US PATENT SUBCLASS 356 / 423-- .~.~.~ Disk

US PATENT SUBCLASS 356 / 423
.~.~.~ Disk

Current as of: June, 1999
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356 /	HD	OPTICS: MEASURING AND TESTING

402	DF	BY SHADE OR COLOR {10}
421	DF	.~ With reflective multicolor chart or standard {2}
422	DF	.~.~ Plate {1}
423		.~.~.~ Disk

DEFINITION

Classification: 356/423

Disk:

(under subclass 422) Subject matter wherein the surfaces are disks or sectors which form disks.

SEE OR SEARCH THIS CLASS, SUBCLASS:

243.1+, for reflective standards which do not involve color testing.

SEE OR SEARCH CLASS

434, Education and Demonstration,

98+, for multicolor charts which may be in the form of a disc, which are used for display and instruction purposes, and which may also be used as a standard for the comparison of an unknown color with the colors and their tints and shades formed in or on the disc.