Lithographic developer replenishment process
US4025344A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1975 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | May 23, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/31
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Lithographic developer in an automatic photographic film processor is replenished from at least two stable solution concentrates. As each quantity of lithographic film is processed predetermined amounts of the solution concentrates and water are mixed and immediately added to the developer. The solution concentrates, stable before mixing, contain all the constituents needed to replenish the developer solution to maintain activity at a desired level. The amount of each solution concentrate is predetermined from the concentration of each solution concentrate and the quantity and developer requirements of the film. The frequency of replenishment is predetermined from the usage pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.