Patents by Inventor Lieuwe von der Chys

Lieuwe von der Chys 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).

  • Sheet of roofcovering material and method to apply this sheet in or as a roofcovering
    Patent number: 4617221
    Abstract: Sheet of roofcovering material comprises a porous base-layer with apertures distributed over its surface. The base layer, at its upper side, is provided with a liquid- and/or vapor tight coating, onto which a bituminous adhering layer or a bituminous top layer has been applied.
    Type: Grant
    Filed: November 30, 1984
    Date of Patent: October 14, 1986
    Inventor: Lieuwe von der Chys