Inventor · disambiguated record
Ralf Pfirmann
Also filed as: PFIRMANN RALF
39 granted patents·1 pending application·271 citations·filing 1991–2003
97Inventor score
Top patents by PatentIndex Score
40 records- 0189US6001831AProcess for producing quinazoline derivativesCLARIANT GMBH·Filed 1996·Granted Dec 14, 1999·54 cites·19 claims
- 0286US6465643B1Aminophosphonium compoundsCLARIANT GMBH·Filed 2000·Granted Oct 15, 2002·15 cites·7 claims
- 0386US6103659ACatalyst comprising an amidophosphonium salt for halex reactionsAVENTIS RES & TECH GMBH & CO·Filed 1998·Granted Aug 15, 2000·34 cites·22 claims
- 0477US6645904B2Aminophosphonium compoundsCLARIANT GMBH·Filed 2002·Granted Nov 11, 2003·8 cites·3 claims
- 0571US5410082AProcess for preparing aminesFiled 1994·Granted Apr 25, 1995·10 cites·20 claims
- 0671US5227535AProcess for the preparation of 2-nitro-5-fluoro- or -5-chlorophenolHOECHST AG·Filed 1992·Granted Jul 13, 1993·11 cites·11 claims
- 0769US6407029B1Mixtures comprising tetrakis(pyrrolidino/piperdino)phosphonium saltsCLARIANT GMBH·Filed 2000·Granted Jun 18, 2002·6 cites·11 claims
- 0869US5849959ADerivatives of 2, 3, 6-trifluorophenols and a process for their preparationCLARIANT GMBH·Filed 1996·Granted Dec 15, 1998·10 cites·18 claims
- 0967US5384413AProcess for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydrideHOECHST AG·Filed 1993·Granted Jan 24, 1995·9 cites·25 claims
- 1065US5227545AProcess for the preparation of 2,4-dichlorofluorobenzeneHOECHST AG·Filed 1992·Granted Jul 13, 1993·9 cites·19 claims
- 1163US6075152AProcess for preparing isochroman-3-onesCLARIANT GMBH·Filed 1999·Granted Jun 13, 2000·9 cites·17 claims
- 1263US5478963A2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,6-difluorobenzonitrile-(2,3-difluoro-6-chlorobenzonitrile), process for their preparation and their use for the preparation of 2,3,6-trifluorobenzoic acidHOECHST AG·Filed 1994·Granted Dec 26, 1995·7 cites·25 claims
- 1362US5516932AHalogenated cinnamic acids and esters thereof, processes for the preparation thereof and halogenated aryldiazonium saltsHOECHST AG·Filed 1994·Granted May 14, 1996·7 cites·14 claims
- 1461US5965775AProcess for the preparation of 3,5-difluoroanilineCLARIANT GMBH·Filed 1998·Granted Oct 12, 1999·7 cites·22 claims
- 1560US5468863AProcess for the preparation of substituted 2,3-difluoropyridinesHOECHST AG·Filed 1993·Granted Nov 21, 1995·6 cites·21 claims
- 1658US6362365B1Preparation of trifluorobenzoic acidsCLARIANT GMBH·Filed 1999·Granted Mar 26, 2002·6 cites·14 claims
- 1756US5663410ACis-4-(2,2,3,3-tetrafluoropropoxy)-cinnamonitrile and trans-4-(2,2,3,3-tetrafluoropropoxy)-cinnamonitrile and a process for their preparationHOECHST AG·Filed 1995·Granted Sep 2, 1997·5 cites·5 claims
- 1856US5565612ASubstituted 2-chloro-3,4,5-trifluorobenzenes and a process for their preparationHOECHST AG·Filed 1995·Granted Oct 15, 1996·5 cites·1 claims
- 1955US6187952B1Two-step production of 3-chloro-4-fluoro-benzoyl chloride by chlorinationCLARIANT GMBH·Filed 1998·Granted Feb 13, 2001·5 cites·17 claims
- 2052US5274115AN'-substituted N-amino-3,4,5,6-tetrafluorophthalimidesHOECHST AG·Filed 1992·Granted Dec 28, 1993·3 cites·4 claims
- 2151US5874608AProcess for the preparation of esters of aromatic carboxylic acidHOECHST AG·Filed 1997·Granted Feb 23, 1999·4 cites·31 claims
- 2251US5481032AProcess for the preparation of halogenated benzoic acidsHOECHST AG·Filed 1993·Granted Jan 2, 1996·9 cites·16 claims
- 2348US2004029723A1Novel aminophosphonium compoundsCLARIANT GMBH·Filed 2003·Application pending·0 cites
- 2447US5744628AProcess for the preparation of esters of aromatic carboxylic acidsHOECHST AG·Filed 1996·Granted Apr 28, 1998·3 cites·30 claims
- 2546US5292967AProcess for producing 2,3-difluoro-6-nitrophenolHOECHST AG·Filed 1991·Granted Mar 8, 1994·3 cites·9 claims
- 2645US5446198A4-hydroxy-2,3,5-trifluorobenzoic acid and a process for its preparationHOECHST AG·Filed 1993·Granted Aug 29, 1995·2 cites·1 claims
- 2745US5430173AProcess for preparing alkyl 3-hydroxy-2, 4, 5-trifluorobenzoates and/or alkyl 3-alkoxy-2, 4, 5-trifluorobenzoatesHOECHST AG·Filed 1994·Granted Jul 4, 1995·2 cites·32 claims
- 2842US5723658AProcess for the preparation of salts of substituted or unsubstituted phthalic acidsHOECHST AG·Filed 1996·Granted Mar 3, 1998·2 cites·23 claims
- 2942US5179230AProcess for the preparation of 2,3,4,5-tetrafluorobenzoic acidHOECHST AG·Filed 1992·Granted Jan 12, 1993·2 cites·8 claims
- 3041US5739388AProcess for the preparation of aromatic compounds by decarboxylation of aromatic carboxylic acidsHOECHST AG·Filed 1996·Granted Apr 14, 1998·2 cites·32 claims
- 3139US6348603B1Process for the preparation of isochroman-3-onesCLARIANT GMBH·Filed 2000·Granted Feb 19, 2002·0 cites·16 claims
- 3239US5773651AProcess for the preparation of fluorine-containing chemical compoundsHOECHST AG·Filed 1996·Granted Jun 30, 1998·9 cites·15 claims
- 3338US5200556AProcess for the preparation of 3,4,6-trifluorophthalic acid and the anhydride thereofHOECHST AG·Filed 1992·Granted Apr 6, 1993·1 cites·8 claims
- 3437US5488152AProcess for the preparation of 4-alkoxy-3,5,6-trifluoro-phthalic acids and 3-alkoxy-2,4,5-trifluorobenzoic acidsHOECHST AG·Filed 1995·Granted Jan 30, 1996·1 cites·30 claims
- 3535US5304655AN'-substituted N-amino-3,4,5,6-tetrafluorophthalimides, and processes for their preparationHOECHST AG·Filed 1993·Granted Apr 19, 1994·0 cites·13 claims
- 3634US5525258ATrifluorophenylene compounds, process for their preparation, and their use in liquid-crystalline mixturesHOECHST AG·Filed 1995·Granted Jun 11, 1996·2 cites·8 claims
- 3734US5466859AProcess for preparing fluorobenzonitrilesHOECHST AG·Filed 1994·Granted Nov 14, 1995·3 cites·18 claims
- 3832US5973189AMonoesters of carboxymethylene anthranilic acids and process for preparing the sameCLARIANT GMBH·Filed 1996·Granted Oct 26, 1999·0 cites·4 claims
- 3931US5945556AProcess for preparing N-carboxymethylene-4-chloro-anthranilic acid and its dialkyl estersCLARIANT GMBH·Filed 1996·Granted Aug 31, 1999·0 cites·19 claims
- 4030US5473095AProcess for the preparation of chlorinated 4,5-difluorobenzoic acids, -benzoic acid derivatives and -benzaldehydesHOECHST AG·Filed 1994·Granted Dec 5, 1995·0 cites·15 claims
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