Patents by Inventor Johs. Skaadel

Johs. Skaadel 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 spreading granular material, especially fertilizer
    Patent number: 3948443
    Abstract: Granular material, such as a fertilizer, is continuously or intermittently fed into one or several launching tubes and compressed air pulses are introduced at regular time intervals behind each quantity which at any time has been fed into the tube(s), so that part quantities of the material are shot out at a certain rate and over a certain range.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: April 6, 1976
    Assignee: Norsk Hydro a.s
    Inventors: Bjarne Omdal, Johs. Skaadel