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Othmar Stelzer
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Wuppertal, DE
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last 30 patents
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Patent Grant
Phosphine ligands with amino acid groups, method for their producti...
Patent number
6,300,517
Issue date
Oct 9, 2001
Celanese GmbH
Othmar Stelzer
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Guanidinium phosphanes, their production and their use
Patent number
6,187,953
Issue date
Feb 13, 2001
Celanese GmbH
Othmar Stelzer
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for alkylating elemental phosphorus
Patent number
6,011,172
Issue date
Jan 4, 2000
Clariant GmbH
Norbert Weferling
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Secondary and tertiary phosphines and processes for their preparation
Patent number
5,925,785
Issue date
Jul 20, 1999
Celanese GmbH
Othmar Stelzer
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for the preparation of tertiary phosphines
Patent number
5,268,479
Issue date
Dec 7, 1993
Hoechst Aktiengesellschaft
Othmar Stelzer
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for the preparation of phosphanes
Patent number
5,003,108
Issue date
Mar 26, 1991
Hoechst Aktiengesellschaft
Othmar Stelzer
C07 - ORGANIC CHEMISTRY