US3248463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous production of biaxially oriented crystalline thermoplastic film
Assignee: Phillips Petroleum Co
•
Filing: 1962-02-15
•
Granted: 1966-04-26
•
Expires: 1982-02-15
Abstract
No abstract record available.
Inventors
- 👤 Fred E Wiley
- 👤 Harry C Wain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:30
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/903; B29C48/03; B29C48/09; B29C48/10; B29C48/001; B29C48/0012; B29C48/0018; B29C48/0019; B29C48/07; B29C48/08; B29C48/885; B29C48/904; B29C48/911; B29C48/9115; B29C48/912; B29C48/9135; B29C48/919; B29K; B29K2995/00; B29K2995/0037; B29K2995/005; B29K2995/0053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A IN A PROCESS FOR PRODUCING A BIAXIALLY ORIENTED FILM OF CRYSTALLINE THERMOPLASTIC POLYMER WHEREIN THE POLYMER MELT IS EXTRUDED IN THE SHAPE OF A TUBE WHICH IS THEN COOLED, REHEATED TO A TEMPERATURE WITHIN A FEW DEGREES BELOW THE POLYMER CRYSTALLINE MELTING POINT, STRETCHED BIAXIALLY BY SIMULTANEOUS RADIAL EXPANSION AND LINEAR EXTENSION, AND COOLED TO SET THE ORIENTATION, THE IMPROVEMENT WHICH COMPRISES DIRECTING A CURRENT OF COOLING GAS ONTO THE OUTER SURFACE OF THE TUBE AS IT IS BEING STRETCHED BIAXIALLY SO THAT THERE IS A SURFACE TEMPERATURE GRADIENT OF AT LEAST 6*F. BETWEEN THE TUBE AT ITS INITIAL DIAMETER AND AT ITS FINAL DIAMETER.
Claim 2
Dependent Claim
106 words
A IN A PROCESS FOR PRODUCING A BIAXIALLY ORIENTED FILM OF CRYSTALLINE THERMOPLASTIC POLYMER WHEREIN THE POLYMER MELT IS EXTRUDED IN THE SHAPE OF A TUBE WHICH IS THEN COOLED, REHEATED TO A TEMPERATURE WITHIN A FEW DEGREES BELOW THE POLYMER CRYSTALLINE MELTING POINT, STRETCHED BIAXIALLY BY SIMULTANEOUS RADIAL EXPANSION AND LINEAR EXTENSION, AND COOLED TO SET THE ORIENTATION, THE IMPROVEMENT WHICH COMPRISES DIRECTING A CURRENT OF COOLING GAS ONTO THE OUTER SURFACE OF THE TUBE AS IT IS BEING STRETCHED BIAXIALLY SO THAT THERE IS A SURFACE TEMPERATURE GRADIENT OF AT LEAST 6*F. BETWEEN THE TUBE AT ITS INITIAL DIAMETER AND AT ITS FINAL DIAMETER.
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |