Patents by Inventor Fritz Hetzer

Fritz Hetzer 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).

  • Differential pressure threshold detector
    Patent number: 4130745
    Abstract: A differential pressure threshold detector in which a reed switch is arranged eccentrically in a housing which can be mounted on a housing containing an axially movable control magnet in either of two positions so that the axes of the reeds lie substantially parallel to the axial path of the magnet and in one position movement of the magnet acts to close the switch whereas in the other position movement of the magnet acts to open the switch.
    Type: Grant
    Filed: August 23, 1977
    Date of Patent: December 19, 1978
    Assignee: Purolator Filter G.m.b.H.
    Inventor: Fritz Hetzer