THE RAW INFLUENT, WITHDRAWING A PORTION OF SAID COAGULANT-TREATED INFLUENT AND ADJUSTING THE ALKALINITY OF THE SAME SO THAT SAID PORTION HAS A PREDETERMINED MINIMUM ALKALINITY FOR PROMOTING OPTIMUM COAGULATION, THEN FILTERING THE SAID PORTION TO REMOVE COAGULATED MATERIAL THEREFROM,
Claim 2
Dependent Claim
72 words
IN THE TREATMENT OF WATER OR SEWAGE TO BE FILTERED, THE METHOD OF CONTROLLING THE DOSAGE OF COAGULATING CHEMICALS ADDED TO THE INFLUENT TO BE TREATED COMPRISING: ADDING AN INORGANIC COAGULANT TO THE RAW INFLUENT, WITHDRAWING A PORTION OF SAID COAGULANT-TREATED INFLUENT AND ADJUSTING THE ALKALINITY OF THE SAME SO THAT SAID PORTION HAS A PREDETERMINED MINIMUM ALKALINITY FOR PROMOTING OPTIMUM COAGULATION, THEN FILTERING THE SAID PORTION TO REMOVE COAGULATED MATERIAL THEREFROM,
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) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |