Inventor · disambiguated record
Horst Langfeld
Also filed as: LANGFELD HORST
7 granted patents·33 citations·filing 1988–1995
81Inventor score
Files withCIBA GEIGY CORP7
Top patents by PatentIndex Score
7 records- 0155US4988804APolyazo dyes obtained by successive coupling of H-acid and two further anilinic diazo components on resorcinol or the likeCIBA GEIGY CORP·Filed 1988·Granted Jan 29, 1991·5 cites·4 claims
- 0253US5153140AProcess for controlling and optimising industrial processes for the preparation of dyes, fluorescent whitening agents and their intermediatesCIBA GEIGY CORP·Filed 1990·Granted Oct 6, 1992·19 cites·15 claims
- 0350US5196518AProcess for the preparation of metallizable azo dyes by carrying out the coupling in the presence of a buffer mixtureCIBA GEIGY CORP·Filed 1991·Granted Mar 23, 1993·4 cites·18 claims
- 0438US5026830AProcess for the preparation of azo dyes by carrying out coupling in the presence of an alkali metal chloride and ammonium chlorideCIBA GEIGY CORP·Filed 1988·Granted Jun 25, 1991·2 cites·15 claims
- 0534US5116955AProcess for the preparation of mono- and polyazo dyesCIBA GEIGY CORP·Filed 1990·Granted May 26, 1992·1 cites·16 claims
- 0632US4996302AProcess for the preparation of polyazo dyesCIBA GEIGY CORP·Filed 1988·Granted Feb 26, 1991·1 cites·14 claims
- 0725US5606034AProcess for the preparation of azo dyesCIBA GEIGY CORP·Filed 1995·Granted Feb 25, 1997·1 cites·13 claims
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