US3830901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for extruding cellular thermoplastics
Assignee: Solo Cup Operating Corp
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Filing: 1970-06-05
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Granted: 1974-08-20
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Expires: 1990-06-05
Abstract
Abstract A CONTINUOUS PROCESS FOR EXTRUDING CELLULAR THERMOPLASTICS, WHEREIN A BLOWING AGENT IS INTRODUCED INTO A CHARGE OF THERMOPLASTICS MATERIAL WHILE THE LATTER IS BEING HEATED, FLUXED AND MIXED UNDER CONTROLLED TEMPERATURE AND PRESSURE CONDITIONS IN THE EXTRUSION BARREL OF A SINGLE SCREW EXTRUSION MCHINE. AFTER LAVING THE BARREL, THE MATERIAL IS SEPARATELY METERED AT A POINT PHYSICALLY AND THERMALLY REMOVED FROM THE EXTRUSION MACHINE TO REGULATE PRESSURES AND OUTPUT, AND THE METERED MATERIAL IS THEN SEPARATELY COOLED AND EXTRUDED THROUGH A DIE ORIFICE.
Inventors
- 👤 T Winstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:14
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |