US3753962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of a water soluble polymer powder from an aqueous gel of said polymer
Assignee: Zeneca Inc
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Filing: 1970-03-16
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Granted: 1973-08-21
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Expires: 1990-03-16
Abstract
Abstract A PROCESS IS DESCRIBED FOR THE RECOVERY OF A HIGH MOLECULAR WEIGHT POLYMER AS A WATER-SOLUBLE POWDER FROM A STIFF, RUBBER LIKE AQUEOUS GEL OF THE POLYMER. THE PROCESSING STEPS INCLUDE: CUTTING THE RUBBERY POLYMER GEL, WHICH IS FORMED DURING THE POLYMERIZATION OFF THE POLYMER CONTACTING THE CUT GEL WIT A WATER MISCIBLE AND POLYMER IMMISCIBLE SOLVENT CAUSING A PRECIPITATE OF THE POLYMER TO FORM, ANDD THEN RECOVERING THE POLYMER PRECIPITATE BY SEPARATION.
Inventors
- 👤 A Restaino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:52
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J2333/00; Y; Y10; Y10S; Y10S526/00; Y10S526/93
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |