Patents by Inventor Gerhard Bisail

Gerhard Bisail 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).

  • Level sensor which has high signal gain and can be used for fluids particularly chemically corrosive fluids
    Patent number: 5142267
    Abstract: A PTC-resistor which is a temperature dependent electrical thermistor of semiconductor ferro-electric ceramic which is provided with power leads and serves as a sensor element is directly fused into glass. The power leads are welded to metal coatings formed on the PTC-resistor which are stable at the temperature occurring when the PTC-resistor is fused. The metal coatings are made of aluminum which are formed by aluminum silk screened metallizations which have a thickness of 50 .mu.m or more.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: August 25, 1992
    Assignee: Siemens Aktiengesellschaft
    Inventors: Siegfried Fellner, Gerhard Bisail