US PATENT SUBCLASS 430 / 588
.~.~.~.~.~.~ Hetero rings bridged or fused to carbocyclic rings

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}
564  DF  .~ Silver compound sensitizer containing {18}
570  DF  .~.~ Spectral sensitizing {6}
581  DF  .~.~.~ Cyanine sensitizer {2}
583  DF  .~.~.~.~ Containing odd number of methine groups {2}
585  DF  .~.~.~.~.~ Three methine groups, i.e., carbocyanines {4}
588.~.~.~.~.~.~ Hetero rings bridged or fused to carbocyclic rings {1}
589  DF  .~.~.~.~.~.~.~> Direct positive

DEFINITION

Classification: 430/588

Hetero rings bridged or fused to carbocyclic rings:

(under subclass 585) Subject matter in which both of the nitrogen containing heterocyclic rings linked by the trimethine chain are fused or bridged to carbocyclic rings,

e.g., [figure]