Patents by Inventor Peter J. Silbernagel

Peter J. Silbernagel 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).

  • Process of producing magnetic recording tape having textured backcoat
    Patent number: 5686142
    Abstract: Coated polymeric sheet comprising polymer substrate a cross-linked polymer, wherein the coating is characterized by:A. being smooth, having a surface roughness not greater than 0.05 nanometers R.sub.a, except that;B. in the otherwise smooth surface, a multiplicity of depressions having depth ranging from 1 to 90% of the thickness of the coating.Backside coatings (containing carbon black in the cross-linked polymer) for magnetic recording tapes benefit from this invention by improved winding characteristics. The concept described is a replacement for rough random surface texture, formerly used in backside coatings, with a controlled surface texture. The process disclosed can also be used to make alphanumeric symbols on the pigment binder coating.
    Type: Grant
    Filed: May 7, 1996
    Date of Patent: November 11, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: David A. Wallack, Donald M. Lewis, John D. Munter, Peter J. Silbernagel, Robert V. Heiti, Yuko Yoshida
  • Magnetic recording medium having an embossed backcoat layer
    Patent number: 5589247
    Abstract: Coated polymeric sheet comprising polymer substrate a cross-linked polymer, wherein the coating is characterized by:A. As being smooth, having a surface roughness not greater than 0.05 nanometers R.sub.a, except that;B. in the otherwise smooth surface, a multiplicity of depressions having depth ranging from 1 to 90% of the thickness of the coating.Backside coatings (containing carbon black in the cross-linked polymer) for magnetic recording tapes benefit from this invention by improved winding characteristics. The concept described is a replacement for rough random surface texture, formerly used in backside coatings, with a controlled surface texture. The process disclosed can also be used to make alphanumeric symbols on the pigment binder coating.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: December 31, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: David A. Wallack, Donald M. Lewis, John D. Munter, Peter J. Silbernagel, Robert V. Heiti, Yuko Yoshida