Patents by Inventor Heinrich J. Eilingsfeld

Heinrich J. Eilingsfeld 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).

  • Preparation of aromatic carbonyl or sulfonyl compounds with an aryl ether structure
    Patent number: 5256826
    Abstract: A process for the preparation of aromatic carbonyl or sulfonyl compounds with a diaryl ether structure by reacting phenols with halogenated carbonyl- or sulfonylaromatic compounds in a dipolar aprotic solvent is carried out in the presence of catalytic amounts of alkali metal nitrite or an aromatic nitro, nitroso, azo, azoxy or hydrazo compound.
    Type: Grant
    Filed: August 31, 1992
    Date of Patent: October 26, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Erwin Hahn, Heinrich J. Eilingsfeld, Helmut Reichelt, Alexander Aumueller, Bernd Hupfeld