Patents by Inventor Klaus R. Muller

Klaus R. Muller 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).

  • Patent number: 5212321
    Abstract: A process for producing trimethylene carbonate wherein 1,3-propanediol is reacted with diethylcarbonate in the presence of zinc powder, zinc oxide, tin powder, tin halide or an organo-tin compound, at an elevated temperature.
    Type: Grant
    Filed: June 17, 1992
    Date of Patent: May 18, 1993
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Klaus R. Muller, Berthold Buchholz, Joachim Hess
  • Patent number: 5149833
    Abstract: An improved process for the preparation of D,L-Lactide which can be used directly in polymerization reactions.
    Type: Grant
    Filed: February 5, 1991
    Date of Patent: September 22, 1992
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Joachim Hess, Klaus R. Muller, Manfred Muller
  • Patent number: 5084553
    Abstract: The invention relates to new copolymers of lactic acid and tartaric acid, the preparation and use thereof.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: January 28, 1992
    Assignee: Boehringer Ingelheim KG
    Inventors: Joachim Hess, Klaus R. Muller
  • Patent number: 5011946
    Abstract: An improved process for the preparation of D,L-Lactide which can be used directly in polymerization reactions.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: April 30, 1991
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Joachim Hess, Klaus R. Muller, Manfred Muller
  • Patent number: 4945187
    Abstract: The invention relates to a process for preparing enantiomerically pure S(+)-propan-1,2-diol and R(-)-propan-1,2-diol from L(-)-lactide or D(+)-lactide, respectively.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: July 31, 1990
    Assignee: Karl Thomae GmbH
    Inventor: Klaus R. Muller