Patents by Inventor Donald E. Cadwell

Donald E. Cadwell 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).

  • Lithographic plate
    Patent number: 4687729
    Abstract: Printing plates made from ceramic-coated, steel-based, lithographic plate precursors. The printing plate of this invention is a lithographic plate comprising a steel substrate, an adhesion promoting layer overlying the steel substrate, a ceramic layer overlying the adhesion promoting layer, and a photosensitive layer coated over the ceramic layer. The steel-based plate is more durable than aluminum based plates.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: August 18, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Donald E. Cadwell, Larry A. Brey
  • Lithographic substrate and its process of manufacture
    Patent number: 4542089
    Abstract: Lithographic printing substrates ordinarily require a mechanical or chemical graining of aluminum surfaces. Such substrates are difficult and expensive to make. It has been found that lithographically suitable substrates can be prepared by the firing of monobasic phosphate solutions with dispersed particles therein. The presence of reactive metallic oxides enhances the properties of the surface.
    Type: Grant
    Filed: April 9, 1984
    Date of Patent: September 17, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Donald E. Cadwell, Larry A. Brey
  • Lithographic substrate and its process of manufacture
    Patent number: 4457971
    Abstract: Lithographic printing substrates ordinarily require a mechanical or chemical graining of aluminum surfaces. Such substrates are difficult and expensive to make. It has been found that lithographically suitable substrates can be prepared by the firing of monobasic phosphate solutions with dispersed particles therein. The presence of reactive metallic oxides enhances the properties of the surface.
    Type: Grant
    Filed: August 26, 1982
    Date of Patent: July 3, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Donald E. Cadwell, Larry A. Brey
  • Lithographic substrate and its process of manufacture
    Patent number: 4420549
    Abstract: Lithographic printing substrates ordinarily require a mechanical or chemical graining of aluminum surfaces. Such substrates are difficult and expensive to make. It has been found that a lithographically suitable substrate on an aluminum surface can be provided by the firing of monoaluminum phosphate solutions on substrates having an aluminum surface.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: December 13, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Donald E. Cadwell