US3246061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing biaxially oriented polypropylene film
Assignee: EIDP Inc
•
Filing: 1962-08-17
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Granted: 1966-04-12
•
Expires: 1982-08-17
Abstract
No abstract record available.
Inventors
- 👤 Philip S Blatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:20
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/902; B29C48/03; B29C48/09; B29C48/10; B29C2793/00; B29C2793/0063; B29C48/001; B29C48/0018; B29C48/0019; B29C48/0022; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR PREPARING BIAXIALLY ORIENTED POLYPROPYLENE FILM WHICH COMPRISES EXTRUDING A POLYPROPYLENE RESIN IN THE FORM OF A MOLTEN TUBULAR FILM AT A TEMPERATURE OF 200-275*C.; ADVANCING SAID MOLTEN TUBULAR FILM OVER BUT OUT OF CONTACT WITH A COOLING SURFACE, THE COOLING SURFACE CONSISTING OF AT LEAST TWO SECTIONS, A FIRST SECTION BEING A FRUSTO-CONICAL SECTION, THE NARROW END OF WHICH FACES THE POINT OF EXTRUSION, SERVING TO COOL THE FILM TO A TEMPERATURE WITHIN ITS ORIENTATION TEMPERATURE RANGE, A SECOND SECTION CONTINUOUS WITH THE FIRST SECTION AND FROM 0.5 TO 2 TIMES THE LENGTH OF SAID FIRST SECTION BEING A CYLINDRICAL SECTION SERVING TO COOL THE FILM TO A TEMPERATURE AT WHICH SAID FILM IS SET, THE ANNULAR SURFACE OF
Claim 2
Dependent Claim
122 words
A PROCESS FOR PREPARING BIAXIALLY ORIENTED POLYPROPYLENE FILM WHICH COMPRISES EXTRUDING A POLYPROPYLENE RESIN IN THE FORM OF A MOLTEN TUBULAR FILM AT A TEMPERATURE OF 200-275*C.; ADVANCING SAID MOLTEN TUBULAR FILM OVER BUT OUT OF CONTACT WITH A COOLING SURFACE, THE COOLING SURFACE CONSISTING OF AT LEAST TWO SECTIONS, A FIRST SECTION BEING A FRUSTO-CONICAL SECTION, THE NARROW END OF WHICH FACES THE POINT OF EXTRUSION, SERVING TO COOL THE FILM TO A TEMPERATURE WITHIN ITS ORIENTATION TEMPERATURE RANGE, A SECOND SECTION CONTINUOUS WITH THE FIRST SECTION AND FROM 0.5 TO 2 TIMES THE LENGTH OF SAID FIRST SECTION BEING A CYLINDRICAL SECTION SERVING TO COOL THE FILM TO A TEMPERATURE AT WHICH SAID FILM IS SET, THE ANNULAR SURFACE OF
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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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |