Patents by Inventor Dirk Marinus Kerkhoff

Dirk Marinus Kerkhoff 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).

  • Apparatus for aerating and draining
    Patent number: 8734051
    Abstract: An aeration and drainage system includes an aeration & drain pipe which contains slots on its upper surface, a stand which holds said aeration & drain pipe above a bottom surface, an air and liquid transfer element attached to the aeration & drain pipe and positioned over said slots. Additionally the air and liquid transfer element extends upward from the slots, and the air and liquid transfer element contains openings on its top to allow fluids to flow into the air and liquid transfer element and through the slots in the aeration & drain pipe.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: May 27, 2014
    Assignee: Buildworks Systems, Inc.
    Inventors: Dirk Marinus Kerkhoff, J. Cornelis Kerkhoff