Patents by Inventor Johan Hallborn

Johan Hallborn 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).

  • Production of ethanol from xylose
    Patent number: 6582944
    Abstract: This invention relates to recombinant-DNA-technology. Specifically this invention relates to new recombinant yeast strains transformed with xylose reductase and/or xylitol dehydrogenase enzyme genes. A yeast strain transformed with the xylose reductase gene is capable of reducing xylose to xylitol and consequently of producing xylitol in vivo. If both of these genes are transformed into a yeast strain, the resultant strain is capable of producing ethanol on xylose containing medium during fermentation. Further, the said new yeast strains are capable of expressing the said two enzymes. Xylose reductase produced by these strains can be used in an enzymatic process for the production of xylitol in vitro.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: June 24, 2003
    Assignee: Xyrofin Oy
    Inventors: Johan Hallborn, Merja Penttilä, Heikki Ojamo, Mats Walfridsson, Ulla Airaksinen, Sirkka Keränen, Bärbel Hahn-Hägerdal
  • Xylose utilization by recombinant yeasts
    Patent number: 5866382
    Abstract: This invention relates to recombinant-DNA-technology. Specifically, this invention relates to new recombinant yeast strains transformed with xylose reductase and/or xylitol dehydrogenase enzyme genes. A yeast strain transformed with the xylose reductase gene is capable of reducing xylose to xylitol and consequently of producing xylitol in vivo. If both of these genes are transformed into a yeast strain, the resultant strain is capable of producing ethanol on xylose containing medium during fermentation. Further, the said new yeast strains are capable of expressing the said two enzymes. Xylose reductase produced by these strains can be used in an enzymatic process for the production of xylitol in vitro.
    Type: Grant
    Filed: November 3, 1994
    Date of Patent: February 2, 1999
    Assignee: Xyrofin Oy
    Inventors: Johan Hallborn, Merja Penttila, Heikki Ojamo, Mats Walfridsson, Ulla Airaksinen, Sirkka Keranen, Barbel Hahn-Hagerdal