Patents by Inventor Eva Haegerstrand

Eva Haegerstrand 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: 5865039
    Abstract: In a method for operating a refrigerating unit including an expeller, condenser, evaporator and absorber, with a solvent circulation, a working substance circulation and a by-gas circulation, the working substance ammonia is expelled from a rich ammonia solution with continuous supply of thermal energy and subsequently is liquefied by heat absorption, is evaporated with absorption of heat from a cooling chamber and is absorbed from the weak ammonia solution, regulation of the thermal energy required for expulsion being effected in dependance on temperature changes with relation to a given temperature of the cooling chamber with the aid of an electronical module using fuzzy logic rules.
    Type: Grant
    Filed: April 23, 1996
    Date of Patent: February 2, 1999
    Assignee: Electrolux Siegen GmbH
    Inventors: Volker Muller, Eva Haegerstrand, Manfred Lorek