Patents by Inventor Rolf E. Hedman

Rolf E. Hedman 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).

  • Solar heat device
    Patent number: 4450830
    Abstract: Solar heat device to transfer heat energy from the sun to a fluid, comprising a frame (1) including an isolated bottom (2), heat absorbing wafers (5) having tubes (4) for the fluid, and a glass sheet (6) on the top surface of the solar heat device.The frame (1) comprises two portions, one of which has a groove (10) provided with a rubber hose (16) located therein to seal the glass sheet (6) between the two portions. The heat absorbing wafer, of the solar heat device has a wave shape increasing from the central tube (4) receiving part thereof and outwardly towards the free edge thereof.
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: May 29, 1984
    Inventors: Rolf E. Hedman, Gunnar Hedman