Patents by Inventor Dorothy A. Callahan

Dorothy A. Callahan 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).

  • Combination tool
    Patent number: D828135
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: September 11, 2018
    Inventors: John T. Callahan, Jr., Dorothy A. Callahan