Patents by Inventor Marten Wiersma

Marten Wiersma 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).

  • Microbial 11.alpha.-hydroxylation of steroids
    Patent number: 6046023
    Abstract: The invention relates to a microbial method of in vitro transformation of a steroid into its corresponding 11.alpha.-hydroxy analogue using oxygen and a microorganism selected from the Aspergillus ochraceus, Aspergillus niger, Rhizopus stolonifer, Rhizopus nigricans, Rhizopus arrhizus, and strains of Pestelotia, using as substrate a steroid having a purity of less than 97% and more than 90% at a concentration greater than 10 g/l.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: April 4, 2000
    Assignee: Akzo Nobel, N.V.
    Inventors: Marten Wiersma, Peter van der Meijden