US PATENT SUBCLASS 430 / 558
.~.~.~.~ Heterocyclic coupler

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}
541  DF  .~ Identified radiation sensitive composition with color producing substance {1}
542  DF  .~.~ Silver compound sensitizer {2}
543  DF  .~.~.~ Coupler containing {12}
558.~.~.~.~ Heterocyclic coupler

DEFINITION

Classification: 430/558

Heterocyclic coupler:

(under subclass 543) Compositions containing a coupler having a ring structure composed of different type atoms.

SEE OR SEARCH THIS CLASS, SUBCLASS:

376, particularly 384, 385, 386, 387, 388, and 389 for process involving exposed compositions of this subclass.

449, for nonradiation sensitive compositions applied to exposed compositions of this subclass.

554, for compositions containing a heterocyclic coupler in the form of 2-pyrazolin-5-one.