Title:
AUTHENTICITY INDICATOR
Document Type and Number:
WIPO Patent Application WO2005108103
Kind Code:
A3
Abstract:
A rapidly reversing authenticity indicator for substrates such as secure documents, tags and labels is described. The authenticity indicator comprises a substrate having provided thereon a coating of a colorless chromogenic material, a binder material and optional pigment. An applicator is provided containing a developer material solution for the colorless chromogen. In one embodiment, the developer material solution is preferably an organic acid of five carbons or less and is selected to have a molecular weight of 102 or less, a pH of less than 5, and preferably positive vapor pressure. The coated substrate when contacted with the developer material in the applicator develops an intense color that persists momentarily rapidly reverting to substantially a colorless or pale form to provide a visual indication of authenticity without permanent discoloration of the substrate or inadvertent coloration or undue false positives.
Inventors:
APPLETON PAPERS INC (US)
UKPABI PAULINE OZOEMENA (US)
UKPABI PAULINE OZOEMENA (US)
Application Number:
PCT/US2005/008797
Publication Date:
June 08, 2006
Filing Date:
March 16, 2005
Export Citation:
Assignee:
APPLETON PAPER INC (US)
International Classes:
B41M5/30; G09F3/00; G09F3/02
Foreign References:
| US5139572A | 1992-08-18 | |||
| US4680598A | 1987-07-14 | |||
| US4687862A | 1987-08-18 |
Other References:
See also references of EP 1755900A4
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