Patent US4120815A successfully refreshed from Google Patents.
US4120815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric demulsifiers
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1977-10-25
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Granted: 1978-10-17
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Expires: 1997-10-25
Abstract
Abstract Use of a blend of diallyl dimethyl ammonium chloride emulsion polymers to break oil-in-water emulsions in the waste streams at petroleum refineries, industrial plants and the like.
Inventors
- 👤 Manjeri S. Raman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:59
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A method of breaking oil-in-water emulsions which comprise the steps of treating the emulsion with at least a demulsifying amount of a blend of about 50 weight percent of a cationic water-in-oil emulsion polymer which is prepared by the polymerization of a monomer mixture of 50 percent by weight acrylamide, 47.5 percent by weight diallyl dimethyl ammonium chloride, 2.5 percent by weight diallyl diethyl ammonium chloride and about 50 percent by weight of a water-in-oil amphoteric emulsion polymer which is prepared from a monomer mixture of 47.8 by weight acrylamide, 2.2 percent by weight acrylic acid, 47.5 percent by weight diallyl dimethyl ammonium chloride and 2.5 percent by weight diallyl diethyl ammonium chloride.
Claim 2
Independent Claim
113 words
A method of breaking oil-in-water emulsions which comprise the steps of treating the emulsion with at least a demulsifying amount of a blend of about 50 weight percent of a cationic water-in-oil emulsion polymer which is prepared by the polymerization of a monomer mixture of 50 percent by weight acrylamide, 47.5 percent by weight diallyl dimethyl ammonium chloride, 2.5 percent by weight diallyl diethyl ammonium chloride and about 50 percent by weight of a water-in-oil amphoteric emulsion polymer which is prepared from a monomer mixture of 47.8 by weight acrylamide, 2.2 percent by weight acrylic acid, 47.5 percent by weight diallyl dimethyl ammonium chloride and 2.5 percent by weight diallyl diethyl ammonium chloride.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |