US3617573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble copolymers in flocculation of inorganic particles
Assignee: Hercules LLC
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Filing: 1969-11-03
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Granted: 1971-11-02
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Expires: 1989-11-03
Abstract
Abstract Predominantly inorganic, water-insoluble particles suspended in aqueous salt solutions are flocculated and settled by adding to the solution a water-soluble copolymer of acrylamide and an alkali metal or ammonium salt of a sulfoalkyl acrylate. Preferred copolymer is acrylamide -sodium sulfoproplly acrylate.
Inventors
- 👤 Daniel J Monagle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:22
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A process for flocculating and settling predominantly inorganic particles from suspension in a salt solution which comprises adding to said suspension, per ton of suspended clay, about 0.01 to 1 pound of a water-soluble copolymer consisting essentially of 85 to 98 percent by weight acrylamide and 15 to 2 percent by weight of an alkali metal salt of a sulfoalkyl acrylate, said copolymer having an RSV of at least about 5 measured in a 0.1 percent solution in 0.1M KCl at 25* C.
Claim 2
Dependent Claim
17 words
The process of claim 2 where the alkali metal salt in the copolymer is sodium sulfopropyl acrylate.
References Cited (Backward Citations)
GB842563A
Cited
US3493500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |