Patents by Inventor Andreas Ehrenfels

Andreas Ehrenfels 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).

  • Electromagnet, specially for actuating valves
    Patent number: 6344783
    Abstract: An electromagnet for actuating valves includes a sheath-like magnet housing encompassing a pole core forming a one-sided closure of the housing. The housing is connected to the pole core by an annular groove in its periphery, by an O-ring accommodated in the groove as a sealing element and by an annular groove in the magnet housing. The magnet housing forms bearing surfaces joined in positive fit to the inner walls of the annular groove and a sealing surface located on the O-ring.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: February 5, 2002
    Assignees: Hydraulic-Ring GmbH, Hydac Electronic GmbH
    Inventors: Rolf J. Neuhaus, Kurt R. Stratil, Andreas Ehrenfels, Frank Kattler, Hans-Jurgen Pauly