US PATENT SUBCLASS 501 / 13
.~.~ Radiation color change responsive

Current as of: June, 1999
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501 /   HD   COMPOSITIONS: CERAMIC

1  DF  CERAMIC COMPOSITIONS {15}
11  DF  .~ Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions {11}
13.~.~ Radiation color change responsive

DEFINITION

Classification: 501/13

Radiation color change responsive:

(under subclass 11) Compositions which are capable of reversibly changing color or darkening in response to the presence of electromagnetic radiation and which if darkened

thereby fade when the electromagnetic radiation is removed.

(1) Note. Documents classified as originals in this subclass are cross-referenced on the basis of the chemical nature of the glass composition disclosed into subclasses 40, 41+, and/or 53+, as appropriate.

(2) Note. Documents classified as originals in this subclass which disclose optical glass compositions are cross-referenced in subclasses 900+.

SEE OR SEARCH CLASS

252, Compositions,

300, for optical filter compositions and subclass 600 for other radiation sensitive compositions.

430, Radiation Imagery Chemistry: Process, Composition, or Product Thereof, 13, for imaged products containing an image within a transparent base.