INVENTORS • Brett Lucht, William Euler, Hu Wang
This invention uses polythiophene compounds to determine the genuineness of an article.
Detection of unauthorized replication of genuine documents, e.g., currency, paid admission tickets, visas, food, packaging, paper, pharmaceutical and electronic products.
FEATURES & BENEFITS
The polythiophenes, when used as pigments to mark an item, can indicate the genuineness of the item by exhibiting expected color and fluorescence changes when exposed to temperatures known only to the manufacturer of the item. Controlled, visually detectable color and fluorescent changes are produced.
Items coated with the polythiophenes show no detectable loss of the changed color or will exhibit no detectable loss of the changed fluorescence when after more than one year of storage below the thermochromic transition. The polythiophenes can be dispersed in commercial plastics (polyurethane, polystyrene, polyethylene, etc.) at loss concentrations and retain the controlled reversibility.
The polythiophenes can also be used as a pigment for inks.
Technology is available for licensing.