Patents by Inventor Steen R. Christoffersen

Steen R. Christoffersen 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).

  • Process and catalyst for determining nitrogen in a sample according to the Kjeldahl principle
    Patent number: 4229180
    Abstract: An antimonate, such as potassium antimonate, is used as the destruction catalyst in nitrogen determinations according to the Kjeldahl principle. Preferred catalyst comprises potassium antimonate together with potassium sulfate (for increasing the boiling point of the destruction mixture) and minor amounts of zinc sulfate and cupric sulfate (as co-catalysts).
    Type: Grant
    Filed: October 6, 1978
    Date of Patent: October 21, 1980
    Assignee: A/S N. Foss Electric
    Inventors: Steen R. Christoffersen, Ole-Christian Bjarno