Process verification in photographic processes
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United States of America Patent
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-
Dec 2, 1997
Grant Date -
N/A
app pub date -
Jun 27, 1996
filing date -
Mar 9, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to the use of multivariate statistical process control as a means of process verification in photographic processes. The method of the present invention allows the process to be controlled in a simple and effective manner by deriving T.sup.2 for a series of variables which impact the material performance characteristics and comparing this value of T.sup.2 with a standard value for the particular system. The contributions of scores to T.sup.2 are used to interrogate changes in monitored process variables and to improve efficacy in maintaining and regaining the system in process control
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