Inventor · disambiguated record
Keizaburo Yamaguchi
Also filed as: YAMAGUCHI KEIZABURO
57 granted patents·323 citations·filing 1979–1997
98Inventor score
Top patents by PatentIndex Score
57 records- 0185US4453009AProcess for producing fluorobenzophenone derivativesMITSUI TOATSU CHEMICALS·Filed 1982·Granted Jun 5, 1984·19 cites·5 claims
- 0283US4287366AProcess for preparing bisphenol sulfone derivativesMITSUI TOATSU CHEMICALS·Filed 1980·Granted Sep 1, 1981·18 cites·13 claims
- 0381US5470943APolyimideMITSUI TOATSU CHEMICALS·Filed 1994·Granted Nov 28, 1995·27 cites·18 claims
- 0476US6040111AAromatic hydroxycarboxylic acid resins and their useMITSUI CHEMICALS INC·Filed 1997·Granted Mar 21, 2000·23 cites·4 claims
- 0574US5631377APolyimide intermediatesMITSUI TOATSU CHEMICALS·Filed 1995·Granted May 20, 1997·12 cites·3 claims
- 0673US5023366ASalicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal salts of the copolymers, and color-developing sheets employing the agentsMITSUI TOATSU CHEMICALS·Filed 1987·Granted Jun 11, 1991·20 cites·28 claims
- 0772US5231160AAromatic diamine compound, preparation process of same and polyimide prepared from sameMITSUI TOATSU CHEMICALS·Filed 1991·Granted Jul 27, 1993·10 cites·24 claims
- 0871US5077436ABis(3-aminophenoxy) aromatics and method of preparing the sameMITSUI TOATSU CHEMICALS·Filed 1986·Granted Dec 31, 1991·10 cites·15 claims
- 0969US5480965AReadily soluble, amorphous polyimide, and preparation process of sameMITSUI TOATSU CHEMICALS·Filed 1994·Granted Jan 2, 1996·14 cites·32 claims
- 1067US4275240AProcess for the preparation of 2,2'-bisphenol sulfoxidesMITSUI TOATSU CHEMICALS·Filed 1980·Granted Jun 23, 1981·8 cites·9 claims
- 1166US4966961APolymaleimide from polyarylene polyamine and process for the preparation thereofMITSUI TOATSU CHEMICALS·Filed 1989·Granted Oct 30, 1990·6 cites·17 claims
- 1265US4952648AProduction process of multivalent metal-modified salicylic acid/styrene resin, color-developing agent using the resin and suited for use in pressure-sensitive copying paper sheet and pressure-sensitive copying paper unit employing the agentMITSUI TOATSU CHEMICALS·Filed 1988·Granted Aug 28, 1990·11 cites·7 claims
- 1362US5326739AProcess for producing 3,5-di(α-methylbenzyl)salicylic acid derivative, and use of polyvalent-metal-modified product thereof as color developerMITSUI TOATSU CHEMICALS·Filed 1993·Granted Jul 5, 1994·7 cites·15 claims
- 1460US5484948ABismaleimide compoundsMITSUI TOATSU CHEMICALS·Filed 1994·Granted Jan 16, 1996·4 cites·4 claims
- 1560US5206438AAromatic diamine compounds, bismaleimide compounds, thermosetting resin forming compositions therefrom, resins therefrom, and methods for their preparationMITSUI TOATSU CHEMICALS·Filed 1990·Granted Apr 27, 1993·4 cites·1 claims
- 1659US4692554AProcess for producing 1,3-bis(3-aminophenoxy)benzeneMITSUI TOATSU CHEMICALS·Filed 1984·Granted Sep 8, 1987·5 cites·6 claims
- 1758US5260388APolyimide and process for the preparation thereofMITSUI TOATSU CHEMICALS·Filed 1992·Granted Nov 9, 1993·9 cites·21 claims
- 1858US4987261ADiaminoindane derivativesMITSUI TOATSU CHEMICALS·Filed 1989·Granted Jan 22, 1991·5 cites·7 claims
- 1955US5447901AColor-developing compositions and their useMITSUI TOATSU CHEMICALS·Filed 1994·Granted Sep 5, 1995·6 cites·7 claims
- 2055US4312522AHeat sensitive recording sheetMITSUI TOATSU CHEMICALS·Filed 1980·Granted Jan 26, 1982·7 cites·7 claims
- 2154US4997874AAqueous suspension and preparation method thereofMITSUI TOATSU CHEMICALS·Filed 1988·Granted Mar 5, 1991·7 cites·11 claims
- 2254US4701567AProcess for producing 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindaneMITSUI TOATSU CHEMICALS·Filed 1986·Granted Oct 20, 1987·4 cites·7 claims
- 2354US4260179AColor-developing sheet for pressure-sensitive recording sheetsMITSUI TOATSU CHEMICALS·Filed 1979·Granted Apr 7, 1981·12 cites·11 claims
- 2453US4803258AThermoplastic aromatic polyether-pyridine and process for preparing sameMITSUI TOATSU CHEMICALS·Filed 1987·Granted Feb 7, 1989·3 cites·5 claims
- 2552US4482742AProcess for preparing of 3,3'-diamino diphenylsulfonesMITSUI TOATSU CHEMICALS·Filed 1983·Granted Nov 13, 1984·3 cites·6 claims
- 2650US4937318AAromatic amine resinsMITSUI TOATSU CHEMICALS·Filed 1988·Granted Jun 26, 1990·2 cites·7 claims
