Patents by Inventor Johannes T. Van Leeuwen

Johannes T. Van Leeuwen 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).

  • Protective cover device
    Patent number: 5083599
    Abstract: Cover device for providing a displaceable cover above an opening, a flexible polymer belt which is substantially more rigid in respect of deflection in a transverse direction than in respect of a longitudinal direction, and a displaceable device disposed in the opening and delimited at both sides by the belt. The portion of the belt on both sides of the device is supported only on rollers disposed only adjacent side walls of the opening, whereby the belt is supported only along opposite longitudinal side edges thereof.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: January 28, 1992
    Assignee: Dunlop-Enerka B. V.
    Inventors: Johannes T. Van Leeuwen, Sytze Brouwers