×

Coded identification card and other standardized documents

  • US 5,522,623 A
  • Filed: 06/07/1995
  • Issued: 06/04/1996
  • Est. Priority Date: 03/29/1990
  • Status: Expired due to Fees
First Claim
Patent Images

1. A laminated document comprising,an upper lamina or top layer essentially opaque to visible light, said top layer having an upper or front surface imprinted with human-visible indiciae with a pigment-free, non-aqueous printing medium which absorbs and reflects wavelengths in a range from 4000 Å

  • to 7000 Å

    , said top layer and printing medium being permeable to a preselected wavelength in the range of infrared or ultraviolet regions;

    a lower lamina or base layer having an upper reflective surface which reflects said preselected wavelength as a reflected wavelength through said top layer, and a lower surface;

    machine-scannable coding indiciae concealed by said top layer from human view in an intermediate zone between said lower surface of said top layer and said upper surface of said base layer said machine-scannable coding indicia being fixedly imprinted in said zone with material which absorbs said preselected wavelength incident upon said coding indicia;

    said human-visible indiciae being imprinted over an area overlapping said machine-scannable coding indicia;

    whereby said coding indicia is read with a scanning means using said preselected wavelength, and sensitive to the contrast between signals from said coding indicia and said reflective surface.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×