Patent US3595836A successfully refreshed from Google Patents.
US3595836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a dimensionally stable polyester film and article thereof
Assignee: Kalle GmbH and Co KG
•
Filing: 1968-05-29
•
Granted: 1971-07-27
•
Expires: 1988-05-29
Abstract
Abstract THIS INVENTION RELATES TO A PLANAR, DIMENSIONALLY STABLE POLYETHYLENE TEREPHTHALATE FILM AND A PROCESS FOR THE PRODUCTION OF THE SAID PLANAR, DIMENSIONALLY STABLE POLYETHYLENE TEREPHTHALATE FILM WHICH COMPRISES STRETCHING AN AMORPHOUS POLYETHYLENE TEREPHTHALATE FILM, HAVING A MEAN MOLECULAR WEIGHT LESS THAN 13,500, BY AT LEAST 200 PERCENT IN ORTHOGONAL DIRECTIONS OF THE FILM PLANE AT A TEMPERATURE IN THE RANGE OF 85 TO 95*C., WITH A FORCE OF NOT MORE THAN 0.5 KG./MM.2, AND THEN HEATING THE FILM UNDER TENSION TO A TEMPERATURE OF AT LEAST 200*C. FOR AT LEAST FIVE SECONDS.
Inventors
- 👤 Wolfgang Korneli
- 👤 Walter Seifried
- 👤 Eberhard Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:00
CPC Classifications
B; B29; B29C; B29C55/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |