System for inkless fingerprinting
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United States of America Patent
Stats
-
Oct 31, 1995
Grant Date -
N/A
app pub date -
Jun 30, 1994
filing date -
Jun 30, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition comprising a leuco color-former coupound, a dialkyl phthalate wherein the alkyl group contains 1-3 carbon atoms, a substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color developing substance comprising a phenol/aldehyde condensation product produced by the reaction together of an alkyl-substituted salicylic acid, an alkyl-substituted phenol, and an aldehyde, said condensation product having been reacted with a metal source.
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