Patents by Inventor Herbert Gortz

Herbert Gortz 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 pure crotonic acids
    Patent number: 4918225
    Abstract: The invention relates to a process for the preparation of pure cis- or trans-crotonic acid from a mixture of the two isomers by melt crystallization. To prepare trans-crotonic acid, an isomer mixture I containing at least 40% by weight of trans-crotonic acid is used as the starting material. On the other hand, if cis-crotonic acid is to be prepared, an isomer mixture II containing at least 80% by weight of cis-crotonic acid is used as the starting material. The particular isomer mixture is melted and then left to cool, trans-crotonic acid being allowed to crystrallize out of mixture I to a residual content of at least 35% by weight, and cis-crotonic acid being allowed to crystallize out of mixture II to a residual content of at least 75% by weight.
    Type: Grant
    Filed: October 2, 1985
    Date of Patent: April 17, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Siegbert Rittner, Herbert Gortz, Knut Riedel