Patents by Inventor Karel C. van Waveren

Karel C. van Waveren 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).

  • Patent number: 4564319
    Abstract: A flexible tube for conveying a mixture of a liquid or solid material containing objects with sharp points, edges or similar projections, the internal wall part of said tube consisting of an elastic material, especially rubber, in which a wearproof material is present in the shape of rod-shaped elements which are provided essentially parallel and at a distance form one another in said internal wall part in such a way that they extend themselves between the inner and the outer surface of said internal wall part, the shortest distance between the most closely spaced wall parts of said elements being at least equal to the greatest dimension (D) of the rod-shaped elements as seen in the radial direction of said elements.
    Type: Grant
    Filed: October 9, 1981
    Date of Patent: January 14, 1986
    Assignee: Vredestein N.V.
    Inventor: Karel C. van Waveren