US3618766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water treatment
Assignee: TAULMAN CO
•
Filing: 1970-01-23
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Granted: 1971-11-09
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Expires: 1990-01-23
Abstract
Abstract A method for precisely controlling the addition of filter aid chemicals to water treated in a high-rate filter apparatus, wherein turbidity measurements are simultaneously made of the water at an intermediate point in the filter bed and of the final filter effluent. The relationship of the turbidity measurements is used to constantly regulate the optimum addition of filter aid chemicals.
Inventors
- 👤 Edward F Morey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/686; C02F2209/00; C02F2209/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
The method of claim 1 wherein said media bed comprises an upper coarse media bed supported by a lower media bed supported by a lower fine media bed and said observation (a) is taken substantially at the interface of said coarse media bed and fine media bed.
Claim 2
Dependent Claim
22 words
The method of claim 2 wherein said coarse media comprises coal having a particle size of from about 0.8 to 1.4 mm.
Claim 3
Dependent Claim
23 words
The method of claim 2 wherein said fine media is sand having an average particle size of from about 0.3 to 0.5 mm.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said process is conducted substantially continuously.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein said process is continued until said relationship is no longer maintainable and said system is back flushed.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein said aid is added substantially continuously in amounts ranging from about 0.001 to about 0.100 p.p.m. of water treated.
Claim 7
Dependent Claim
10 words
The method of claim 6 wherein said aid is Separan.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |