US PATENT SUBCLASS 430 / 521
.~.~.~ Anthraquinone or quinhydrone

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

495.1  DF  RADIATION SENSITIVE PRODUCT {7}
510  DF  .~ Antihalation or filter layer containing {4}
517  DF  .~.~ Organic dye or pigment containing {5}
521.~.~.~ Anthraquinone or quinhydrone

DEFINITION

Classification: 430/521

Anthraquinone or quinhydrone:

(under subclass 517) Subject matter wherein the organic dye or pigment contains the anthraquinonyl nucleus, i.e., diphenylene-orthodiketone not having any benzene nucleus fused thereon, or is a quinhydrone, i.e., the complex equilibrium mixture of products resulting from the interaction of an equimolar mixture of a quinone and a hydroquinone.