Patents by Inventor Rickie A. Young

Rickie A. Young 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).

  • Hydraulic circuit for crane
    Patent number: 4598829
    Abstract: A hydraulic circuit for a crane having both lift and boom hoist pumps driven by the same engine with appropriate control valves to independently control the lift hooks and the boom angle. An unloading valve is interposed in the boom hoise circuit and dumps the boom hoise pump directly to reservoir when the pressure in the left pump circuit becomes excessive. A boom limit valve, actuated as the boom reaches both upper and lower limits, also causes the unloading valve to dump the boom hoise pump to reservoir.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: July 8, 1986
    Assignee: FMC Corporation
    Inventors: Rickie A. Young, David L. Willard, Gerald P. Berger