Patents by Inventor James I. Masterman

James I. Masterman 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).

  • Control valve
    Patent number: 4471805
    Abstract: A control valve for controlling the flow of fluid to and from a single-acting cylinder and having a metered flow-controlling valve section and a rotatable valve member movable to four different positions to provide four different operations of the single-acting cylinder, namely: rapid advance, slow metered advance, hold and return.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: September 18, 1984
    Assignee: Owatonna Tool Company
    Inventors: James C. Solie, James I. Masterman, Michael T. Landrum, Larry D. Allard
  • Low speed pump
    Patent number: 3992131
    Abstract: A two-stage pump assembly employs a rotary-type gerotor pump combined with a reciprocating axial piston-type pump both mounted on and driven by a common shaft of a motor. A single key drivingly connects the rotor of the gerotor pump and the angle plate of the axial piston pump to the shaft of the motor for simultaneous operation of the two pumps. A wear sleeve is seated on the shaft of the motor and coacts with an oil seal carried by a common wall between the motor and the gerotor housing to prevent leaking of the fluid being pumped.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: November 16, 1976
    Assignee: Owatonna Tool Company
    Inventors: James I. Masterman, James C. Solie, Jan H. Boers, Samuel B. McClocklin