Patents by Inventor Herbert C. Van der Kolk

Herbert C. Van der Kolk 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).

  • Contact lens and method of making the same
    Patent number: 4318595
    Abstract: A contact lens, particularly a high minus power anterior surface toric lens, is made having a toric central optical portion without prism and an annular outer portion having prism but without toric effect, the outer portion being truncated in a lower part so that there is upward movement of the center of rotation of the blank and of the center of gravity in a manner such that the center of gravity is in use below the center of rotation, thus assisting if the lens is rotated by lid or eye movement the lens tends to rotate back into correct orientation.
    Type: Grant
    Filed: August 28, 1979
    Date of Patent: March 9, 1982
    Assignee: Hirst Contact Lens Limited
    Inventors: Herbert C. Van der Kolk, Martyn W. Davy