US3657162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making expandable polymeric styrene particles
Assignee: Huntsman Chemical Corp
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Filing: 1968-12-06
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Granted: 1972-04-18
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Expires: 1988-12-06
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF EXPANDABLE PLASTIC BEADS SUITABLE FOR USE IN THE PRODUCTION OF CELLULAR MOLDED PRODUCTS BUY AQUEOUS SUSPENSION POLYMERIZATION IN WHICH A VOLATILE LIQUID BLOWING AGENT IS INCORPORATED INTO THE PLASTIC BEADS WITHIN A SHORT PERIOD AFTER A POLYMER BEAD STAGE OF 50% AND BEFORE A POLYMER BEAD STAGE OF 80% HAS BEEN REACHED AND A NON-HYDROCARBON INERT NON-CONDENSABLE GAS IS ADDED TO THE REACTION CHAMBER PRIOR TO ABSORPTION OF THE BULK OF THE BLOWING AGENT BY THE POLYMER BEADS.
Inventors
- 👤 Arnold B Finestone
- 👤 Michal Niechwiadowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:01
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/20
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |