Patents by Inventor Erich Illner

Erich Illner 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 thioether compounds
    Patent number: 4855441
    Abstract: 5-pyrazolone compounds which are substituted with a thioether group in the 4-position may be prepared by the reaction of a 5-pyrazolone compound which is unsubstituted in the 4-position with a sulphenic acid amide. The resulting 5-pyrazolone compounds substituted in the 4-position are suitable for use as 2-equivalent magenta couplers in color photographic recording materials.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: August 8, 1989
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Gunter Renner, Erich Illner