US4769155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbidity reduction
Assignee: ChampionX LLC
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Filing: 1987-08-19
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Granted: 1988-09-06
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Expires: 2007-08-19
Abstract
Abstract A process for reducing turbidity in turbid waters which comprises adding to said waters a composition consisting essentially of an aqueous solution of: (a) calcium chloride and (b) a water soluble organic positively charged polymeric coagulant having an average molecular weight of at least 2000 selected from the group consisting of polydiallyl dimethylammonium chloride polymer and dimethylamine epichlorohydrin ethylenediamine the weight of (a) to (b) being within the range of 0.75:1 to 4:1.
Inventors
- 👤 Michael L. Dwyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:48
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/5236
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A process for reducing turbidity in turbid waters which comprises adding to said waters in an amount sufficient to reduce the turbidity of said waters a composition consisting essentially of an aqueous solution blend of (a) about 18-40% by weight aqueous solution of calcium chloride and, (b) a water soluble organic positively charged polymeric coagulant having an average molecular weight of at least about 50,000 and an average intrinsic viscosity of at least about 0.12 of a polydiallyl dimethylammonium chloride polymer dissolved in water, the weight ratio of (a) to (b) being within the range of 0.75:1 to 4:1, and clarifying said turbid waters by reducing said turbidity.
Claim 2
Dependent Claim
108 words
A process for reducing turbidity in turbid waters which comprises adding to said waters in an amount sufficient to reduce the turbidity of said waters a composition consisting essentially of an aqueous solution blend of (a) about 18-40% by weight aqueous solution of calcium chloride and, (b) a water soluble organic positively charged polymeric coagulant having an average molecular weight of at least about 50,000 and an average intrinsic viscosity of at least about 0.12 of a polydiallyl dimethylammonium chloride polymer dissolved in water, the weight ratio of (a) to (b) being within the range of 0.75:1 to 4:1, and clarifying said turbid waters by reducing said turbidity.
Claim 3
Dependent Claim
39 words
A process as claimed in claim 1 in which the turbidity of said waters does not exceed 200 ppm and the quantity of said composition added to said waters is sufficient to reduce turbidity at least to 10 NTU.
Claim 4
Dependent Claim
49 words
A process as claimed in claim 1 in which said turbid waters have a low turbidity of not more than 20 ppm of suspended solids and the quantity of said composition added to said waters is sufficient to reduce the turbidity until the NTU is not more than 5.
References Cited (Backward Citations)
US3412019A
Cited
US3994806A
Cited
US3953330A
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US4108768A
Cited
JPS5628612A
Cited
JPS5676293A
Cited
US4308149A
Cited
US4450992A
Cited
JPS5992100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |