Patents by Inventor Hans-Jurgen Ludewig

Hans-Jurgen 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
  • Publication number: 20010011560
    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: Application
    Filed: January 24, 2001
    Publication date: August 9, 2001
    Applicant: Friedrich Grohe AG & Co. KG
    Inventors: Manfred Pawelzik, Hans-Jurgen Ludewig, Wolfgang Gebhardt, Hartwig Philipps-Liebich
  • Patent number: 5829072
    Abstract: An automatic shower control for the flow to a shower head by a detection device and its control and evaluation circuitry which detects the presence of a user and includes switching device for activation and deactivation of the control. An intensity selective evaluation of the detector signal indicates whether the signal derives from an object in a close proximity range or a normal proximity range to the detector and the system is switched on by the presence of an object in the close proximity range. During operation in the normal proximity range, which can terminate when the user leaves this range, water shut off can also be effected by movement of an object into the close proximity range.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: November 3, 1998
    Assignee: Friedrich Grohe AG
    Inventors: Heinz Hirsch, Heinz-Dieter Eichholz, Hans-Jurgen Ludewig, Gunter Kolbert
  • Patent number: 5743511
    Abstract: A sanitary fixture permits a battery to be packaged with a control and evaluation circuit and a proximity detector for automatic control of a valve. The circuit is set at the factory after final testing with the battery in place to an energy-sparing mode which is maintained, e.g. by a sticker over the receiver of the infrared proximity detector. The normal mode is activated by an infrared signal applied when the unit is installed.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: April 28, 1998
    Assignee: Friedrich Grohe AG
    Inventors: Heinz-Dieter Eichholz, Hans-Jurgen Ludewig, Hans-Peter Rudrich
  • Patent number: 5174495
    Abstract: An apparatus usable in combination with a mixing valve having hot- and cold-water inlets and a mixed-water outlet and a actuating drive for operating the valve to change the blend of hot and cold water at the outlet. The apparatus controls and sets the valve via the actuating drive and has a sensor at the outlet for producing an actual-value output corresponding to the temperature of the water at the output, a digital computer, a line connecting the computer to the sensor and to the actuating drive, a display for indicating settings of the computer, a removable program module engageable in the computer for supplying a valve- and user-specific program thereto, and an input panel connected to the computer for programming same.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: December 29, 1992
    Assignee: Friedrich Grohe Armaturenfabrik GmbH & Co.
    Inventors: Heinz-Dieter Eichholz, Hans-Jurgen Ludewig