Polyester film
US6436219B1 · kind B1 · utility
15Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 2000 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | May 5, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A polyester film having an opaque first polyester layer having an optical density greater than 2.0 and a second white polyester layer, wherein the film is made by coextrusion. The opaque first layer preferably contains carbon black. The film is suitable for use as a base for a photographic sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.