US3177277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of biaxially oriented polyethylene terephthalate film
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1957-05-10
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Granted: 1965-04-06
•
Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Adams John Francis Edward
- 👤 Gerber Kenneth George
- 👤 Holmes-Walker William Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/005; B29K; B29K2067/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS COMPRISING THE STEPS OF EXTRUDING MOLTEN HIGHLY POLYMERIC POLYETHYLENE TEREPHTHALATE IN FILM FORM, COOLING THE EXTRUDED FILM TO CONVERT IT TO THE SOLID, SUBSTANTIALLY AMORPHOUS FORM, BIAXIALLY ORIENTING THE SOLIDIFIED FILM BY STRETCHING IT LATERALLY AND LONGITUDINALLY, THE DEGREE OF STRETCH IN EACH DIRECTION BEING WITHIN THE RANGE OF FROM ABOUT 2:1 TO ABOUT 5:1, HEAT SETTING THE BIAXIALLY ORIENTED FILM, AND THEREAFTER FURTHER STRETCHING THE FILM IN ONE SUCH DIRECTION IN WHICH GREATER STRENGTH IS REQUIRED AT A TEMPERATURE OF FROM 100* TO 220*C., THE DEGREE OF SUCH FURTHER STRETCH BEING ABOUT 1.5:1.
Claim 2
Dependent Claim
96 words
A PROCESS COMPRISING THE STEPS OF EXTRUDING MOLTEN HIGHLY POLYMERIC POLYETHYLENE TEREPHTHALATE IN FILM FORM, COOLING THE EXTRUDED FILM TO CONVERT IT TO THE SOLID, SUBSTANTIALLY AMORPHOUS FORM, BIAXIALLY ORIENTING THE SOLIDIFIED FILM BY STRETCHING IT LATERALLY AND LONGITUDINALLY, THE DEGREE OF STRETCH IN EACH DIRECTION BEING WITHIN THE RANGE OF FROM ABOUT 2:1 TO ABOUT 5:1, HEAT SETTING THE BIAXIALLY ORIENTED FILM, AND THEREAFTER FURTHER STRETCHING THE FILM IN ONE SUCH DIRECTION IN WHICH GREATER STRENGTH IS REQUIRED AT A TEMPERATURE OF FROM 100* TO 220*C., THE DEGREE OF SUCH FURTHER STRETCH BEING ABOUT 1.5:1.
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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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |