Patents by Inventor Hugh J. MacKenzie

Hugh J. MacKenzie 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: 4324411
    Abstract: A level lift system for an implement in which a main frame is flexibly connected to outrigger frames with a wheel assembly carried by each frame. A hydraulic ram is operably connected between each frame and the associated wheel assembly with the rams connected in parallel and with a rotary flow divider interposed in the connection with one end of said rams, whereby fluid pressure is directed to said one end when connected with a pump and fluid is exhausted from said one end when connected with a reservoir. Flow to and from said one end being at substantially equal rates regardless of the relative resistance encountered by said rams.
    Type: Grant
    Filed: June 5, 1980
    Date of Patent: April 13, 1982
    Assignee: International Harvester Company
    Inventor: Hugh J. MacKenzie