Patents Assigned to National Printing and Packaging Company
  • Random screen waterless printing process
    Patent number: 5283154
    Abstract: An improved method of making lithographic reproductions is disclosed. The method involves several improvements over prior processes, including (a) the combination of random plates and a waterless, dry press for halftone, duotone, tritone and four color separation halftone printing, and (b) the use, in duotone, tritone and four color separation halftone printing of random plates exclusively for all the plates involved in the multi-step printing process.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: February 1, 1994
    Assignee: National Printing and Packaging Company
    Inventor: Richard E. Stein