Patent CH31706A successfully refreshed from Google Patents.
US3585263A
Expired / Lapsed
US
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Melt-extrusion of oxidizable melt with agent releasing non-oxidizing gases
Assignee: Celanese Canada Inc
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Filing: 1969-02-06
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Granted: 1971-06-15
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Expires: 1989-02-06
Abstract
Abstract A MELT-EXTRUSION PROCESS HAVING REDUCED TENDENCY TO OXIDIZE AN OXIDIZABLE MELT-EXTRUDABLE FRAGMENTED POLYMERIC MATERIAL, THE IMPROVEMENT WHICH COMPRISES FEEDING IN A MELT-EXTRUSION APPARATUS AT LEAST ONE OXIDIZABLE MELT-EXTRUDABLE POLYMERIC MATERAL IN FRAGMENTS AND AN AGENT RELEASING BETWEEN ABOUT ROOM TEMPERATURE AND 50* C. BELOW THE SOFTENING POINT OF SAID POLYMERIC MATERIAL, NON-OXIDIZING GASES, SAID POLYMERIC MATERIAL FRAGMENTS BEING IMPERMEABLE TO SAID AGENT AND SAID NON-OXIDIZING GASES. THIS PROCESS IS PARTICULARLY SUITABLE FOR THE MELTEXTRUSION OF STEREOREGULAR POLYOLEFIN, ESPECIALLY POLYPROPYLENE , INTO PRODUCTS HAVING FUNICULAR STRUCTURE.
Inventors
- 👤 Nestor Slyvain Rassart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:37
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |