US PATENT SUBCLASS 430 / 150
.~.~ Gaseous development, e.g., ammonia vapor, etc.

Current as of: June, 1999
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430 /   HD   RADIATION IMAGERY CHEMISTRY: PROCESS, COMPOSITION, OR PRODUCT THEREOF

141  DF  DIAZO REPRODUCTION, PROCESS, COMPOSITION, OR PRODUCT {7}
146  DF  .~ Diazo-type process, i.e., producing dye image by reacting the diazo or the imaged reaction product of the diazo {5}
150.~.~ Gaseous development, e.g., ammonia vapor, etc.

DEFINITION

Classification: 430/150

Gaseous development, e.g., ammonia vapor, etc.:

(under subclass 146) Processes wherein the dye image is formed by contacting the imaged medium with a gas or vapor such as ammonia vapor. Usually the coupler is in the medium and the vapor such as ammonia provides a pH which produces an azo dye image.