US PATENT SUBCLASS 430 / 570
.~.~ Spectral sensitizing

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.~.~ Spectral sensitizing {6}
571  DF  .~.~.~> Mixed grain
572  DF  .~.~.~> Multiple sensitizers or supersensitizing {4}
578  DF  .~.~.~> Polyhetero nuclear containing at least three heterocyclic nuclei {1}
580  DF  .~.~.~> Styryl sensitizer
581  DF  .~.~.~> Cyanine sensitizer {2}
591  DF  .~.~.~> Two or more separate ring structures {1}

DEFINITION

Classification: 430/570

Spectral sensitizing:

(under subclass 564) Subject matter containing a material, e.g., cyanine dye, etc., which imparts its radiation adsorption to the silver compound thereby increasing the radiation sensitivity of the silver compound containing emulsion to that portion of the spectrum absorbed by the dye.

(1) Note. A cyanine compound as herein included contains two distinct heterocyclic rings, each of which contains at least one nitrogen atom, with nitrogen atoms of the individual rings being joined through a conjugated acyclic chain of methine groups, the heterocyclic rings themselves being linked through an acyclic chain which contains at least one methine group.

(2) Note. Methine denotes a -C= group.

(3) Note. The term heterocyclic denotes the presence of one or more carbon atoms covalently bonded in a closed ring with at least one atom of oxygen, nitrogen, sulfur, selenium, or tellurium and having no other atoms in the ring.

(4) Note. This and indented subclasses include a precursor which will later be reacted to produce an optical sensitizer.