Wolfgang Rieper

Person

Frankfurt am Main, DE

People

Patents Grantslast 30 patents

Information Patent Grant
Crystal modification of C.I. Pigment Yellow 16
- Patent number 5,266,110
- Issue date Nov 30, 1993
- Hoechst Aktiengesellschaft
- Wolfgang Rieper
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Preparation of azo pigments with low PCB content by coupling in the...
- Patent number 5,243,032
- Issue date Sep 7, 1993
- Hoechst Aktiengesellschaft
- Wolfgang Rieper
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Preparation of a coupling product of bisiazotized 2,2',5,5'-tetrach...
- Patent number 5,194,597
- Issue date Mar 16, 1993
- Hoechst AG.
- Wolfgang Rieper
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Monoazo pigments derived from diazotized di- or trichloroanilines,...
- Patent number 5,086,168
- Issue date Feb 4, 1992
- Hoechst Aktiengesellschaft
- Wolfgang Rieper
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Addition compounds, a process for the preparation, and their use, b...
- Patent number 5,070,159
- Issue date Dec 3, 1991
- Hoechst Aktiengesellschaft
- Erwin Dietz
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Powdered azo pigments with improved rheological properties, process...
- Patent number 5,066,687
- Issue date Nov 19, 1991
- Hoechst Aktiengesellschaft
- Wolfgang Rieper
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for improving the application properties of disazo pigments
- Patent number 4,720,541
- Issue date Jan 19, 1988
- Hoechst Aktiengesellschaft
- Wolfgang Rieper
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Addition compounds and process for their preparation
- Patent number 4,631,330
- Issue date Dec 23, 1986
- Hoechst Aktiengesellschaft
- Erwin Dietz
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for improving the application properties of pigment yellow 13
- Patent number 4,589,921
- Issue date May 20, 1986
- Hoechst Aktiengesellschaft
- Klaus Hunger
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Azo pigment having improved hiding power and a process for its prep...
- Patent number 4,476,052
- Issue date Oct 9, 1984
- Farbwerke Hoechst Aktiengesellschaft
- Klaus Hunger
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Process for the manufacture of 3-amino-1-phenylpyrazol-5-one
- Patent number 4,410,707
- Issue date Oct 18, 1983
- Hoechst Aktiengesellschaft
- Wolfgang Tronich
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the purification of azo pigments by stirring an aqueous...
- Patent number 4,124,582
- Issue date Nov 7, 1978
- Hoechst Aktiengesellschaft
- Joachim Ribka
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...

Wolfgang Rieper

Person

Patents Grantslast 30 patents

Crystal modification of C.I. Pigment Yellow 16

Preparation of azo pigments with low PCB content by coupling in the...

Preparation of a coupling product of bisiazotized 2,2',5,5'-tetrach...

Monoazo pigments derived from diazotized di- or trichloroanilines,...

Addition compounds, a process for the preparation, and their use, b...

Powdered azo pigments with improved rheological properties, process...

Process for improving the application properties of disazo pigments

Addition compounds and process for their preparation

Process for improving the application properties of pigment yellow 13

Azo pigment having improved hiding power and a process for its prep...

Process for the manufacture of 3-amino-1-phenylpyrazol-5-one

Process for the purification of azo pigments by stirring an aqueous...