Patents by Inventor Olav Thrap-Olsen

Olav Thrap-Olsen 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).

  • Plant nutrient product
    Patent number: 4776131
    Abstract: The present invention relates to a method of increasing the harvest yield in plant cultivation, the soil being supplied with plant nutrient depots comprising a mixture of bark, and peat, preferably provided with plant nutrient substances (N,P,K) and trace substances, said mixture being composted which are pressed in an extruder press to achieve the formation of pellets and dried to a water content of about 10-15% by weight.
    Type: Grant
    Filed: January 7, 1988
    Date of Patent: October 11, 1988
    Inventors: Erik Haeffner, Olav Thrap-Olsen
  • Burner for particulate fuel
    Patent number: 4611544
    Abstract: The present invention relates to a method for combusting solid fuel in the form of particles, preferably fuel pellets, whereby the fuel is combusted in a rotating combustion chamber (1) whereby the speed of the rotating the chamber is varied so that the fuel periodically releases from the chamber wall and skids along said wall.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: September 16, 1986
    Inventor: Olav Thrap-Olsen