Patents by Inventor Chris R. Spann

Chris R. Spann 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).

  • Power steering gear and open center rotary valve therefor
    Patent number: 4454801
    Abstract: This power steering valve has new routing for return oil by elongating predetermined slots in the valve body to axially circumvent end ring elements interposed between the valve spool and valve body. With the provision of axial return paths, radially drilled return holes in the valve spool and spool shaft are eliminated.
    Type: Grant
    Filed: May 7, 1982
    Date of Patent: June 19, 1984
    Assignee: General Motors Corporation
    Inventor: Chris R. Spann