Inventor · disambiguated record
Keisaku Yamamoto
Also filed as: YAMAMOTO KEISAKU
37 granted patents·535 citations·filing 1974–1998
98Inventor score
Top patents by PatentIndex Score
37 records- 0193US5290878AButadiene copolymer and process for preparing sameSUMITOMO CHEMICAL CO·Filed 1993·Granted Mar 1, 1994·86 cites·23 claims
- 0289US5128416AModified diene polymer rubbersSUMITOMO CHEMICAL CO·Filed 1990·Granted Jul 7, 1992·57 cites·6 claims
- 0389US4471093AElastomer composition comprising a blend of SBR rubbersSUMIMOTO RUBBER IND LTD·Filed 1983·Granted Sep 11, 1984·57 cites·6 claims
- 0482US5219938AModified diene polymer rubbersSUMITOMO CHEMICAL CO·Filed 1992·Granted Jun 15, 1993·37 cites·6 claims
- 0577US5548012AAutomotive weather stripSUMITOMO CHEMICAL CO·Filed 1994·Granted Aug 20, 1996·20 cites·14 claims
- 0677US5082908AEthylene-α-olefin copolymer and process for producing the sameSUMITOMO CHEMICAL CO·Filed 1989·Granted Jan 21, 1992·27 cites·5 claims
- 0771US4385151AComposition containing isoprene polymerSUMITOMO RUBBER IND·Filed 1981·Granted May 24, 1983·20 cites·1 claims
- 0870US6121401APropylene copolymerSUMITOMO CHEMICAL CO·Filed 1998·Granted Sep 19, 2000·25 cites·13 claims
- 0970US4537936ADiene rubber composition, method of preparing the same and tire employing said compositionSUMITOMO CHEMICAL CO·Filed 1982·Granted Aug 27, 1985·19 cites·5 claims
- 1068US4168358AMethod for producing olefin polymersSUMITOMO CHEMICAL CO·Filed 1977·Granted Sep 18, 1979·13 cites·25 claims
- 1166US4523618ABranched polymer, process for the preparation thereof, tire tread rubber composition and tireSUMITOMO CHEMICAL CO·Filed 1983·Granted Jun 18, 1985·17 cites·8 claims
- 1262US3937763AOlefinic copolymer compositionsSUMITOMO CHEMICAL CO·Filed 1975·Granted Feb 10, 1976·12 cites·24 claims
- 1361US5462975ARubber compositions for sponge rubberSUMITOMO CHEMICAL CO·Filed 1994·Granted Oct 31, 1995·16 cites·16 claims
- 1460US4436873AConjugated diene block polymer and process for preparing the sameSUMITOMO CHEMICAL CO·Filed 1983·Granted Mar 13, 1984·11 cites·4 claims
- 1558US5703151ARubber compositionSUMITOMO CHEMICAL CO·Filed 1996·Granted Dec 30, 1997·17 cites·9 claims
- 1656US5430086ARubber composition for tire treadsSUMITOMO RUBBER IND·Filed 1993·Granted Jul 4, 1995·14 cites·6 claims
- 1752US5344881ARubber compositions and vulcanized rubber compositionsSUMITOMO CHEMICAL CO·Filed 1993·Granted Sep 6, 1994·12 cites·21 claims
- 1852US5245007AMethod for purifying ethylene-α-olefin copolymerSUMITOMO CHEMICAL CO·Filed 1991·Granted Sep 14, 1993·9 cites·14 claims
- 1950US5039756AVulcanizable epoxy group-containing elastomer compositionSUMITOMO CHEMICAL CO·Filed 1989·Granted Aug 13, 1991·8 cites·5 claims
- 2044US5100964ARubber compositionSUMITOMO CHEMICAL CO·Filed 1991·Granted Mar 31, 1992·7 cites·6 claims
- 2143US5438101ARubber compositionSUMITOMO CHEMICAL CO·Filed 1993·Granted Aug 1, 1995·4 cites·16 claims
- 2243US5093381ARubber for sponge and rubber composition for spongeSUMITOMO CHEMICAL CO·Filed 1990·Granted Mar 3, 1992·7 cites·12 claims
- 2340US5189108AModified polymer rubber and process for preparing the sameSUMITOMO CHEMICAL CO·Filed 1990·Granted Feb 23, 1993·4 cites·13 claims
- 2437US6458901B1Propylenic copolymer and thermoplastic resin compositionSUMITOMO CHEMICAL CO·Filed 1998·Granted Oct 1, 2002·5 cites·22 claims
- 2537US5459199AProcess for producing graft polymerSUMITOMO CHEMICAL CO·Filed 1993·Granted Oct 17, 1995·2 cites·5 claims
- 2637US5292825AVulcanizable epoxy group-containing elastomer compositionSUMITOMO CHEMICAL CO·Filed 1990·Granted Mar 8, 1994·3 cites·6 claims
- 2736US5250627ARubber compositionSUMITOMO CHEMICAL CO·Filed 1992·Granted Oct 5, 1993·6 cites·16 claims
- 2836US5122493ACatalyst for olefinic hydrocarbon polymerization and process for producing olefinic hydrocarbon polymerSUMITOMO CHEMICAL CO·Filed 1991·Granted Jun 16, 1992·3 cites·11 claims
- 2935US3953410AProcess for producing amorphous olefin interpolymerSUMITOMO CHEMICAL CO·Filed 1974·Granted Apr 27, 1976·4 cites·31 claims
- 3034US5523353ARubber compositionSUMITOMO CHEMICAL CO·Filed 1994·Granted Jun 4, 1996·1 cites·34 claims
- 3134US5516862AProcess for producing ethylene-alpha-olefin copolymer rubberSUMITOMO CHEMICAL CO·Filed 1994·Granted May 14, 1996·2 cites·18 claims
- 3233US5274042AProcess for producing graft polymerSUMITOMO CHEMICAL CO·Filed 1992·Granted Dec 28, 1993·1 cites·3 claims
- 3333US4946888AHigh-hardness rubber compositionSUMITOMO CHEMICAL CO·Filed 1989·Granted Aug 7, 1990·3 cites·5 claims
- 3432US5610226A(Meth)acrylate copolymer and its elastomer compositionsSUMITOMO CHEMICAL CO·Filed 1995·Granted Mar 11, 1997·2 cites·15 claims
- 3531US6087424ARubber compositionSUMITOMO CHEMICAL CO·Filed 1996·Granted Jul 11, 2000·2 cites·10 claims
- 3631US5191041ACatalyst for olefinic hydrocarbon polymerization and process and producing olefinic hydrocarbon polymerSUMITOMO CHEMICAL CO·Filed 1992·Granted Mar 2, 1993·1 cites·4 claims
- 3730US5288810AVulcanized rubber composition and rubber vibration insulatorSUMITOMO CHEMICAL CO·Filed 1992·Granted Feb 22, 1994·1 cites·11 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →