US PATENT SUBCLASS 430 / 556
.~.~.~.~ Open chain keto- methylene 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}
556.~.~.~.~ Open chain keto- methylene coupler {1}
557  DF  .~.~.~.~.~> Substituted at coupling position with other than hydrogen

DEFINITION

Classification: 430/556

Open chain keto-methylene coupler:

(under subclass 543) Compositions containing a coupler in the form of an open chain ketomethylene compound.

SEE OR SEARCH THIS CLASS, SUBCLASS:

388, for process involving yellow dye formation.

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