Patents by Inventor Bernardus A. Willemsen

Bernardus A. Willemsen 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).

  • Centerless valve grinding
    Patent number: 4428160
    Abstract: There is provided a valve grinding apparatus for centerless grinding of valves. Two base rollers with parallel axes are driven, and a control roller is centered above the base rollers. The control roller can be raised and lowered and the direction of its axis can be changed in order to cause the valve to be moved longitudinally in either direction. A support means is spaced from the base rollers and supports a different region of the valve stem.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: January 31, 1984
    Assignee: Ingenious Devices Limited
    Inventors: Bernardus A. Willemsen, Ray G. Parnham