Inventor · disambiguated record
Gerd Leston
Also filed as: LESTON GERD
23 granted patents·135 citations·filing 1973–1984
95Inventor score
Technology areasC07C
Files withKOPPERS CO INC23
Top patents by PatentIndex Score
23 records- 0186US4475001AProcess for alkylating phenolic compounds to produce ortho- or para-monoalkylated phenols or 2,4- or 2,6-dialkylated phenolsKOPPERS CO INC·Filed 1983·Granted Oct 2, 1984·22 cites·27 claims
- 0285US3992455APreparation of 5-sec-alkyl-m-cresolKOPPERS CO INC·Filed 1973·Granted Nov 16, 1976·15 cites·31 claims
- 0383US4267391AProcess for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols characterized by urea clathration of metal-cresolKOPPERS CO INC·Filed 1979·Granted May 12, 1981·16 cites·25 claims
- 0478US4267389AProcess for separating para-cresol from a mixture of methylated and ethylated phenolsKOPPERS CO INC·Filed 1979·Granted May 12, 1981·11 cites·18 claims
- 0578US4267390AProcess for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols characterized by selective complexation with calcium bromide and sodium acetateKOPPERS CO INC·Filed 1979·Granted May 12, 1981·12 cites·29 claims
- 0677US4267392AProcess for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols containing meta-para-cresolKOPPERS CO INC·Filed 1979·Granted May 12, 1981·11 cites·15 claims
- 0770US4009212AMethod for the preparation of meta dihydroxybenzenesKOPPERS CO INC·Filed 1975·Granted Feb 22, 1977·8 cites·5 claims
- 0867US4480140AProcess for alkylating phenolic compounds to produce ortho or para-monoalkylated or 2,4- or 2,6-dialkylated phenolsKOPPERS CO INC·Filed 1983·Granted Oct 30, 1984·8 cites·38 claims
- 0961US4424381AProcess for separating dihydric phenolsKOPPERS CO INC·Filed 1982·Granted Jan 3, 1984·6 cites·37 claims
- 1057US4447658AProcess for separating 3,5-xylenol or 3,4-xylenol from other polymethylated phenolic compoundsKOPPERS CO INC·Filed 1982·Granted May 8, 1984·5 cites·12 claims
- 1157US4423253AProcess for separating t-butylated phenolsKOPPERS CO INC·Filed 1982·Granted Dec 27, 1983·5 cites·24 claims
- 1250US4394526APara-cresol halide salt complex useful for separating para-cresol from meta-cresolKOPPERS CO INC·Filed 1980·Granted Jul 19, 1983·3 cites·5 claims
- 1349US4429169AProcess for separating isopropylated m-cresolsKOPPERS CO INC·Filed 1982·Granted Jan 31, 1984·3 cites·6 claims
- 1448US4431846AReduction of o-ethylphenol in m,p-cresol by preferential t-butylationKOPPERS CO INC·Filed 1982·Granted Feb 14, 1984·3 cites·13 claims
- 1544US4447654AProcess for separating nitrated phenolic compounds from other phenolic compoundsKOPPERS CO INC·Filed 1982·Granted May 8, 1984·2 cites·24 claims
- 1644US4429168AProcess for separating chlorinated phenolsKOPPERS CO INC·Filed 1982·Granted Jan 31, 1984·2 cites·24 claims
- 1741US4499312AComplex formed to separate 3,5-xylenol or 3,4-xylenol from other polymethylated phenolic compoundsKOPPERS CO INC·Filed 1984·Granted Feb 12, 1985·1 cites·2 claims
- 1841US4469901AComplex formed for separating isopropylated m-cresolsKOPPERS CO INC·Filed 1984·Granted Sep 4, 1984·1 cites·1 claims
- 1938US4046818APurification of 3,5-dialkylphenolsKOPPERS CO INC·Filed 1975·Granted Sep 6, 1977·1 cites·9 claims
- 2035US4496774AComplex formed to separate nitrated phenolic compounds from other phenolic compoundsKOPPERS CO INC·Filed 1984·Granted Jan 29, 1985·0 cites·1 claims
- 2135US4479019AComplex formed to separate nitrated phenolic compounds from other phenolic compoundsKOPPERS CO INC·Filed 1984·Granted Oct 23, 1984·0 cites·2 claims
- 2235US4469900AComplex formed for separating chlorinated phenolsKOPPERS CO INC·Filed 1984·Granted Sep 4, 1984·0 cites·6 claims
- 2331US4158101AProcess for the methylation of phenolic compoundsKOPPERS CO INC·Filed 1977·Granted Jun 12, 1979·0 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →