Patents by Inventor Robert Van Der Leij

Robert Van Der Leij 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).

  • Cantilevered roof construction
    Patent number: 5815989
    Abstract: A roof construction with a number of roof elements coupled together to form an up and down, essentially corrugated construction. The connection point of the roof elements is in the region of the neutral line. In this way particularly large spans can be achieved without special measures.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: October 6, 1998
    Inventors: Hendrik Willem Bennenk, Johannis Istha, Robert Van Der Leij