Patents by Inventor Raymond H. Sierk

Raymond H. Sierk 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).

  • Detachable wear pad for the third rail shoe on an electric railway car
    Patent number: 4023658
    Abstract: The wear pad of a third rail shoe for an electric railway car has the electrode opening therein so configured as to tip the electrode substantially to the attitude of the overhead cable attached to the electrode.
    Type: Grant
    Filed: March 17, 1976
    Date of Patent: May 17, 1977
    Assignee: Abex Corporation
    Inventor: Raymond H. Sierk