Black-and-white development processing method with replenishment
US5738979A · kind A · utility
5Cited by
6References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1997 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Jan 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/31
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic silver halide element, such as a radiographic film, can be developed using a black-and-white developing solution containing an ascorbic acid developing agent. This solution is replenished with a replenisher solution of basically the same components but the amounts may be greater. Moreover, the replenisher solution pH is from 0.1 and up to 0.3 pH units higher than that of the developing solution. Both developing and replenisher solutions are free of hydroquinone. Replenishment can be carried out at relatively low rates with less impact on the environment without sacrificing sensitometric performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.