US3681269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swellable polymers of methacrylic and acrylic acid esters
Assignee: Merck Patent GmbH
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Filing: 1970-02-13
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Granted: 1972-08-01
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Expires: 1990-02-13
Abstract
Abstract THE POLYMERIZATION OF DIMETHACRYLATE AND DIACRYLATE ESTERS OF ALKYLENE AND POLYALKYLENE GLYCOLS OF THE FORMULA R-(O-CH(-X)-CH2)N-O-CH(-X)-CH2-O-R WHEREIN N IS AN INTEGER FROM 0 TO 10**5 AND TRIMETHACRYLATE AND TRIACRYLATE ESTERS OF POLYALKYLENE OXIDE TRIOLS OF THE FORMULA R-O-(CH(-X)-CH2-O)N1-CH2-CH(-(O-CH2-CH(-X))N3-O-R)-CH2- (O-CH2-CH(-X))N2-O-R WHEREIN N1, N2 AND N3 ARE INTEGERS THE SUM OF WHICH IS FROM 3 TO 10**4, X IN EACH INSTANCE BEING H OR CH3 AND R BEING THE ACYL GROUP OF METHACRYLIC OR ACRYLIC ACID, OPTIONALLY IN THE PRESENCE OF UP TO 40% BY WEIGHT OF AN ADDITIONAL CROSS-LINKING AGENT, PRODUCES SWELLABLE GELS USEFUL AS GEL CHROMATOGRAPHY AGENTS.
Inventors
- 👤 Walter Heitz
- 👤 Klaus Pfitzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:29
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/291; C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/20; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |