Patents by Inventor Johannes Willem Douma

Johannes Willem Douma 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).

  • Go kart
    Patent number: D778369
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: February 7, 2017
    Assignee: Berg Toys Beheer B.V.
    Inventors: Johannes Willem Douma, Hendrik van den Berg
  • Chain guard
    Patent number: D778789
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: February 14, 2017
    Assignee: Berg Toys Beheer B.V.
    Inventors: Johannes Willem Douma, Hendrik van den Berg