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Johannes Pfenninger
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Marly, CH
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last 30 patents
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Patent Grant
Process for preparing modified .beta.-quinacridone pigment
Patent number
5,229,515
Issue date
Jul 20, 1993
Ciba-Geigy Corporation
Johannes Pfenninger
C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information
Patent Grant
Process for the preparation of pyrrolo (3,4-c) pyrroles
Patent number
4,778,899
Issue date
Oct 18, 1988
Ciba-Geigy Corporation
Johannes Pfenninger
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Phenyl substituted pyrrolinones
Patent number
4,749,795
Issue date
Jun 7, 1988
Ciba-Geigy Corporation
Johannes Pfenninger
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Mixtures of pigments
Patent number
4,720,305
Issue date
Jan 19, 1988
Ciba-Geigy Corporation
Abul Iqbal
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Phenyl substituted aminodicarboxylate esters
Patent number
4,681,971
Issue date
Jul 21, 1987
Ciba-Geigy Corporation
Johannes Pfenninger
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for the preparation of pyrrolo[3,4-c]pyrroles, and novel py...
Patent number
4,659,775
Issue date
Apr 21, 1987
Ciba-Geigy Corporation
Johannes Pfenninger
C07 - ORGANIC CHEMISTRY