US3577510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of deepdrawable,sterilizable polyester film
Assignee: Kalle GmbH and Co KG
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Filing: 1967-10-10
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Granted: 1971-05-04
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Expires: 1987-10-10
Abstract
Abstract THIS INVENTION RELATES TO A PROCESS FOR THE PRODUCTION OF DEEP-DRAWABLE, STERILIZABLE POLYESTER FILM HAVING A GOOD SHELF LIFE IN WHICH STRESS IS APPLIED TO AN AMORPHOUS POLYESTER FILM IN ORTHOGONAL DIRECTIONS IN THE PLANE OF THE FILM, WHEREBY THE FILM IS THINNED TO AT MOST 1/9 OF THE ORIGINAL FILM THICKNESS, AND THE FILM IS THEN AT MOST DOUBLED IN THICKNESS DUE TO RETARDATION AT TEMPERATURES BETWEEN 120* AND 140*C.
Inventors
- 👤 Peter Josef Schmitz
- 👤 Eberhard Werner
- 👤 Walter Seifried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:54
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/003; B29C51/00; B29C51/002; B29K; B29K2067/00; B29K2995/00; B29K2995/0037; B29K2995/0039; B29L; B29L2007/00; B29L2007/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |