US4243712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrinkable polyethylene terephthalate film
Assignee: Hoechst AG
•
Filing: 1978-12-28
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Granted: 1981-01-06
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Expires: 1998-12-28
Abstract
Abstract This invention relates to a stretched shrinkable film of polyethylene terephthalate containing about 2 to 35 percent by weight of polybutylene terephthalate.
Inventors
- 👤 Klaus Hoheisel
- 👤 Seigfried Janocha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:20
CPC Classifications
B; B65; B65D; B65D65/00; B65D65/38; B29; B29C; B29C61/00; B29C61/003; C; C08; C08J; C08J5/00; C08J5/18; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1331; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
39 words
A stretched shrinkable film comprising a mixture of polyethylene terephthalate and about 2 to 35 percent by weight of polybutylene terephthalate, said film having a shrinkage which begins below 70° C. and is above 8 percent at 75° C.
Claim 2
Dependent Claim
39 words
A stretched shrinkable film comprising a mixture of polyethylene terephthalate and about 2 to 35 percent by weight of polybutylene terephthalate, said film having a shrinkage which begins below 70° C. and is above 8 percent at 75° C.
Claim 3
Dependent Claim
17 words
A film according to claim 1 which contains 5 to 15 percent by weight of polybutylene terephthalate.
Claim 4
Dependent Claim
13 words
A film according to claim 1 which is a biaxially stretched flat film.
Claim 5
Dependent Claim
13 words
A film according to claim 3 which is a longitudinally/transversely stretched flat film.
Claim 6
Dependent Claim
22 words
A film according to claim 1 which is a seamless tubular film stretched in the longitudinal direction and multiaxially at the circumference.
Claim 7
Dependent Claim
16 words
A film according to claim 1 which has an area stretching ratio of up to 20.
Claim 8
Dependent Claim
11 words
A welded bag made from a film according to claim 1.
References Cited (Backward Citations)
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Cited
US3953394B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |