Patent US3631014A successfully refreshed from Google Patents.
US3631014A
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Suspension polymerization process
Assignee: Atlantic Richfield Co
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Filing: 1969-10-14
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Granted: 1971-12-28
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Expires: 1989-10-14
Abstract
Abstract THE PRODUCTION OF POLYMER PARTICLES OR BEADS BY SUSPENDING, AS DROPLETS, A VINYL AROMATIC MONOMR HAVING A FREE RADICAL GENERATING CATALYST DISSOLVED THEREIN, IN AN AQUEOUS MEDIUM WITH THE AID OF A FINELY DIVIDED PHOSPHATE SUSPENDING AGENT AND HEATING THE SUSPENSION TO CAUSE THE MONOMER TO POLYMERIZE INTO POLYMER PARTICLES IS IMPROVED BY ADDING TO THE SUSPENSION AT LEAST ABOUT 0.0003 PERCENT BY WEIGHT BASED ON MONOMER OF SODIUM BISULFITE TO THE SUSPENSION BEFORE THE DROPLETS REACH THE BEAD IDENTITY POINT.
Inventors
- 👤 Harold A Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:04
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |