Patents by Inventor Ulrich Griesel

Ulrich Griesel 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).

  • Yellow DIR coupler with 5-furyl(1,2,4-triazole) coupling off group
    Patent number: 4579816
    Abstract: Yellow DIR couplers corresponding to formula I below are capable of producing remarkably powerful inhibitory effects on remote layers while their action on the layer containing them is comparatively slight: ##STR1## In the above formula, R.sup.1 represents straight-chained or branched alkyl, optionally substituted aryl or --NR.sup.5 R.sup.6,R.sup.2, R.sup.5 represent H or alkyl with 1 or 2 carbon atoms,R.sup.3, R.sup.6 represent alkyl with 1 to 18 carbon atoms or optionally substituted aryl,R.sup.4 represents alkyl with 5 to 12 carbon atoms, andFu represents a substituted or unsubstituted furyl group.
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: April 1, 1986
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Hans Ohlschlager, Ulrich Griesel, Heinrich Odenwalder