Photographic system and process
US4598040A · kind A · utility
Inventors
Key dates
| Filing date | Sep 12, 1983 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Sep 12, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/29
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is provided a developer for use in a one-step process for the development of exposed film resulting in an exposurewise pattern of silver particles which are large enough to be used as printing elements in ink-printing techniques, providing a wide range of densities in the developed film. The developer is based on a buffered system of a developing agent, a sulfinic acid salt of the type HO-R-SO.sub.2.M..times.H.sub.2 O where R is a hydrocarbyl group and M is a cation, and a formaldehyde source, with conventional adjuvants such as anti-fogging agents and the like. Instead of the sulfinic acid salt defined above there may be used any compound which upon dissociation in a aqueous medium results in the same active ionic species.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.