Patents by Inventor Hans-Jürgen Ludewig

Hans-Jürgen Ludewig 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: 6390125
    Abstract: A manually-operated valve is provided in series with an electromagnetically-operated valve and the manually-operated valve is provided with a proximity detector connected to the electronic controller whereby a switch in the manually-operated valve, in one position of the single control lever therefor, corresponding to about 50% of maximum supply rate, is operated to activate the proximity sensor and enable the water flow to be controlled by an object within its detection range. Removal of the object, e.g. the hand of the user from the range, will shut off the water through the manually-operated valve. Outside the position of the lever at which the switch is operated, the proximity detector is ineffective and control is effected exclusively by swinging the lever.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: May 21, 2002
    Assignee: Friedrich Grohe AG & Co. KG
    Inventors: Manfred Pawelzik, Hans-Jürgen Ludewig, Wolfgang Gebhardt, Hartwig Philipps-Liebich