Patents by Inventor Marinus Johannes Langkruis

Marinus Johannes Langkruis 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).

  • Portable fencing system
    Patent number: 5813662
    Abstract: A portable fencing system includes a plurality of fence sections each of which terminates in feet which are selectively mounted in base blocks. Each base block includes a section made in the form of a skin having a hollow chamber therein with filler material inserted in the chamber.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: September 29, 1998
    Assignee: Cramaro Tarpaulin Systems, Inc.
    Inventor: Marinus Johannes Langkruis