Patents by Inventor Franz D. Klingler

Franz D. Klingler 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 preparing 1,2-5,6-diacetone-D-glucose
    Patent number: 5565037
    Abstract: The present invention relates to an improved process for preparing 1,2-5,6-diacetone-D-glucose from D-glucose and diketene or the adduct of diketene with acetone.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: October 15, 1996
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Rainer Sobotta, Franz D. Klingler
  • Process for preparing enantiomerically pure diarylprolinols
    Patent number: 5527923
    Abstract: The present invention relates to a new process for preparing enantiomerically pure diarylprolinols, especially (R)-(+)- or (S)-(-)-2-(diphenylhydroxymethyl)-pyrrolidine (R)-(+)- or (S)-(-)-.alpha.,.alpha.-diphenyl-(2-pyrrolidinyl)-methanol) starting from proline.
    Type: Grant
    Filed: May 4, 1995
    Date of Patent: June 18, 1996
    Assignee: Boehringer Ingelheim KG
    Inventors: Franz D. Klingler, Rainer Sobotta
  • Process for preparing (s)- and (r) -but-3-en-2-ol and the derivatives thereof from l-or d-lactic acid esters
    Patent number: 5457247
    Abstract: A novel process for preparing enantiomerically pure (S)- or (R)-but-3-en-2-ol compounds includes the following reaction steps:(a) reacting an alkyl ester of D- or L-lactic acid with a hydropyran compound to obtain a lactate ester having a hydropyranyl ether group,(b) reducing the lactate ester with an aluminum hydride at a temperature below 0.degree. C. to obtain a propionaldehyde having a hydropyranyl ether group,(c) reacting the propionaldehyde with an alkyl phosphonium salt to obtain a 3-butene having a hydropyranyl ether group, and(d) cleaving the hydropyranyl ether group to prepare the enantiomerically pure (S)- or (R)- but-3-en-2-ol.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: October 10, 1995
    Assignee: Boehringer Ingelheim KG
    Inventors: Franz D. Klingler, Manfred Psiorz
  • Process for preparing 1,2-5,6-diacetone-D-glucose
    Patent number: 5399201
    Abstract: The present invention relates to an improved process for preparing 1,2-5,6-diacetone-D-glucose from D-glucose and acetone.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: March 21, 1995
    Assignee: Boehringer Ingelheim KG
    Inventors: Franz D. Klingler, Albrecht Christmann
  • Continuous process for the preparation of resorable polyesters and the use thereof
    Patent number: 5378801
    Abstract: The invention relates to a continuous process for the preparation of resorbable polyesters.
    Type: Grant
    Filed: August 3, 1993
    Date of Patent: January 3, 1995
    Inventors: Dieter Reichert, Franz D. Klingler, Horst Schwall, Albert Christmann, Berthold Buchholz