Patents by Inventor Philip J. Leider

Philip J. Leider 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).

  • Spiral groove pattern refiner plates
    Patent number: 4023737
    Abstract: The bar and channel pattern of a disc refiner plate follows the curve of a continuous circular arc from the stock distribution ring groove to the outer plate periphery. Each channel is of constant sectional flow area to provide uniform flow area into and out of the refiner section.
    Type: Grant
    Filed: March 23, 1976
    Date of Patent: May 17, 1977
    Assignee: Westvaco Corporation
    Inventors: Philip J. Leider, Jorg Rihs