US3579612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension system for producing high impact polystyrene
Assignee: Mobil Oil AS
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Filing: 1968-09-03
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Granted: 1971-05-18
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Expires: 1988-09-03
Abstract
Abstract IN THE PREPARATION OF HIGH IMPACT POLYSTYRENE BY BULK PREPOLYMERIZATION OF A RUBBER IN A STYRENE FOLLOWED BY AQUEOUS SUSPENSION POLYMERIZATION USING WATER-SOLUBLE SUSPENDING AGENTS, EXCESSIVE FOAMING AND EMULSIFICATION OCCURS. THESE DIFFICULTIES ARE REDUCED BY USING IN THE SUSPENSION SYSTEM A COMBINATION OF A WATER-SOLUBLE HYDROPEROXIDE AND A WATER-SOLUBLE METAL FORMALDEHYDE SULFOXYLATE OR ITS EQUIVALENT, TOGETHER WITH THE WATER-SOLUBLE SUSPENSION AGENT.
Inventors
- 👤 Arthur I Lowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:35
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |