Patent US4449248A successfully refreshed from Google Patents.
Patent US2851733A successfully refreshed from Google Patents.
US2851733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of stretching thermoplastic film
Assignee: EIDP Inc
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Filing: 1956-01-03
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Granted: 1958-09-16
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Expires: 1976-01-03
Abstract
No abstract record available.
Inventors
- 👤 William J Pangonis
- 👤 Verne L Simril
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C71/00; B29K; B29K2067/00; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A PROCESS FOR ORIENTING A THERMOPLASTIC POLYMERIC FILM WHICH COMPRISES HEATING THERMOPLASTIC POLYMERIC FILM HEAVY GAUGE VARIATIONS AND AN INITIAL MAXIMUM THICKNESS OF NOT OVER 20 MILS TO A UNIFORM TEMPERTURE SUBSTANTIALLY ABOUT ITS SECOND ORDER TRANSITION TERMPERATURE AND BELOW THE TEMPERATURE AT WHICH MOLECULAR ORIENTATION IS NOT EFFECTED BY STRETCHING, STRETCHING THE FILM IN THE DIRECTION IN WHIHC SAID GAUGE VARIATIONS ARE MEASURED WHILE COOLING THE FILM AT A RATE SUFFICIENT TO CREATE AND MAINTAIN A TEMPERATURE DIFFERENTIAL OF FROM 0.5-2.5*C., BETWEEN THICK AND THIN AREAS OF THE FILM, AND COMPLETING STRETCHING BEFORE THE TEMPERATURE OF ANY AREA OF THE FILM IS COOLED TO SAID SECOND ORDER TRANSITION TEMPERATURE.
Claim 2
Dependent Claim
110 words
A PROCESS FOR ORIENTING A THERMOPLASTIC POLYMERIC FILM WHICH COMPRISES HEATING THERMOPLASTIC POLYMERIC FILM HEAVY GAUGE VARIATIONS AND AN INITIAL MAXIMUM THICKNESS OF NOT OVER 20 MILS TO A UNIFORM TEMPERTURE SUBSTANTIALLY ABOUT ITS SECOND ORDER TRANSITION TERMPERATURE AND BELOW THE TEMPERATURE AT WHICH MOLECULAR ORIENTATION IS NOT EFFECTED BY STRETCHING, STRETCHING THE FILM IN THE DIRECTION IN WHIHC SAID GAUGE VARIATIONS ARE MEASURED WHILE COOLING THE FILM AT A RATE SUFFICIENT TO CREATE AND MAINTAIN A TEMPERATURE DIFFERENTIAL OF FROM 0.5-2.5*C., BETWEEN THICK AND THIN AREAS OF THE FILM, AND COMPLETING STRETCHING BEFORE THE TEMPERATURE OF ANY AREA OF THE FILM IS COOLED TO SAID SECOND ORDER TRANSITION TEMPERATURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |