Photographic image definition improvement
US4327172A · kind A · utility
4Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1980 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Dec 16, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/135
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The definition of a photographic emulsion of the positive acting type that would normally produce a positive image is improved by normally exposing the emulsion to actinic radiation and developing the photographic emulsion, bleaching it, exposing the emulsion again to actinic radiation and redeveloping it to reverse the image that would normally result on the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.