US3725263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste water treatment
Assignee: Individual
•
Filing: 1970-12-15
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Granted: 1973-04-03
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Expires: 1990-12-15
Abstract
Abstract THE ADDITION OF CLARIFICATION CHEMICALS IN A FILTRATION PROCESS IS PRECISELY CONTROLLED BY THE CONTINUOUS SAMPLING OF CHEMICALLY TREATED UNFILTERED WATER PASSING THROUGH A COARSE TO FINE MEDIA BED OF A PILOT FILTER DEVICE. THE PILOT FILTER DEVICE MEASURES TURBIDITY OF WATER WHICH PASSED AT A POINT INTERMEDIATE THROUGH THE FILTER MEDIA BED AND WHICH LEAVES THE FILTER AS FINAL EFFLUENT. BY ESTABLISTING AND MAINTAINING AN OPTIMUM RELATIONSHIP OF THE INTERMEDIATE AND THE EFFUENT TURBIDITIES, THE PROPER METERING OF CLARIFICATION CHEMICIALS IS READILY ACHIEVED IN THAT BOTH UNDER DOSE AND OVERDOSE OF CHEMICALS IS QUICKLY DETECTED.
Inventors
- 👤 R Harris
- 👤 E Morey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:13
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5209; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/82; G01N21/83; C02F1/001; C02F1/004; C02F1/28; C02F1/283; C02F2001/007; C02F2209/00; C02F2209/005; C02F2209/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |