US3590101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering suspension polymers
Assignee: Monsanto Co
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Filing: 1967-01-18
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Granted: 1971-06-29
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Expires: 1987-01-18
Abstract
Abstract THERE IS DISCLOSED A PROCESS FOR RECOVERING BEADS OF POLYMER PRODUCED BY SUSPENSION POLYMERIZATION FROM AN AQUEOUS SLURRY OF THE BEADS WHEREIN THERE IS ADDED TO THE SLURRY 0.01 TO 1.2 PERCENT BY WEIGHT, BASED UPON THE WEIGHT OF THE POLYMER, OF A POLYETHYLENE GLYCOL HAVING A MOLECULAR WEIGHT OF ABOUT 200 TO 6000. THE AQUEOUS MEDIUM IS THEN REMOVED, GENERALLY BY CENTRIFUGING, AND THE BEADS ARE WASHED WITH WATER AND DRIED. AS A RESULT OF THIS PROCESS, THE BEADS ARE SUBSTANTIALLY FREE FROM STATIC CHARGE SO AS TO FACILITATE HANDLING AND RETAIN UPON THEIR SURFACE A MINOR AMOUNT OF THE POLYALKYLENE GLYCOL WHICH IMPARTS SIGNIFICANT BENEFITS IN SUBSEQUENT HANDLING AND PROCESSING.
Inventors
- 👤 Robert B Mctaggart
- 👤 Tevis Shusman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:11
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/19; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 0
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |