Patents by Inventor Friedrich Obermeier

Friedrich Obermeier 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).

  • Photoelectric control device for gas burners
    Patent number: 4150941
    Abstract: A device for photoelectrically starting and stopping the operation of a bunsen burner in response to the shadow of an operator's hand holding an object to be heated includes a solenoid valve in a line supplying gas to the burner and electronic control circuitry having secondary and primary photoelectric cells arranged in a differential response circuit. Changes in the intensity of the ambient light are cancelled by the differential response circuit, while a hand shadow, which affects only the primary cell, triggers the solenoid valve, via a gate circuit and solenoid switch.
    Type: Grant
    Filed: September 28, 1977
    Date of Patent: April 24, 1979
    Assignee: Firma Dr. Th. Wieland
    Inventor: Friedrich Obermeier