Patent · US Active

TTI indicator with balanced photochemical processes

US8403558B2 · kind B2 · utility

6Cited by

4References

20Claims

0Family size

Assignee

BIZERBA GMBH & CO. KG · DE

Inventors

Andre Fuchs · Kandern, DE
Anne Veronica Carrigan · Galfingue, FR

Key dates

Filing date	Dec 17, 2007
Grant date	Mar 26, 2013
Priority date	—
Expiry date	Jan 6, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31855
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention relates to a time temperature indicator comprising a) at least one photo-chromic colorant introduced into and/or atop a matrix substrate and charged by exposure to UV light; b) at least a transparent colorless or a transparent colored light absorbing protecting layer adhered to the underlying layer a) which contains the photo-chromic colorant; characterized in that the light absorbing protecting layer comprises 1-50 wt % of an UV light absorber or an UV light absorber mixture and 0.1-10 wt % of an optical brightener wherein the weight ratio of the UV light absorber and optical brightener is 0.1-10.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.