Patents by Inventor Eugen Hufnagel

Eugen Hufnagel 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: 4759183
    Abstract: A pump supplies via in each case a directional valve with associated pressure balance fluid or pressure medium to a plurality of loads. When the pump power is not sufficient a proportional quantity reduction is achieved at all loads in that the control voltages of the control members for electrical actuation of the directional valves are supplied to a summation stage and the sum voltage is compared in a comparison stage with a limit value corresponding to the maximum pump displacement, whereupon when the limit value is exceeded a control signal is generated with which the stroke of the driven directional valves is reduced.
    Type: Grant
    Filed: December 19, 1986
    Date of Patent: July 26, 1988
    Assignee: Mannesmann Rexroth GmbH
    Inventors: Norbert Kreth, Heinz Torkler, Eugen Hufnagel