Patents by Inventor Stig Svennberg

Stig Svennberg 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).

  • Ethanol fuel and the use of an ignition improver
    Patent number: 5628805
    Abstract: The ignition of an aqueous ethanol fuel is essentially improved by using a water soluble adduct of a polyol having 3-10 hydroxyl groups and ethylene oxide and/or propylene oxide, the molecular weight of the adduct being 350-10,000. The fuel is in the form of a solution and contains 70-96% by weight of ethanol, 2-10% by weight of water and 0.5-20% by weight of the ignition improving adduct.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: May 13, 1997
    Assignee: Akzo Nobel nv
    Inventors: Anna Lif, Stig Svennberg
  • Surfactant, process for its production and use
    Patent number: 5523470
    Abstract: A new class of surfactants exhibits properties, which make the surfactants suitable for use in surfactant flooding for enhanced oil recovery. The surfactants have the formulaXA.sub.r ORSO.sub.3.sup.- M.sup.+ (I)where R is a hydrocarbon or hydroxyl-substituted hydrocarbon group with 2-6 carbon atoms; A is an oxyalkylene group having 2-4 carbon atoms; r is a number from 0-10, preferably 0-5 and most preferably 1-4; X is an hydroxyl group or hydroxyl and ether group containing hydrophobic group, which comprises 2-6, preferably 2-4 end groups containing 3-22 carbon atoms; and M is a cation, preferably a monovalent cation; or a C.sub.1-4 -alkyl ether thereof. A method for the manufacture of the surfactants are also enclosed.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: June 4, 1996
    Assignees: Berol Nobel AB, Den norske stats oljeselskap a.s.
    Inventors: Leif Karlsson, Per-Erik Hellberg, Lena Eriksson, Stig Svennberg, Eimund Gilje, Siri Espedal, Trygve Maldal