Patents Assigned to UPO Oskeyhtio
  • Device for controlling the formation of frost on cooling radiators and the defrosting of the same
    Patent number: 3946286
    Abstract: A device to be used e.g. in cooling radiators, for monitoring the formation of frost and for defrosting. Frost formed on the cooling radiator causes a change in the quantity of light received by a light receiver from a light transmitter, and when the quantity of light received by said light receiver reaches a predetermined value a unit controlled by the light receiver initiates the drfrosting which continues until all of the frost has molten.
    Type: Grant
    Filed: October 30, 1974
    Date of Patent: March 23, 1976
    Assignee: UPO Oskeyhtio
    Inventors: Paavo Kinnunen, Viljo Lukkarinen