US2920352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of casting and stretching film
Assignee: EIDP Inc
•
Filing: 1954-04-23
•
Granted: 1960-01-12
•
Expires: 1974-04-23
Abstract
No abstract record available.
Inventors
- 👤 Miller Meredith
- 👤 Mc-Gregor Donald Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:12
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; B29C55/06; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/25; B29C48/88; B29C48/91; B29C48/911; B29C48/9135; B29C48/914; B29C55/065; B29K; B29K2067/00; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE PROCESS WHICH COMPRISES CONTINUOUSLY CASTING SUBSTANTIALLY AMORPHOUS POLYETHYLENE TEREPHTHALATE BETWEEN SUITABLY SPACED AND SHAPED EXTRUDER LIPS TO FORM A CONTINUOUS, SUBSTANTIALLY SYMMETRICAL FLIM WHICH HAS ITS MAXIMUM THICKNESS AT THE CENTER PORTION OF THE FLIM, MEASURED ALONG THE TRANSVERSE AXIS OF THE FLIM, AND WHICH TAPERS DOWN AT EACH EDGE PORTION OF THE FLIM, THE WIDTH OF EACH TAPERED EDGE PORTION CONSTITUTING AT LEAST 15% OF THE TOTAL WIDTH OF THE FLIM, AND THEREAFTER CONTINUOUSLY STRETCHING SAID FLIM LONGITUDINALLY OVER AND ON CLOSELY SPACED STRETCHING ROLLS, WHEREBY TO PRODUCE A STRETCHED FLIM OF SUBSTANTIALLY UNIFORM THICKNESS.
Claim 2
Dependent Claim
97 words
THE PROCESS WHICH COMPRISES CONTINUOUSLY CASTING SUBSTANTIALLY AMORPHOUS POLYETHYLENE TEREPHTHALATE BETWEEN SUITABLY SPACED AND SHAPED EXTRUDER LIPS TO FORM A CONTINUOUS, SUBSTANTIALLY SYMMETRICAL FLIM WHICH HAS ITS MAXIMUM THICKNESS AT THE CENTER PORTION OF THE FLIM, MEASURED ALONG THE TRANSVERSE AXIS OF THE FLIM, AND WHICH TAPERS DOWN AT EACH EDGE PORTION OF THE FLIM, THE WIDTH OF EACH TAPERED EDGE PORTION CONSTITUTING AT LEAST 15% OF THE TOTAL WIDTH OF THE FLIM, AND THEREAFTER CONTINUOUSLY STRETCHING SAID FLIM LONGITUDINALLY OVER AND ON CLOSELY SPACED STRETCHING ROLLS, WHEREBY TO PRODUCE A STRETCHED FLIM OF SUBSTANTIALLY UNIFORM THICKNESS.
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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |