Patents by Inventor Jan Maarten van Helden

Jan Maarten van Helden 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).

  • Dredging vessel
    Patent number: D637543
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: May 10, 2011
    Assignee: IHC Holland IE B.V.
    Inventor: Jan Maarten van Helden