Patents by Inventor Westvaco Corporation

Westvaco Corporation has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4766841
    Abstract: This process is directed to the coloration of envelope and stationery grades of white paper stocks with a water based ink coating. Characteristics of the flexographic process include both press and ink specifications. Critical mechanical or material characteristics are associated with each of the fountain roll, the anilox roll, the plate roll and the impression roll of a flexographic printing system. Used in conjunction with the critical combination of press characteristics is a unique, water-based ink formulation for rapidly coloring an entire web side with a colored ink to simulate the appearance of a colored paper stock.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: August 30, 1988
    Inventors: Richard C. Brown, Robert E. Lafler, Joseph M. Murphy, Westvaco Corporation