Patents by Inventor Craig Silvernagel

Craig Silvernagel 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).

  • Connector device for promoting building skills
    Patent number: D949979
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: April 26, 2022
    Assignee: South Dakota Board of Regents
    Inventors: Angela McKillip, Todd Letcher, Roxanne Lucchesi, Craig Silvernagel, Barb Heller, Kay Cutler, Chris Hume, Abigail Vaz, Maggie Smither, Elisabeth Gordon, Nathan Stang, Angela Heinz, Tyana Gottsleben