Patents by Inventor Erling Fjelldal

Erling Fjelldal 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).

  • Fertilizer and process for production thereof
    Patent number: 5976211
    Abstract: A process for producing a fertilizer from an organic waste material is described which comprises treating a waste, having a water content of no more than 90% by weight and which has been alkalinized, with nitrogen dioxide or a precursor thereof in sufficient amount to reduce the pH by at least 2.0 pH units. The process produces an organic fertilizer in which the percentage by weight of nitrogen in the form of oxides of nitrogen is higher than percentage by weight of nitrogen in the form of ammonium ion.
    Type: Grant
    Filed: December 31, 1997
    Date of Patent: November 2, 1999
    Assignee: Agronova A/S
    Inventors: Erling Fjelldal, .O slashed.yvind Vartdal, Svein Slangsvold, Pal Jacobsen