US3663683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester heat relax processes
Assignee: Eastman Kodak Co
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Filing: 1969-07-09
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Granted: 1972-05-16
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Expires: 1989-07-09
Abstract
Abstract IT HAS BEEN DISCOVERED THAT ORIENTED, HEAT-SET, POLY(ETHYLENE TEREPHTHALATE) FILMS CAN BE HEAT RELAXED AT EXTREMELY HIGH TEMPERATURES (I.E., 300-350*F.), PROVIDED (A) THAT THE EXCPOSURE OF THE FILM TO SUCH TEMPERATURES IS FOR A VERY SHORT PERIOD OF TIME, AND (B) THAT THE FILM IS SUPPORTED AT CLOSELY SPACED INTERVALS (I.E., AT MOST ABOUT 15 INCHES) DURING THE EXPOSURE THEREOF TO SUCH EXTREMELY HIGH TEMPERAURES.
Inventors
- 👤 Alfred E Czerkas
- 👤 Roger B Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:04
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/16; B29C53/18
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |