Polyethylene terephthalate photographic film base
US5607826A · kind A · utility
3Cited by
11References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1994 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Sep 13, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C55/143
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides an improved polyethylene terephthalate photographic film base having excellent dimensional stability, optical clarity and mechanical strength while also possessing a crystalline configuration that enables finishing by cutting, chopping or perforating techniques at reduced fracture resistance with decreased generation of dirt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.