Patents by Inventor Michael tzfeld

Michael tzfeld 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).

  • Apparatus for measuring the flow of a fluid medium
    Patent number: 5187988
    Abstract: Apparatus for measuring the flow of a fluid medium which flows upward through a substantially vertically mounted tube section having a suspended body in the tube section. The vertical position of the suspended body depends on the intensity of the flow. Movement of a magnet, movable with the suspended body, is sensed by a unit which includes a Hall sensor and an electronic evaluation circuit, responsive to the Hall sensor output, develops an output signal corresponding to the flow of the medium.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: February 23, 1993
    Assignee: Fischer & Porter Company
    Inventors: Hans J. Dettmer, Jorg Herwig, Joachim Hagemann, Werner Marchewka, Michael tzfeld