US PATENT SUBCLASS 430 / 345
.~.~ Spiropyran dye or dye former

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

332  DF  DYE IMAGE FROM RADIATION SENSITIVE DYE OR DYE FORMER BY DRY PROCESSING, COMPOSITION, OR PRODUCT {6}
338  DF  .~ Composition or product {3}
345.~.~ Spiropyran dye or dye former

DEFINITION

Classification: 430/345

Spiropyran dye or dye former:

(under subclass 338) Subject matter containing a radiation sensitive spiropyran compound, e.g., benzospiropyran, etc.