Color absorption-type filter and method of making
US4354739A · kind A · utility
31Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1980 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Sep 3, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/898
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A contrast enhancement filter is produced by photographic reproduction of a master filter on to positive color transparency film. The master filter may be a multilayer thin film optical filter. The developed positive color transparency film may be laminated between a pair of glass sheets with layers of an ultraviolet absorbing polymer material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.