Patents by Inventor Friedrich Strempfl

Friedrich Strempfl 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 for obtaining a polyhydroxyalkanoate from the cell material of a microogranism
    Patent number: 5213976
    Abstract: Process for extracting polyhydroxyalkanoates from the cell material of microorganisms by adding an organic solvent for the polyhydroxyalkanoate which is immiscible with water and which has a boiling point of below 100.degree. C., and, if appropriate, by adding water; stirring the resulting extraction mixture, if appropriate with refluxing; separating off the aqueous phase which contains the cell material in undissolved form from the organic phase; and injecting the organic phase into hot water, causing the dissolved polyhydroxyalkanoate to precipitate and the organic solvent to evaporate, and also isolating the precipitated polyhydroxyalkanoate flocs.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: May 25, 1993
    Assignee: PCD Polymere Gesellschaft m.b.H.
    Inventors: Wilfried Blauhut, Wolfgang Gierlinger, Friedrich Strempfl