Patents by Inventor Sven Engstrom

Sven Engstrom 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).

  • USE OF A LIQUID CRYSTALLINE PHASE FOR DETERMINING THE DISTRIBUTION OF A CHEMICAL SUBSTANCE BETWEEN A HYDROPHOBIC AND A HYDROPHILIC ENVIRONMENT
    Publication number: 20020006436
    Abstract: The invention refers to the use of a cubic liquid crystalline phase for determining the distribution of a chemical substance between a hydrophobic and a hydrophilic environment. The hydrophobic environment is represented by a bilayer of lipids in the cubic crystalline phase and the hydrophilic environment is represented by a hydrophilic phase in equilibrium with the cubic phase.
    Type: Application
    Filed: August 13, 1999
    Publication date: January 17, 2002
    Inventors: SVEN ENGSTROM, RONNIE WALLIN, TOMAS NORDEN PETERSSON
  • Method of preparing controlled-release preparations for biologically active materials and resulting compositions
    Patent number: 5753259
    Abstract: A method and product for preparing a controlled-release composition are provided. The method comprises formation of a mixture containing at least one amphiphilic substance capable of forming a liquid crystalline phase, in contact with a liquid selected from the group consisting of water, glycerol, ethylene glycol, propylene glycol and mixtures thereof. The method includes a step of providing in such mixture a bioactive material.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: May 19, 1998
    Assignee: GS Development AB
    Inventors: Sven Engstrom, Kare Larsson, Bjorn Lindman
  • Controlled release composition for a biologically active material dissolved or dispersed in an L2-phase
    Patent number: 5371109
    Abstract: The invention relates to a controlled-release composition for a biologically active material, wherein said active material has been dissolved or dispersed in an L2-phase comprising(a) at least one monoglyceride of an unsaturated fatty acid having 16-22 carbon atoms or a vegetable or animal oil containing such a monoglyceride,(b) at least one triglyceride of at least one unsaturated fatty acid having 16-22 carbon atoms or a vegetable or animal oil containing such triglycerides and(c) at least one polar liquid selected from the group consisting of water, glycerol, ethylene glycol and propylene glycol. Such L2 phases are known per se but are novel in this context.The composition is prepared by forming the L2 phase and adding the biologically active material before, during or after the formation of the L2-phase. For sensitive substances such as proteins a mixture of the mono- and triglycerides is added dropwisely to a solution of said substance in the polar liquid.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: December 6, 1994
    Assignee: Drilletten AB
    Inventors: Sven Engstrom, Kare V. Larsson, Bjorn Lindman
  • Method of preparing controlled-release preparations for biologically active materials and resulting compositions
    Patent number: 5151272
    Abstract: A method and product for preparing a controlled-release composition are provided. The method comprises formation of a mixture containing at least one amphiphilic substance capable of forming a liquid crystalline phase, in contact with a liquid selected from the group consisting of water, glycerol, ethylene glycol, propylene glycol and mixtures thereof. The method includes a step of providing in such mixture a bioactive material. Preferred controlled-release compositions include an alkylbetaine zwitterionic surfactant therein.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: September 29, 1992
    Assignee: Fluid-Carbon International AB
    Inventors: Sven Engstrom, Bjorn Lindman, Kare Larsson