Patents by Inventor Trygve Botnen

Trygve Botnen 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).

  • Fire detection apparatus in a preheater
    Patent number: 4099165
    Abstract: A fire detection apparatus in a rotary regenerative air preheater comprises a plurality of temperature sensitive detectors which produce an electrical signal, and means for differentiating the electrical signals from the detectors. The differentiated signals are passed through a low pass filter having a large time constant and are then fed to a comparator which actuates a signalling device when the low pass filter output signal exceeds a predetermined value.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: July 4, 1978
    Assignee: Svenska Rotor Maskiner Aktiebolag
    Inventor: Trygve Botnen