Patent US3520569A successfully refreshed from Google Patents.
US4072606A
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Method for coagulating a colloidal suspension
Assignee: Mobil Oil AS
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Filing: 1976-06-14
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Granted: 1978-02-07
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Expires: 1996-06-14
Abstract
Abstract Water-soluble polymers that thicken reversibly in aqueous solution on alteration of the degree of alkalinity are manufactured by treating an aqueous suspension of protein with the enzymes elaborated extracellularly by a species of the genus Pseudomonas. The water soluble polymers resulting therefrom are biodegradable. They are useful for stabilizing emulsions, as flow-control agents in water base paint, and as anti-redeposition agents in laundry detergents. They are particularly useful as coagulants for colloidal suspensions of solids such as the phosphate slimes byproduct of the large scale hydraulic mining of phosphate deposits. They are also particularly useful as flow control agents in the water flooding process for the recovery of petroleum.
Inventors
- 👤 Richard Irwin Leavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:25
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C02; C02F; C02F1/00; C02F1/52; C02F1/5263; C09D; C09D7/00; C09D7/40; C09D7/43; C12; C12N; C12N1/00; C12N1/20; C12N1/205; C12P; C12P1/00; C12P1/04; C08; C08L; C08L89/00; C12R; C12R2001/00; C12R2001/01; C12R2001/38; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906; Y10S210/907; Y10S507/00; Y10S507/935; Y10S507/936; Y10S530/00; Y10S530/859
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A method for coagulating a colloidal suspension, which comprises adding to the colloidal suspension water-soluble nitrogen-containing polymers formed by contacting, under conversion conditions, a water-dispersible protein with the extracellular enzymes formed by the microorganism Psendomonas fabricans No. 492 (A.T.C.C. No. 21984), said water-soluble polymers being further characterized by reversibly thickening in aqueous solution on adjustment of the degree of alkalinity.
Claim 2
Independent Claim
60 words
A method for coagulating a colloidal suspension, which comprises adding to the colloidal suspension water-soluble nitrogen-containing polymers formed by contacting, under conversion conditions, a water-dispersible protein with the extracellular enzymes formed by the microorganism Psendomonas fabricans No. 492 (A.T.C.C. No. 21984), said water-soluble polymers being further characterized by reversibly thickening in aqueous solution on adjustment of the degree of alkalinity.
Claim 3
Dependent Claim
18 words
The method described in claim 1 wherein said colloidal suspension comprises microfine hydrophilic clay particles suspended in water.
Claim 4
Dependent Claim
14 words
The method described in claim 1 wherein said water-dispersible protein is defatted cottonseed meal.
Claim 5
Dependent Claim
13 words
The method described in claim 1 wherein said water-dispersible protein is egg albumin.
Claim 6
Dependent Claim
13 words
The method described in claim 1 wherein said water-dispersible protein is blood serum.
Claim 7
Dependent Claim
48 words
The method described in claim 1 wherein said colloidal suspension is the slime waste produced by the hydraulic mining of phosphate rock, said polymers are added in an amount of up to 1% by weight and the pH of the suspension is adjusted to for 9.5 to 12.0.
Claim 8
Dependent Claim
21 words
The method described in claim 6 wherein the amount of water-soluble polymer does not exceed 0.2% by weight of slime waste.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |