Patents by Inventor David A. Ludwig

David A. Ludwig 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: 4848939
    Abstract: A bearing shim comprising a first end plate, a second end plate and a plurality of spacer elements disposed therebetween. The first end plate includes an axially elongated annular rib adapted to be received within apertures in the spacers and the other end plate. Preferably, the annular rib peripherally circumscribes a bore within the first end plate adapted to receive a rotatably mounted axle therethrough.
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: July 18, 1989
    Assignee: Ring & Pinion Sales, Inc.
    Inventor: David A. Ludwig
  • Patent number: D371590
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: July 9, 1996
    Inventor: David A. Ludwig