Patents by Inventor Henrik Skifs

Henrik Skifs 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).

  • Synthesis of ammonium dinitramide, ADN
    Patent number: 10112834
    Abstract: The invention concerns a method for making ADN from GUDN in one single process step. GUDN is reacted with an ammonium source (ammonium-sulfamate, ammonium-sulfate, ammonia) and an ion-change gives ADN from GUDN in one process stage. The advantages are that the process gives pure ADN without potassium contaminants and that a smaller amount of solvent is necessary.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: October 30, 2018
    Assignee: TOTALFOERSVARETS FORSKNINGSINSTITUT
    Inventors: Jonas Johansson, Nikolaj Latypov, Stefan Ek, Martin Skarstind, Henrik Skifs
  • SYNTHESIS OF AMMONIUM DINITRAMIDE, ADN
    Publication number: 20170008768
    Abstract: The invention concerns a method for making ADN from GUDN in one single process step. GUDN is reacted with an ammonium. source (ammonium-sulfamate, ammonium-sulfate, ammonia) and an ion-change gives ADN from GUDN in one process stage. The advantages are that the process gives pure ADN without potassium contaminants and that a smaller amount of solvent is necessary.
    Type: Application
    Filed: January 29, 2015
    Publication date: January 12, 2017
    Applicant: Totalforsvarets forskningsinstitut
    Inventors: Jonas JOHANSSON, Nikolaj Latypov, Stefan EK, Martin SKARSTIND, Henrik SKIFS
  • Method of producing salts of dinitramidic acid
    Patent number: 7981393
    Abstract: A method of preparing salt of dinitramidic acid, comprising nitration of an initial compound with a nitrating acid mixture to form dinitramidic acid in a reaction mixture. A positive ion is added to the reaction mixture and forms with the dinitramide ion an ion pair complex which precipitates in the acidic reaction mixture, and the precipitate is separated from the mixture. The remaining spent acid can be reprocessed for recovery of acid for preparation of a new nitrating acid mixture. The preferred positive ion is the guanylurea ion which gives a precipitate of guanylurea dinitramide. The precipitate can be used as starting material for preparation of other dinitramide salts, such as KDN and ADN. The guanylurea ion can be formed in situ in the process by cyanoguanidine being reacted with the reaction mixture.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: July 19, 2011
    Assignee: Försvarets Materielverk
    Inventors: Carin Vörde, Henrik Skifs
  • Method of Producing Salts of Dinitramidic Acid
    Publication number: 20080226533
    Abstract: A method of preparing salt of dinitramidic acid, comprising nitration of an initial compound with a nitrating acid mixture to form dinitramidic acid in a reaction mixture. A positive ion is added to the reaction mixture and forms with the dinitramide ion an ion pair complex which precipitates in the acidic reaction mixture, and the precipitate is separated from the mixture. The remaining spent acid can be reprocessed for recovery of acid for preparation of a new nitrating acid mixture. The preferred positive ion is the guanylurea ion which gives a precipitate of guanylurea dinitramide. The precipitate can be used as starting material for preparation of other dinitramide salts, such as KDN and ADN. The guanylurea ion can be formed in situ in the process by cyanoguanidine being reacted with the reaction mixture.
    Type: Application
    Filed: January 21, 2005
    Publication date: September 18, 2008
    Inventors: Carin Vorde, Henrik Skifs