US4160742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of resolving oil-in-water emulsions
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1978-06-15
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Granted: 1979-07-10
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Expires: 1998-06-15
Abstract
Abstract {PG,1 Use of copolymers of acrylamide and methylacrylamidopropyltrimethylammmonium chloride to deemulsify oil-in-water emulsions especially in waste streams prior to their discharge from petroleum refineries, industrial plants and the like.
Inventors
- 👤 Manjeri S. Raman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:57
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; C; C02; C02F; C02F1/00; C02F1/68; C02F1/682
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
A method of breaking oil-in-water emulsions which comprises the steps of treating the emulsion with at least a deemulsifying amount of a copolymer of acrylamide and methacrylamidopropyl trimethylammonium chloride where said copolymer is at least 50% by weight acrylamide.
Claim 2
Independent Claim
39 words
A method of breaking oil-in-water emulsions which comprises the steps of treating the emulsion with at least a deemulsifying amount of a copolymer of acrylamide and methacrylamidopropyl trimethylammonium chloride where said copolymer is at least 50% by weight acrylamide.
Claim 3
Dependent Claim
25 words
A method as in claim 1 wherein said copolymer is at least 90% by weight acrylamide and at least 2% by weight methacrylamidopropyl trimethylammonium chloride.
Claim 4
Dependent Claim
25 words
A method as in claim 2 wherein said acrylamide is 90% by weight and the methacrylamidopropyl trimethylammonium chloride is 10% by weight of said copolymer.
Claim 5
Dependent Claim
25 words
A method as in claim 2 wherein said acrylamide is 95% by weight and the methacrylamidopropyl trimethylammonium chloride is 5% by weight of said copolymer.
Claim 6
Dependent Claim
24 words
A method according to claim 2 wherein 20 to 40 parts by weight of copolymer is employed per million parts by weight of emulsion.
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) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |