Patents by Inventor Aaro I. Louhio

Aaro I. Louhio 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 motor
    Patent number: 4398450
    Abstract: A hydraulic motor with two sets of cylinders, the diameters of the two cylinder sets being of different dimension in order to produce three speed ranges. The pressure medium is directed to either both cylinder sets, the cylinder set of larger diameter of the cylinder set of smaller diameter by means of a valve structure comprising sliding spindles arranged in the hollow center axle of the motor, the pressure force of the pressure medium being utilized for moving the valve spindles.
    Type: Grant
    Filed: July 30, 1980
    Date of Patent: August 16, 1983
    Assignee: Oy Partek AB
    Inventor: Aaro I. Louhio