Patents by Inventor Detlef V. Hoerschelmann

Detlef V. Hoerschelmann 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 D(+)-naproxen
    Patent number: 4857462
    Abstract: A process for obtaining D-2-(6-methoxy-2-naphthyl)-propionic acid from a mixture of D- and L-2-(6-methoxy-2-naphthyl)-propionic acid lower alkyl esters is provided by asymmetric hydrolysis of the L-ester with a microbial enzyme, separation of the 2-(6-methoxy-2-naphthyl)-propionic acid from the D-2-(6-methoxy-2-naphthyl)-propionic acid lower alkyl ester and saponification of the latter, wherein the saponification is carried out enzymatically with esterase from hog liver or from Pleurotus ostreatus.
    Type: Grant
    Filed: October 27, 1986
    Date of Patent: August 15, 1989
    Assignee: Boehringer Mannheim GmbH
    Inventors: Josef Maier, Manfred Gloger, Detlef V. Hoerschelmann, Jan Strejcek, Sebastian Heimerl