Patents by Inventor David Duane Johnson

David Duane Johnson 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).

  • Silicone copolymers, methods of making, and articles
    Patent number: 10941252
    Abstract: A copolymer composition that includes a silicone copolymer, methods of making the composition, and articles that include the composition, wherein the copolymer composition includes a silicone copolymer having a backbone composition that includes: silicone segments in an amount of 5 wt-% to 40 wt-%, based on the total weight of the silicone copolymer; hydrophilic segments in an amount of 40 wt-% to 75 wt-%, based on the total weight of the silicone copolymer; and reinforcing segments in an amount of 5 wt-% to 30 wt-%, based on the total weight of the silicone copolymer, wherein the reinforcing segments are derived from the reaction of one or more chain extenders with one or more multi-functional isocyanates, multi-functional carboxylic acids, multi-functional anhydrides, multi-functional esters, and/or multi-functional acid halides; wherein the silicone segments, hydrophilic segments, and reinforcing segments are connected through urea, urethane, amide, and/or oxamide linkages; wherein the hydrophilic segments
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: March 9, 2021
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Hannah C. Cohen, Amanda C. Engler, Ranjani V. Parthasarathy, Haoming Rong, Ramesh C. Kumar, Matthew T. Scholz, James P. Dizio, Audrey A. Sherman, Richard G. Hansen, Douglas A. Hanggi, Dale J. Case, David Duane Johnson