Patents by Inventor Norbert Kordas

Norbert Kordas 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).

  • Integrable conductivity measuring device
    Patent number: 5543717
    Abstract: A conductivity measuring device for measuring the electric conductivity of iquids has a current source device with current electrodes connectable thereto, via which a current can be fed into the liquid, and a measuring circuit connected to two voltage electrodes.In order to reduce measuring errors on account of polarization effects, the current source device in accordance with the invention, generates the current having the rectangular waveform, wherein the measuring circuit is implemented as switched capacitor circuit comprising a measuring capacitor being connectable to and disconnectable from the voltage electrodes via a switch arrangement in time dependency of the path of the current having the rectangular waveform.
    Type: Grant
    Filed: September 21, 1993
    Date of Patent: August 6, 1996
    Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forshung e.v.
    Inventor: Norbert Kordas
  • Integrable conductivity measuring device
    Patent number: 5519323
    Abstract: A conductivity measuring device has a current source device connected to current supply elements through which a substantially square-wave current can be fed into a liquid, and a measuring circuit for determining the voltage drop in the liquid between voltage measuring elements.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: May 21, 1996
    Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung e.v.
    Inventors: Norbert Kordas, Yiannos Manoli