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US2884663A
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Process for producing improved polymeric terephthalate film
Assignee: EIDP Inc
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Filing: 1956-12-20
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Granted: 1959-05-05
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Expires: 1976-12-20
Abstract
No abstract record available.
Inventors
- 👤 Alles Francis Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:24
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; B; B29; B29C; B29C55/00; B29C55/005; B29C55/02; B29C55/04; B29C55/06; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; B29C71/00; B29K; B29K2067/00; Y; Y10; Y10S; Y10S264/00; Y10S264/73; Y10S8/00; Y10S8/04; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31815
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
THE PROCESS OF IMPROVING A POLYMERIC LINEAR TEREPHTHALATE ESTER FILM WHICH HAS BEEN SUBSTANTIALLY UNIFORMLY ORIENTED BY STRETCHING IN BOTH DIRECTIONS AT LEAST 2.5X ITS INITIAL DIMENSIONS AND HEAT SET AT A TEMPERATURE BETWEEN ABOUT 150* C, AND ABOUT 20* BELOW THE MELTING POINT OF THE TEREPHTHALATE ESTER, SAID PROCESS COMPRISING STRETCHING SAID FILM IN ONE DIRECTION AT LEAST 1.4X AT A TEMPERATURE OF FROM ABOUT 20* C. TO 205* C., AND HEAT SETTING SAID FILM AT A TEMPERATURE OF FROM ABOUT 150* TO 235* C. UNDER TENSION SUFFICIENT TO PREVEENT SHRINKAGE IN SAID ONE DIRECTION.
Claim 2
Dependent Claim
96 words
THE PROCESS OF IMPROVING A POLYMERIC LINEAR TEREPHTHALATE ESTER FILM WHICH HAS BEEN SUBSTANTIALLY UNIFORMLY ORIENTED BY STRETCHING IN BOTH DIRECTIONS AT LEAST 2.5X ITS INITIAL DIMENSIONS AND HEAT SET AT A TEMPERATURE BETWEEN ABOUT 150* C, AND ABOUT 20* BELOW THE MELTING POINT OF THE TEREPHTHALATE ESTER, SAID PROCESS COMPRISING STRETCHING SAID FILM IN ONE DIRECTION AT LEAST 1.4X AT A TEMPERATURE OF FROM ABOUT 20* C. TO 205* C., AND HEAT SETTING SAID FILM AT A TEMPERATURE OF FROM ABOUT 150* TO 235* C. UNDER TENSION SUFFICIENT TO PREVEENT SHRINKAGE IN SAID ONE DIRECTION.
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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |