Patents by Inventor Orjan E. Valdemar

Orjan E. Valdemar 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).

  • Device in a hydraulic power system connected to a load driving hydraulic motor
    Patent number: 5095806
    Abstract: Device in a hydraulic power system connected to load driving hydraulic motor (18; 32), comprising a pilot controlled flow regulating directional valve (1; 29) for alternative connection of the service ports of the motor (18; 32) to a pressure medium source and a tank. The directional valve (1; 29) comprises two opposite and by a pilot pressure activatable activating means (3, 4), and a pilot pressure means (84) is arranged to pressurize and activate the activating means (3, 4), alternatively, and drain one of the activating means to the tank through a flow restriction (6, 7) at activation of the other activating means (3, 4).
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: March 17, 1992
    Assignee: Atlas Copco Aktiebolag
    Inventors: Orjan E. Valdemar, Bo Nilstam