Patents by Inventor Karl G. Seifert

Karl G. Seifert 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 4-phenoxy-phenols
    Patent number: 4316993
    Abstract: Diazotization of 4-phenoxy-anilines in aqueous sulfuric acid of 60 to 75% strength and decomposition of the resulting diazonium compound in sulfuric acid of the same concentration range yields the corresponding phenols in high yields and quality. These phenols are intermediate for the corresponding 4-phenoxy-phenoxy alkane carboxylic acids which are pharmaceuticals capable of reducing the blood serum lipid level.
    Type: Grant
    Filed: February 28, 1980
    Date of Patent: February 23, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Emmerich Paszthory, Karl G. Seifert, Vincenz Zimmermann, Hans J. Nestler