Klaus D. Steffen

Person

Hennef-Geisbach, DE

People

Patents Grantslast 30 patents

Information Patent Grant
Process for preparing n, n'-disubstituted p-quinonediimines, their...
- Patent number 6,147,239
- Issue date Nov 14, 2000
- Huels Aktiengesellschaft
- Guenther Bernhardt
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of methoxyacetic acid esters
- Patent number 6,143,920
- Issue date Nov 7, 2000
- Huels Aktiengesellschaft
- Wolfgang Kleemiss
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for preparing malonic acid and alkylmalonic acids
- Patent number 5,886,219
- Issue date Mar 23, 1999
- Huels Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of cyclopropane-1, 1-dicarboxylic acid...
- Patent number 5,869,737
- Issue date Feb 9, 1999
- Huels Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for preparing N,N'-disubstituted P-quinonediimines, their u...
- Patent number 5,856,542
- Issue date Jan 5, 1999
- Huels Aktiengesellschaft
- Guenther Bernhardt
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for preparing alkyl- and arylmalonic acids
- Patent number 5,849,949
- Issue date Dec 15, 1998
- Huels Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Dialkyl 2-haloethyl malonates
- Patent number 5,569,780
- Issue date Oct 29, 1996
- Huls Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Preparation of esters of cyclopropane-1,1-dicarboxylic acid
- Patent number 5,510,509
- Issue date Apr 23, 1996
- Huls Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for preparing n-alkyllactams
- Patent number 5,508,396
- Issue date Apr 16, 1996
- Huels Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for preparing dialkyl 2-haloethyl malonates
- Patent number 5,463,111
- Issue date Oct 31, 1995
- Huls Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of ketals
- Patent number 5,399,778
- Issue date Mar 21, 1995
- Huls Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of preparing substituted malonic ester anilides and malonic...
- Patent number 5,334,747
- Issue date Aug 2, 1994
- Huls Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of organosilanes containing methacryloy...
- Patent number 5,117,027
- Issue date May 26, 1992
- Huls Aktiengesellschaft
- Gunther Bernhardt
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of 3-carboxamido-5-vinyl-2-pyrrolidone
- Patent number 5,101,043
- Issue date Mar 31, 1992
- Huels Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of alkoxyalkylidenemalonic acid esters
- Patent number 5,041,619
- Issue date Aug 20, 1991
- Huels Aktiengesellschaft
- Franz-Albert von Itter
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of preparing 3,4-dihydro-alpha-pyrones
- Patent number 4,673,751
- Issue date Jun 16, 1987
- Dynamit Nobel AG
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of preparing terephthalic aldehyde and isophthalic aldehyde
- Patent number 4,465,865
- Issue date Aug 14, 1984
- Dynamit Nobel Aktiengesellschaft
- Fritz Englander
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of 3-chlorophthalide
- Patent number 4,446,327
- Issue date May 1, 1984
- Dynamit Nobel Aktiengesellschaft
- Greger Weisgerber
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of preparing quinolines, naphthyridines and other nitrogen b...
- Patent number 4,380,632
- Issue date Apr 19, 1983
- Dynamit Nobel Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of preparing oligomeric brominous xylylene bisphenol ethers
- Patent number 4,371,709
- Issue date Feb 1, 1983
- Dynamit Nobel AG
- Klaus-Dieter Steffen
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Polymeric azomethines
- Patent number 4,322,554
- Issue date Mar 30, 1982
- Dynamit Nobel Aktiengesellschaft
- Hans-Joachim Herrmann
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Aromatic bisazomethines, a method for their preparation, and their...
- Patent number 4,297,502
- Issue date Oct 27, 1981
- Dynamit Nobel Aktiengesellschaft
- Hans-Joachim Herrmann
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Method of preparing bis-(chloromethyl)-tetrachlorobenzenes
- Patent number 4,268,698
- Issue date May 19, 1981
- Dynamit Nobel Aktiengesellschaft
- Klaus D. Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of preparing phthalide
- Patent number 4,216,153
- Issue date Aug 5, 1980
- Dynamit Nobel Aktiengesellschaft
- Klaus D. Steffen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process of preparing 3-bromophthalide
- Patent number 4,211,710
- Issue date Jul 8, 1980
- Dynamit Nobel Aktiengesellschaft
- Klaus-Dieter Steffen
- C07 - ORGANIC CHEMISTRY

Klaus D. Steffen

Person

Patents Grantslast 30 patents

Process for preparing n, n'-disubstituted p-quinonediimines, their...

Process for the preparation of methoxyacetic acid esters

Process for preparing malonic acid and alkylmalonic acids

Process for the preparation of cyclopropane-1, 1-dicarboxylic acid...

Process for preparing N,N'-disubstituted P-quinonediimines, their u...

Process for preparing alkyl- and arylmalonic acids

Dialkyl 2-haloethyl malonates

Preparation of esters of cyclopropane-1,1-dicarboxylic acid

Process for preparing n-alkyllactams

Process for preparing dialkyl 2-haloethyl malonates

Process for the preparation of ketals

Method of preparing substituted malonic ester anilides and malonic...

Process for the preparation of organosilanes containing methacryloy...

Process for the preparation of 3-carboxamido-5-vinyl-2-pyrrolidone

Process for the preparation of alkoxyalkylidenemalonic acid esters

Method of preparing 3,4-dihydro-alpha-pyrones

Method of preparing terephthalic aldehyde and isophthalic aldehyde

Process for the preparation of 3-chlorophthalide

Method of preparing quinolines, naphthyridines and other nitrogen b...

Method of preparing oligomeric brominous xylylene bisphenol ethers

Polymeric azomethines

Aromatic bisazomethines, a method for their preparation, and their...

Method of preparing bis-(chloromethyl)-tetrachlorobenzenes

Method of preparing phthalide

Process of preparing 3-bromophthalide