Patents by Inventor Bernhard Wehrle

Bernhard Wehrle 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).

  • Bisphenol synthesis on modified ion-exchange resins using specially purified carbonyl compounds
    Patent number: 5780690
    Abstract: The invention relates to a process for the synthesis of bis-(4-hydroxyphenyl)-alkanes on ion-exchange resins or mixtures of ion-exchange resins which are modified with alkyl-SH groups, wherein the monophenols and carbonyl compounds to be used have first been purified to remove substances which can transfer alkyl groups.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: July 14, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Berg, Gerhard Fennhoff, Ralf Pakull, Hans-Josef Buysch, Bernhard Wehrle, Alfred Eitel, Claus Wulff, Jurgen Kirsch
  • Process for the production of bisphenols
    Patent number: 5302774
    Abstract: The invention relates to a process for the production of bisphenols from acetone and phenols in the presence of sulfonic acid ion exchanger resins modified with alkyl-SH groups, in which 0.6 to 5% by weight H.sub.2 O is added to the mixture of phenol and acetone before the reaction.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: April 12, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Berg, Hans-Josef Buysch, Alfred Eitel, Gerhard Fennhoff, Otto Immel, Ralf Pakull, Bernhard Wehrle, Claus Wulff