Patents by Inventor Keith Allan Markwardt

Keith Allan Markwardt 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).

  • Flared neck golf putter head
    Patent number: D400629
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: November 3, 1998
    Inventor: Keith Allan Markwardt