Retardation film
US8846180B2 · kind B2 · utility
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1References
12Claims
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Assignee
Inventors
Key dates
| Filing date | Nov 6, 2009 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Jan 24, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24479
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A retardation film which has few foreign matter defects and small retardation nonuniformity and meets the required quality of a retardation film is provided with high productivity at a low cost by melt extruding a polycarbonate.The retardation film obtained by stretching and orienting a melt extruded film of a polycarbonate is characterized in that:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.