Light absorbing layer for photo-chromic systems

Details Light absorbing layer for photo-chromic systems Light absorbing layer for photo-chromic systems

Filed on

2011-08-30

Date issued

2011-08-30

Examiner

Shewareged, Betelhem (Department: 1785)

Patent Class

Stock material or miscellaneous articles

SubClass

Structurally defined web or sheet

SubSubClass

Discontinuous or differential coating, impregnation or bond

Other Related Categories

C428S213000, C428S412000, C428S423100, C428S446000, C428S473500, C428S474400, C428S480000, C428S484100, C428S500000, C428S913000

Type

Reexamination Certificate

Status

active

Patent number

08007900

Description

ABSTRACT:
A composition which comprises a light absorbing layer adhered to an underlying layer containing a photo-chromic colorant, which photo-chromic colorant has been activated by exposure to UV light to undergo a reversible color change, and wherein the rate of color reversion is dependent on temperature, is provided. The ultraviolet light and/or visible light absorbing layer may also contain components which reflect rather than absorb light and can be conveniently applied via thermal transfer or ink jet to a substrate comprising the photo-chromic colorant to protect it from unwanted exposure to UV and/or certain wavelengths visible light. The composition is conveniently employed in a temperature time indicator (TTI).

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