Patents Assigned to Nocopi Inc.
  • Method of rendering documents resistant to photocopying, and anti-copying paper and ink therefor
    Patent number: 4522429
    Abstract: Confidential information is printed, typed or otherwise applied to paper with a color having a reflection spectral response or less than about 10% for light with a wave-length below about 600 millimicrons. The color is sufficiently contrasting with the information to enable the information to be read by the human eye when the document is viewed under white light, but the document cannot be successfully photocopied.
    Type: Grant
    Filed: November 23, 1982
    Date of Patent: June 11, 1985
    Assignee: Nocopi Inc.
    Inventors: Norman A. Gardner, Michael P. Voticky