Patent US3258453A successfully refreshed from Google Patents.
US3258453A
Expired / Lapsed
US
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Recovery process incorporating step of treating polymer with a surfactant
Assignee: Monsanto Co
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Filing: 1963-11-18
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Granted: 1966-06-28
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Expires: 1983-11-18
Abstract
No abstract record available.
Inventors
- 👤 Henry K Chi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:55
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/24; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PROCESS FOR RECOVERING BEADS OF POLYMER OF A VINYL HALIDE, VINYLIDENE HALIDE, ALKYL ACRYLATE, ALKYL METHACRYLATE, CONJUGATED 1,3-DIENE, MONMOVINYLIDENE AROMATIC HYDROCARBON AND/OR AR-HALOSTYRENE FROM AN AQUEOUS SLURRY CONTAINING A WATER-SOLUBLE INTERPOLYMER OF (A) ACRYLIC ACID/AND/OR METHACRYLIC ACID AND (B) A C6-C18 ALKYL ACRYLATE AND/OR A C6-C18 ASLKYL METHACRYLATE AS A SUSPENDING AGENT BY NEUTRALIZING AND DEWATERING THE SLURRY AND WASHING AND DRYING THE BEADS, THE IMPROVEMENT WHICH COMPRISES ADDING ABOUT 0.001-1% OF A NON-IONIC SURFACTANT, BASED ON THE WEIGHT OF THE POLYMER BEADS, PRIOR TO WASHING THE BEADS.
Claim 2
Dependent Claim
90 words
IN A PROCESS FOR RECOVERING BEADS OF POLYMER OF A VINYL HALIDE, VINYLIDENE HALIDE, ALKYL ACRYLATE, ALKYL METHACRYLATE, CONJUGATED 1,3-DIENE, MONMOVINYLIDENE AROMATIC HYDROCARBON AND/OR AR-HALOSTYRENE FROM AN AQUEOUS SLURRY CONTAINING A WATER-SOLUBLE INTERPOLYMER OF (A) ACRYLIC ACID/AND/OR METHACRYLIC ACID AND (B) A C6-C18 ALKYL ACRYLATE AND/OR A C6-C18 ASLKYL METHACRYLATE AS A SUSPENDING AGENT BY NEUTRALIZING AND DEWATERING THE SLURRY AND WASHING AND DRYING THE BEADS, THE IMPROVEMENT WHICH COMPRISES ADDING ABOUT 0.001-1% OF A NON-IONIC SURFACTANT, BASED ON THE WEIGHT OF THE POLYMER BEADS, PRIOR TO WASHING THE BEADS.
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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |