Patent US6621315B2 successfully refreshed from Google Patents.
US3793239A
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Foamed thermoplastics
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-04-30
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Granted: 1974-02-19
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Expires: 1991-04-30
Abstract
Abstract PRODUCING FOAMED FILMS FROM A BLEND OF A POLYOLEFINE AND A SMALL AMOUNT OF A HIGHER MELTING POLYMER, EXPECIALLY HD POLYETHYLENE/POLYPROPYLENE BLENDS, BY THE PEF PROCESS INVOLVING A 2-COMPONENT BLOWING AGENT SYSTEM.
Inventors
- 👤 J Rixon
- 👤 A Last
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13; Y10S521/00; Y10S521/91
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |