Patents by Inventor Marnix Kleefman

Marnix Kleefman 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).

  • Letter opener
    Patent number: D405339
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: February 9, 1999
    Assignee: Pollyflame International B.V.
    Inventor: Marnix Kleefman