Process for producing phase retarder
US5366682A · kind A · utility
20Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1992 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Dec 9, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/71
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for producing a phase retarder film or sheet, which comprises subjecting a stretched thermoplastic resin film or sheet to thermal relaxation at a temperature not lower than the glass transition temperature of the thermoplastic resin to shrink the film or sheet in the stretching axis direction while suppressing the expansion of the film or sheet in a direction parallel to the film or sheet surface and perpendicular to the stretching axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.