Patents by Inventor Walter Ropstorff

Walter Ropstorff 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: 3970111
    Abstract: An electromagnetic 3-way valve arrangement having two valves, each controlled by a separate armature of a single coil solenoid, is described. The top end of each armature has a self-aligning closing element, and the two armatures are held apart by springs acting against an intermediate member, which also contains the valve seat for the lower armature. When deenergized, these springs act against the armatures to close the upper valve and open the lower valve. When the solenoid coil is partially energized, it moves the lower armature upward to close the lower valve also. When the solenoid coil is fully energized, it moves the upper armature downward to open the upper valve. If desired, the armature can be disposed within the solenoid so that the upper armature is operated at partial energization, and the lower armature at full energization of the solenoid coil.
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: July 20, 1976
    Assignee: Robert Bosch G.m.b.H.
    Inventors: Gerhard Brune, Helmut Staib, Heinrich Kochendorfer, Waldemar Hans, Walter Ropstorff, Heinz Leiber, Lothar Kirstein