Patents by Inventor Johan Holger Karlstedt

Johan Holger Karlstedt 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).

  • METHOD AND APPARATUS FOR PROVIDING EFFICIENT HEAT
    Publication number: 20130312945
    Abstract: Disclosed is a method for providing heat that includes preheating an incoming air flow from outside an apparatus in a first channel of a heat exchanger by a flow in a second channel of the heat exchanger, transferring the flow from the second channel outside the apparatus through an exhaust channel, providing heat by the preheated incoming air flow in a heat pump, and transferring in a transfer channel a flue gas flow provided by a burner to the second channel.
    Type: Application
    Filed: January 5, 2012
    Publication date: November 28, 2013
    Inventor: Johan Holger Karlstedt