Patents by Inventor Donald B. Ketcham

Donald B. Ketcham 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).

  • ACRYLIC ADHESIVES HAVING CHEMICAL RESISTANCE
    Publication number: 20180022972
    Abstract: This disclosure is directed at specific acrylic PSA compositions that are capable of resisting a broad array of solvents. Acrylic PSA's primarily derived from C?1#191-C?4#191 acrylate monomers and functional acrylates exhibit a strong resistance to a wide array of solvents, including both polar and non-polar solvents.
    Type: Application
    Filed: November 25, 2015
    Publication date: January 25, 2018
    Inventors: Dong-Wei Zhu, Peter J. Elliott, Donald B. Ketcham, Jingjing Ma, Michael L. Tumey
  • Degausser for tape with plural recorded segments
    Patent number: 5420742
    Abstract: This method produces a tape having a plurality of recorded segments separated by cue tones and having a reduced tendency to generate false cue tones. The method includes applying a layer of a liquid dispersion to a nonmagnetic substrate. The method also includes the steps of orienting the pigment by applying a magnetic field, solidifying the layer of liquid dispersion on the substrate, and applying a demagnetizing field to the layer to neutralize the remanent magnetization.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: May 30, 1995
    Assignee: Minnesota Mining and Manufacturing
    Inventors: Donald B. Ketcham, Robert P. McCollam, Kent R. Kalar