Patents by Inventor Gunter P. Grewe

Gunter P. Grewe 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).

  • Patent number: 4507702
    Abstract: There is provided a control unit for controlling the operation of a fuel valve. The control unit includes a first relay and a second relay. The first relay and the second relay are connectable in series and oppositely actuable. The first relay is actuable in response to a first control signal. The second relay is actuable in response to a second control signal which is inverted with respect to the first control signal. Thus, the relays are differentially operated. Further, there is disclosed a scanner control unit which reduces the noise of a voltage signal whose magnitude is representative of the intensity of a monitored flame in a boiler. The flame scanner control unit uses a comparator to reduce the noise in the voltage signal. The voltage signal is provided at one input of the comparator and a reference signal is provided at the other input of the comparator. The reference signal is representative of the intensity of noise in the boiler when the monitored flame is out.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: March 26, 1985
    Assignee: Tervcon Limited
    Inventor: Gunter P. Grewe