Patents by Inventor Jan Keyzer

Jan Keyzer 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).

  • Exercise device
    Patent number: D460506
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: July 16, 2002
    Inventors: Marcel Tamminga, Jan Keyzer