Patents by Inventor Heike Feldman

Heike Feldman 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).

  • Preparation of polyphenylene ethers in the presence of defoamer
    Patent number: 5237039
    Abstract: Polyphenylene ethers are prepared from monohydric phenols by oxidative coupling with oxygen-containing gases in the presence of an oxidation catalyst in an organic solvent by carrying out the polycondensation in the presence of a defoamer.
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: August 17, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Doris Zeltner, Peter Steieri, Heike Feldman, Klaus Muehlbach, Carola Hedtmann-Rein, Bernhard Czauderna, Karl Hennig