Patents by Inventor Tord Herlog Ingemar Karlsson

Tord Herlog Ingemar Karlsson 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).

  • Arrangement for air-conditioning of one or more rooms
    Patent number: 3995809
    Abstract: A heating system for a room comprising two heat pumps. A base heat pump is designed so that its evaporator never freezes up or that no frost layer forms during wintertime operation. An auxiliary heat pump is provided and is put into operation during times of extreme cold, whenever the capacity of the base heat pump is not enough to sufficiently heat the room. When the outside heat exchanger of the auxiliary heat pump freezes up, provision is made to reverse the operation of the auxiliary heat pump so the outside heat exchanger becomes the condenser. Thus, the outside heat exchanger is thawed.
    Type: Grant
    Filed: January 21, 1975
    Date of Patent: December 7, 1976
    Assignee: Aktiebolaget Svenska Flaktfabriken
    Inventor: Tord Herlog Ingemar Karlsson