Method and apparatus for controlling the processing of radiation sensitive plates with a liquid by monitoring the electrical conductivity of the liquid
US4577948A · kind A · utility
12Cited by
8References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 20, 1983 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Oct 20, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/3071
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Changes occurring in the electrical conductivity of liquids used to process image-wise exposed radiation-sensitive devices are used as a measure of the deterioration in effectiveness of the liquids. This deterioration is compensated for by varying the processing conditions, such as temperature, time, scrubbing action and processing liquid composition, in accordance with the change in conductivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.