Patents Assigned to Safron Printing Company
  • Non-counterfeitable documents
    Patent number: 4176859
    Abstract: An invalidating marking appears on photoreproductions of security documents such as checks, bonds, stock certificates, lottery tickets, and currency. The invalidating marking is disguised on the original by use of disguising markings and printing the invalidating mark and the background with different line screen frequencies.
    Type: Grant
    Filed: May 15, 1978
    Date of Patent: December 4, 1979
    Assignee: Safron Printing Company
    Inventor: Dennis R. Giordano