Patents by Inventor Ulrich Grogp

Ulrich Grogp 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 the preparation of aromatic polyesters
    Patent number: 4841000
    Abstract: The preparation of aromatic polyesters based on diphenols and iso- and terephthalic acid is carried out by solventfree transesterification of esters of the diphenols with the aromatic dicarboxylic acids, the esters of the diphenols being initially reacted with teriphthalic acid alone and subsequently reacted with isophthalic acid after at least 80% of the terephthalic acid has undergone reaction.
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: June 20, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Tacke, Ulrich Grogp, Karsten-Josef Idel