Coded merchandising coupon
Method of sorting mail using a coded postage stamp
Optically coded document and method of making same
Light sensitive validating identification badge system
Sublimable dye imaging of lottery ticket and commercial game coupon and the like
Optical storage identification card and read/write system
Color document scanner
Method of collecting response data from direct mail advertising
ApplicationNo. 510235 filed on 04/17/1990
US Classes:235/468, Invisible235/432, With printing283/85, Utilizing electromagnetic radiation355/1INCLUDING FIBER OPTICS
ExaminersPrimary: Trafton, David L.
Attorney, Agent or Firm
Foreign Patent References
International ClassesG06K 007/10
AbstractVoidable articles are made with an identification code and a radiant energy responsive material coated over said code. The material is invisible and remains unactivated in ambient light but obscures the identification code upon being exposed to radiant energies such as heat or light from within a particular wavelength range. Printing can be accomplished by imaging light onto a substrate coated with photosensitive material including an infrared absorbing dye. A cancellation device for voiding documents of the present invention is made with a scanner, a comparator and a radiant energy source for exposing the document to activate the energy responsive material on the document.