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Winfried Seidel
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Obertshausen, DE
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last 30 patents
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Patent Grant
Substituted 2,6-diaminotoluenes, processes for their preparation an...
Patent number
5,230,710
Issue date
Jul 27, 1993
Hans Schwarzkopf GmbH
Mustafa Akram
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Grant
Nitro-p-phenylenediamine derivatives, processes for their preparati...
Patent number
5,163,970
Issue date
Nov 17, 1992
Hans Schwarzkopf GmbH
Mustafa Akram
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Grant
Process for the selective preparation of N-substituted 1,4-diamino-...
Patent number
5,091,581
Issue date
Feb 25, 1992
Hans Schwarzkopf GmbH
Winfried Seidel
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Grant
Nitro-p-phenylenediamine derivatives, processes for their preparati...
Patent number
5,067,967
Issue date
Nov 26, 1991
501 Hans Schwarzkopf GmbH
Mustafa Akram
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Grant
2,4-Diaminophenyl tetrahydrofurfuryl ethers, processes for their pr...
Patent number
4,857,070
Issue date
Aug 15, 1989
Winfried Seidel
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Grant
Substituted 4-amino-3-nitrophenols, processes for their preparation...
Patent number
4,575,378
Issue date
Mar 11, 1986
Hans Schwarzkopf GmbH
Winfried Seidel
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE