Patents by Inventor Frank Bienewald

Frank Bienewald 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).

  • Homogeneous asymmetric hydrogenation using phosphine ligands of transition metals
    Patent number: 6207853
    Abstract: A process for the preparation of an enantiomerically enriched 2-substituted succinic acid derivative of formula 2, which comprises asymmetric hydrogenation of the dehydro precursor of formula 7 or 8, or a mixture thereof wherein R1 and R2 are independently H, a salt-forming cation, or an organic group of up to 30 C atoms, and R3 and R4 are independently H or an organic group of up to 30 C atoms, provided that R3 and R4 are not both H, in the presence of a transition metal complex of a chiral phosphine ligand having the partial formula 10 wherein n is 0 to 6 and R represents at least one non-hydrogen organic group of up to 30 C atoms.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: March 27, 2001
    Assignee: Chirotech Technology, Inc.
    Inventors: Mark Joseph Burk, Frank Bienewald, Martin Edward Fox, Antonio Zanotti-Gerosa