Patents by Inventor Birgitta Hacker

Birgitta Hacker 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).

  • Gas sensor
    Patent number: 6101865
    Abstract: A porous Al.sub.2 O.sub.3 thick film covers the SrTiO.sub.3 layer of an oxygen sensor, said SrTiO.sub.3 layer being contacted by means of two Pt electrodes and deposited on an Al.sub.2 O.sub.3 substrate. The electrically insulating Al.sub.2 O.sub.3 layer bears a protective layer, which is exposed to the exhaust gas and is preferably also made of SrTiO.sub.3. This construction ensures that the output signal of the sensor representing the oxygen partial pressure then depends only on the resistance or, respectively, conductivity value of the non-contaminated SrTiO.sub.2 sensor layer.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: August 15, 2000
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hans Meixner, Susanne Kornely, Dieter Hahn, Hermann Leiderer, Bertrand Lemire, Birgitta Hacker