Patents by Inventor Alfons Lenhart

Alfons Lenhart 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 (R)-salbutamol
    Patent number: 7247750
    Abstract: Disclosed are processes for preparing levosalbutamol or the pharmacologically acceptable salts thereof on an industrial scale, using asymmetric hydrogenation as the key step and optionally a special sequence of subsequent steps, using rhodium as catalyst and a chiral bidentate phosphine ligand such as (2R, 4R)-4-(dicyclohexylphosphino)-2-(diphenyl-phosphino-methyl)-N-methyl-aminocarbonyl-pyrrolidine as catalyst system.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: July 24, 2007
    Assignee: Boehringer Ingelheim Pharma GmbH & Co. KG
    Inventors: Paul Kreye, Alfons Lenhart, Franz Dietrich Klingler
  • Process for preparing (R) salbutamol
    Publication number: 20060122431
    Abstract: Disclosed are processes for preparing levosalbutamol or the pharmacologically acceptable salts thereof on an industrial scale, using asymmetric hydrogenation as the key step and optionally a special sequence of subsequent steps, using rhodium as catalyst and a chiral bidentate phosphine ligand such as (2R, 4R)-4-(dicyclohexylphosphino)-2-(diphenyl-phosphino-methyl)-N-methyl-aminocarbonyl-pyrrolidine as catalyst system.
    Type: Application
    Filed: January 13, 2006
    Publication date: June 8, 2006
    Applicant: Boehringer Ingelheim Pharma GmbH & Co. KG
    Inventors: Paul Kreye, Alfons Lenhart, Franz Klingler
  • Process for preparing (R)-salbutamol
    Patent number: 7049469
    Abstract: The present invention relates to an improved process for preparing levosalbutamol or the pharmacologically acceptable salts thereof on an industrial scale, using asymmetric hydrogenation as the key step and optionally a special sequence of subsequent steps, using rhodium as catalyst and a chiral bidentate phosphine ligand such as (2R,4R)-4-(dicyclohexylphosphino)-2-(diphenyl-phosphino-methyl)-N-methyl-aminocarbonyl-pyrrolidine as catalyst system.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: May 23, 2006
    Assignee: Boehringer Ingelheim Pharma GmbH & Co. KG
    Inventors: Paul Kreye, Alfons Lenhart, Franz Dietrich Klingler
  • Process for preparing (R) salbutamol
    Publication number: 20050009926
    Abstract: The present invention relates to an improved process for preparing levosalbutamol or the pharmacologically acceptable salts thereof on an industrial scale, using asymmetric hydrogenation as the key step and optionally a special sequence of subsequent steps, using rhodium as catalyst and a chiral bidentate phosphine ligand such as (2R, 4R)-4-(dicyclohexylphosphino)-2-(diphenyl-phosphino-methyl)-N-methyl-aminocarbonyl-pyrrolidine as catalyst system.
    Type: Application
    Filed: October 23, 2003
    Publication date: January 13, 2005
    Applicant: Boehringer Ingelheim Pharma GmbH & Co. KG
    Inventors: Paul Kreye, Alfons Lenhart, Franz Klingler