Patents by Inventor Klaus Eichler

Klaus Eichler 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 isomerizing alkylthiophenes
    Patent number: 4783541
    Abstract: The invention relates to a process for isomerizing alkylthiophenes on zeolite catalysts. In particular, methylthiophene and ethylthiophene can be isomerized by this process. Suitable zeolites are in particular synthetic zeolites of the pentasil, mordenite of faujasite type in their acid form.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: November 8, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Klaus Eichler, Ernst I. Leupold
  • Process for the isomerization of o-, m- and/or p-toluidine
    Patent number: 4720583
    Abstract: The invention relates to a process for the isomerization of o-, m- or p-toluidine, or of a mixture of them, on a zirconium-containing zeolite catalyst of the pentasil type. Catalysts of this type are distinguished by particularly high activity and a long useful life. The invention particularly relates to the preparation of m-toluidine by isomerization of o- and/or p-toluidine on zirconium-containing zeolite catalysts of the pentasil type.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: January 19, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Klaus Eichler, Ernst I. Leupold, Hans-Jurgen Arpe, Herbert Baltes
  • Process for the isomerization of halogenated thiophenes
    Patent number: 4604470
    Abstract: The invention relates to a process for the isomerization of halogenated thiophenes on zeolite catalysts. In this manner, in particular, 2-chlorothiophene is isomerized to 3-chlorothiophene and 2-bromothiophene is isomerized to 3-bromothiophene. Particularly suitable zeolites are synthetic zeolites of the pentasil, mordenite or faujasite type in their acid form.
    Type: Grant
    Filed: May 23, 1985
    Date of Patent: August 5, 1986
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Klaus Eichler, Ernst I. Leupold