Patent US3755520A successfully refreshed from Google Patents.
US3755520A
Expired / Lapsed
US
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Method for the preparation of transparent heat shrinkable thermoplastic polymeric film from foamed thermoplastic polymeric material
Assignee: WR Grace and Co Conn
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Filing: 1971-10-27
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Granted: 1973-08-28
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Expires: 1991-10-27
Abstract
Abstract THE INVENTION DISCLOSED IS DIRECTED TO A PROCESS FOR MAKING BIAXIALLY ORIENTED HEAT-SHRINKABLE FILM, WHICH INCLUDES PROVIDING AN EXPANDED CELLULAR PLASTIC ARTICLE FORMED OF A COMPOSITION COMPRISING A SOFTENABLE THERMOPLASTIC FOAM POLYMER, AND COMPRESSING THE ARTICLE TO COLLAPSE THE FOAM TO AN EXTENT SUCH THAT THE RESULTING RELATIVELY DENSE FILM SHRINKS LONGITUDINALLY AND TRANSVERSELY WHEN HEATED TO ABOVE THE POLYMER MELTING POINT. D R A W I N G
Inventors
- 👤 J Cogliano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:34
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5627; B29C44/5636; B29C61/00; B29C61/003; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/71
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |