US3790538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of thermoreversible coacervates
Assignee: Bayer AG
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Filing: 1971-02-17
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Granted: 1974-02-05
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Expires: 1991-02-17
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF A THERMOREVERSIBLE COACERVATE, WHEREIN FROM 30 TO 70 MOL PERCENT OF ACRYLIC ACID AND FROM 70 TO 30 MOL PERCENT OF ACRYLAMIDE IS COPOLYMERIZED IN AQUEOUS SOLUTION AT A TEMPERATURE OF FROM 15* TO 80*C. USING REDOX CATALYST COMPRISING A WATER SOLUBLE PERSULPHATE AND A REDUCING AGENT, AND THE POLYMER SOLUTION OBTAINED IS OPTIONALLY COOLED TO A TEMPERATURE BELOW 15* TO 30*C.
Inventors
- 👤 N Schoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:30
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08F10/00; C08F10/14; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |