Patents by Inventor Christian Frick

Christian Frick 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).

  • Pressure-maintaining valve arrangement for a purge circuit of a closed hydraulic circuit
    Patent number: 10539130
    Abstract: A pressure-maintaining valve arrangement of a purge circuit of a closed hydraulic circuit includes a pressure-maintaining valve configured to be shut off via a pilot valve. In one embodiment, a control pressure chamber, acting in the closing direction, of the pressure-maintaining valve is configured to be relieved via the pilot valve to a tank, and the pressure-maintaining valve is closed via a spring acting in the closing direction. In another embodiment, the valve arrangement includes an additional control pressure chamber acting in the closing direction. The additional control pressure chamber is configured to be loaded via the pilot valve, and the pressure-maintaining valve closes. The pressure of the inlet of the pressure-maintaining valve is used for this purpose.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: January 21, 2020
    Assignee: Robert Bosch GmbH
    Inventors: Christian Frick, Hakan Camurdan, Markus Gepraegs, Stephan Rohde
  • Pressure-Maintaining Valve Arrangement for a Purge Circuit of a Closed Hydraulic Circuit
    Publication number: 20170306946
    Abstract: A pressure-maintaining valve arrangement of a purge circuit of a closed hydraulic circuit includes a pressure-maintaining valve configured to be shut off via a pilot valve. In one embodiment, a control pressure chamber, acting in the closing direction, of the pressure-maintaining valve is configured to be relieved via the pilot valve to a tank, and the pressure-maintaining valve is closed via a spring acting in the closing direction. In another embodiment, the valve arrangement includes an additional control pressure chamber acting in the closing direction. The additional control pressure chamber is configured to be loaded via the pilot valve, and the pressure-maintaining valve closes. The pressure of the inlet of the pressure-maintaining valve is used for this purpose.
    Type: Application
    Filed: February 28, 2017
    Publication date: October 26, 2017
    Inventors: Christian Frick, Hakan Camurdan, Markus Gepraegs, Stephan Rohde