US3269969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersing agents formed by the heat treatment of interpolymers containing acrylamide and methacrylamide
Assignee: BASF SE
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Filing: 1962-12-21
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Granted: 1966-08-30
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 Fikentscher Hans
- 👤 Wilhelm Hans
- 👤 Wirth Heinrich
- 👤 Dachs Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:34
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; C; C08; C08F; C08F8/00; C09; C09K; C09K23/00; C09K23/017; C09K23/16; C08F2800/00; C08F2800/20; Y; Y10; Y10S; Y10S526/00; Y10S526/91; Y10S526/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR PREPARING IMPROVED DISPERSING AGENTS WHICH COMPRISES HEATING A WATER-CONTAINING SOLUTION OF A COPOLYMER FROM A MIXTURE OF AT LEAST TWO MONOMERS SELECTED FROM THE GROUP CONSISTING OF ARCYLAMIDE, METHACRYLAMIDE, VINYL PYRROLIDONE, VINYL CAPROLACTAM, VINYL CHLORIDE, VINYL METHYL ETHER, VINYL PROPYL ETHER, VINYL ACETATE, VINYL PROPIONATE, AND VINYL IMIDAZOLE, AT LEAST 15% BY WEIGHT OF SAID MIXTURE BEING MONOMERS SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, AND MIXTURES THEREOF, SAID COPOLYMER HAVING A K-VALUE OF FROM ABOUT 20 TO ABOUT 100 UNITS, TO A TEMPERATURE OF AT LEAST ABOUT 50*C. FOR A SUFFICIENT PERIOD OF TIME TO INCREASE THE K-VALUE OF THE COPOLYMER BY FROM ABOUT 40 TO ABOUT 150 UNITS ABOVE THE ORIGINAL K-VALUE OF THE COPOLYMER.
Claim 2
Dependent Claim
121 words
A PROCESS FOR PREPARING IMPROVED DISPERSING AGENTS WHICH COMPRISES HEATING A WATER-CONTAINING SOLUTION OF A COPOLYMER FROM A MIXTURE OF AT LEAST TWO MONOMERS SELECTED FROM THE GROUP CONSISTING OF ARCYLAMIDE, METHACRYLAMIDE, VINYL PYRROLIDONE, VINYL CAPROLACTAM, VINYL CHLORIDE, VINYL METHYL ETHER, VINYL PROPYL ETHER, VINYL ACETATE, VINYL PROPIONATE, AND VINYL IMIDAZOLE, AT LEAST 15% BY WEIGHT OF SAID MIXTURE BEING MONOMERS SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, AND MIXTURES THEREOF, SAID COPOLYMER HAVING A K-VALUE OF FROM ABOUT 20 TO ABOUT 100 UNITS, TO A TEMPERATURE OF AT LEAST ABOUT 50*C. FOR A SUFFICIENT PERIOD OF TIME TO INCREASE THE K-VALUE OF THE COPOLYMER BY FROM ABOUT 40 TO ABOUT 150 UNITS ABOVE THE ORIGINAL K-VALUE OF THE COPOLYMER.
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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |