Patents by Inventor Heinz Zietemann

Heinz Zietemann 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).

  • Monolithically integratable transistor circuit for limiting transient positive high voltages, such as ESD pulses caused by electrostatic discharges on electric conductors
    Patent number: 5041889
    Abstract: A monolithically integratable transistor circuit for limiting transient positive high voltages on an electric conductor includes a pnp transistor being conductive only upon exceeding a predetermined potential threshold value being positive as compared with a reference potential. The pnp transistor has an emitter terminal connected to an electric conductor, a collector terminal connected to the reference potential, and a base terminal. A parallel circuit is connected between the base terminal and the electric conductor. The parallel circuit has a high-impedance resistor and a first capacitor. A second capacitor is connected between the base terminal and the reference potential.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: August 20, 1991
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hans Kriedt, Heinz Zietemann