Dry working photographic process relating to N-vinyl compound system
US3953210A · kind A · utility
5Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1974 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Jul 23, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/108
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film coated with a dispersion of an N-vinyl compound, an organic halogen compound and a sensitizer in gelatin is preheated at 60.degree.-120.degree.C before an imagewise exposure to sensitize the film and to destroy fog-nuclei. After the imagewise exposure the film is subjected to a red light flood exposure for intensifying latent image, heating for development and flood light exposure for fixing to give a negative image of high contrast. The preheating may be applied to a film once exposed to extinguish the resulting latent image and thereby to be subjected to another exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.