Patents by Inventor Douglas W. MacLeod

Douglas W. MacLeod 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).

  • Direct acting hydraulic dust stop
    Patent number: 3949972
    Abstract: Four hydraulic cylinders are mounted on support segments at approximately 90.degree. intervals about the sealing gland ring of an internal rotary mixer. The piston rods of the hydraulic cylinders directly engage the gland ring and the cylinders are supplied by a static hydraulic system. The hydraulic system supplies a pair of cylinder assemblies on either end of the rotor shaft thereby providing a continuously balanced force to the gland rings.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: April 13, 1976
    Assignee: USM Corporation
    Inventors: Wilson A. Bell, Douglas W. MacLeod