- 2748US5376615AColor-developing compositions and their useMITSUI TOATSU CHEMICALS·Filed 1992·Granted Dec 27, 1994·4 cites·9 claims
- 2847US4671890AAminobenzylamine compositionMITSUI TOATSU CHEMICALS·Filed 1985·Granted Jun 9, 1987·6 cites·2 claims
- 2946US5079331AHeat-resistant epoxy resin composition based on 2-(4-hydroxyphenyl)-2-(4-maleimidophenyl)propaneMITSUI TOATSU CHEMICALS·Filed 1990·Granted Jan 7, 1992·6 cites·12 claims
- 3046US4783521ALinear salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal-resins of the copolymersMITSUI TOATSU CHEMICALS·Filed 1987·Granted Nov 8, 1988·6 cites·22 claims
- 3145US5674953AMethod of preventing scale adhesion to surfaces of polymerization tank with phenol-aldehyde coatingMITSUI TOATSU CHEMICALS·Filed 1995·Granted Oct 7, 1997·5 cites·2 claims
- 3244US5051494AThermosetting resin composition comprising an aromatic amineMITSUI TOATSU CHEMICALS·Filed 1990·Granted Sep 24, 1991·2 cites·7 claims
- 3344US4754068A1,3-bis(3-aminophenoxy)-5-halogenobenzenes and process for their preparationMITSUI TOATSU CHEMICALS·Filed 1986·Granted Jun 28, 1988·2 cites·16 claims
- 3444US4380671AProcess for the preparation of 2,2'-bis(4-substituted phenol)sulfidesMITSUI TOATSU CHEMICALS·Filed 1981·Granted Apr 19, 1983·2 cites·14 claims
- 3542US5494996APolyimide resin compositionMITSUI TOATSU CHEMICALS·Filed 1994·Granted Feb 27, 1996·4 cites·18 claims
- 3642US4618714AProcess for preparation of 3,3'- or 3,4'-diaminobenzophenonesMITSUI TOATSU CHEMICALS·Filed 1983·Granted Oct 21, 1986·1 cites·5 claims
- 3741US5028581AOdorless multi-valent metal modified products of salicyclic acid copolymers, production processes thereof, and use thereof as color-developing agents for pressure-sensitive copying paper sheetsMITSUI TOATSU CHEMICALS·Filed 1989·Granted Jul 2, 1991·3 cites·6 claims
- 3839US5147948AMethod for polymerizing vinyl chloride while inhibiting adhesion to the polymerization reactor with coating from poly(hydricphenol sulfide)MITSUI TOATSU CHEMICALS·Filed 1990·Granted Sep 15, 1992·4 cites·10 claims
- 3938US4407892AHeat sensitive recording sheetMITSUI TOATSU CHEMICALS·Filed 1982·Granted Oct 4, 1983·5 cites·6 claims
- 4037US5484880APolyimideMITSUI TOATSU CHEMICALS·Filed 1994·Granted Jan 16, 1996·4 cites·16 claims
- 4135US5798422AAromatic hydroxycarboxylic acid resins and their useMITSUI TOATSU CHEMICALS·Filed 1995·Granted Aug 25, 1998·3 cites·11 claims
- 4235US5260403AColor-developing composition, aqueous suspension of the composition, and color-developing sheet produced using the suspension and suitable for use in pressure-sensitive copying paperMITSUI TOATSU CHEMICALS·Filed 1992·Granted Nov 9, 1993·4 cites·15 claims
- 4335US4540818AProcess for preparation of 3,3'- or 3,4'-diaminodiphenylmethaneMITSUI TOATSU CHEMICALS·Filed 1983·Granted Sep 10, 1985·0 cites·9 claims
- 4434US5364967AAromatic diamine compounds, bismalemide compounds, thermosetting resin forming compositions therefrom, resin therefrom, and methods for their preparationMITSUI TOATSU CHEMICALS·Filed 1993·Granted Nov 15, 1994·0 cites·5 claims
- 4534US5274150AProcess for producing 3,5-di(α-methylbenzyl)salicyclic acid derivative, and use of polyvalent-metal-modified product thereof as color developerMITSUI TOATSU CHEMICALS·Filed 1991·Granted Dec 28, 1993·1 cites·15 claims
- 4633US5106953AAromatic amine resins, processes for producing the same and a thermosetting resin composition containing the sameMITSUI TOATSU CHEMICALS·Filed 1990·Granted Apr 21, 1992·0 cites·12 claims
- 4733US5013848AAromatic bismaleimide derivatives and process for preparing sameMITSUI TOATSU CHEMICALS·Filed 1986·Granted May 7, 1991·0 cites·1 claims
- 4833US4957994AEpoxy resins containing imido rings, production process thereof and epoxy resin compositions containing the sameMITSUI TOATSU CHEMICALS·Filed 1989·Granted Sep 18, 1990·1 cites·15 claims
- 4932US6291600B1Method of preventing scale adhesion to the surfaces of a polymerization tankMITSUI CHEMICALS INC·Filed 1993·Granted Sep 18, 2001·1 cites·15 claims
- 5032US5145949AProduction process for making aromatic amine resinsMITSUI TOATSU CHEMICALS·Filed 1992·Granted Sep 8, 1992·0 cites·11 claims
Showing the top 50 of 57 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →