Patents by Inventor Alfred Prechtl

Alfred Prechtl 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).

  • Apparatus to transfer heat or refrigerant
    Patent number: 4143523
    Abstract: The invention relates to an apparatus for the transfer of heat or refrigerant between two separate flows of fluid, by means of a heat pump incorporating a refrigeration cycle. The refrigeration apparatus comprises an evaporator, a compressor, a condenser and a regulating valve, the evaporator and the condenser being adapted for heat exchange with the two separate fluid flows. During a heating operation, one of the fluid flows, before entering the evaporator, is brought into heat exchange in a first heat exchanger with the refrigeration cycle between the condenser and the regulating valve.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: March 13, 1979
    Inventors: Manfred R. Burger, Ernst Gagel, Rudolf Kalmovicz, Alfred Prechtl
  • Method to transfer heat or refrigerant and heat pump for practical application of this method
    Patent number: 4065937
    Abstract: The invention relates to a method for the transfer of heat or refrigerant between two separate flows of fluid, by means of a heat pump incorporating a refrigeration cycle. The refrigeration cycle comprises an evaporator, a compressor, a condenser and a regulating valve, the evaporator and the condenser being adapted for heat exchange with the two separate fluid flows. During a heating operation, one of the fluid flows, before entering the evaporator, is brought into heat exchange in a first heat exchanger with the refrigeration cycle between the condenser and the regulating valve.
    Type: Grant
    Filed: January 21, 1976
    Date of Patent: January 3, 1978
    Inventors: Manfred R. Burger, Ernst Gagel, Rudolf Kalmovicz, Alfred Prechtl