Inventor
YAMAMOTO KEISAKU
JP37 patents
⚠️ This page may combine multiple inventors who share the name “YAMAMOTO KEISAKU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SUMITOMO CHEMICAL CO
34 patentsUS5290878AMar 1, 1994
Butadiene copolymer and process for preparing same
SUMITOMO CHEMICAL CO86 citations96
US5128416AJul 7, 1992
Modified diene polymer rubbers
SUMITOMO CHEMICAL CO57 citations96
US6121401ASep 19, 2000
Propylene copolymer
SUMITOMO CHEMICAL CO25 citations92
US5548012AAug 20, 1996
Automotive weather strip
SUMITOMO CHEMICAL CO20 citations92
US5219938AJun 15, 1993
Modified diene polymer rubbers
SUMITOMO CHEMICAL CO37 citations92
US5082908AJan 21, 1992
Ethylene-α-olefin copolymer and process for producing the same
SUMITOMO CHEMICAL CO27 citations91
US4537936AAug 27, 1985
Diene rubber composition, method of preparing the same and tire employing said composition
SUMITOMO CHEMICAL CO19 citations82
US5462975AOct 31, 1995
Rubber compositions for sponge rubber
SUMITOMO CHEMICAL CO16 citations74
US4523618AJun 18, 1985
Branched polymer, process for the preparation thereof, tire tread rubber composition and tire
SUMITOMO CHEMICAL CO17 citations74
US4436873AMar 13, 1984
Conjugated diene block polymer and process for preparing the same
SUMITOMO CHEMICAL CO11 citations74
US4168358ASep 18, 1979
Method for producing olefin polymers
SUMITOMO CHEMICAL CO13 citations74
US5703151ADec 30, 1997
Rubber composition
SUMITOMO CHEMICAL CO17 citations73
US5100964AMar 31, 1992
Rubber composition
SUMITOMO CHEMICAL CO7 citations73
US5344881ASep 6, 1994
Rubber compositions and vulcanized rubber compositions
SUMITOMO CHEMICAL CO12 citations72
US5245007ASep 14, 1993
Method for purifying ethylene-α-olefin copolymer
SUMITOMO CHEMICAL CO9 citations72
US5093381AMar 3, 1992
Rubber for sponge and rubber composition for sponge
SUMITOMO CHEMICAL CO7 citations72
US5039756AAug 13, 1991
Vulcanizable epoxy group-containing elastomer composition
SUMITOMO CHEMICAL CO8 citations72
US3937763AFeb 10, 1976
Olefinic copolymer compositions
SUMITOMO CHEMICAL CO12 citations69
US5438101AAug 1, 1995
Rubber composition
SUMITOMO CHEMICAL CO4 citations63
US5292825AMar 8, 1994
Vulcanizable epoxy group-containing elastomer composition
SUMITOMO CHEMICAL CO3 citations63
US5189108AFeb 23, 1993
Modified polymer rubber and process for preparing the same
SUMITOMO CHEMICAL CO4 citations63
US6458901B1Oct 1, 2002
Propylenic copolymer and thermoplastic resin composition
SUMITOMO CHEMICAL CO5 citations62
US6087424AJul 11, 2000
Rubber composition
SUMITOMO CHEMICAL CO2 citations62
US5610226AMar 11, 1997
(Meth)acrylate copolymer and its elastomer compositions
SUMITOMO CHEMICAL CO2 citations62
US5122493AJun 16, 1992
Catalyst for olefinic hydrocarbon polymerization and process for producing olefinic hydrocarbon polymer
SUMITOMO CHEMICAL CO3 citations62
US5516862AMay 14, 1996
Process for producing ethylene-alpha-olefin copolymer rubber
SUMITOMO CHEMICAL CO2 citations61
US5459199AOct 17, 1995
Process for producing graft polymer
SUMITOMO CHEMICAL CO2 citations61
US4946888AAug 7, 1990
High-hardness rubber composition
SUMITOMO CHEMICAL CO3 citations59
US5250627AOct 5, 1993
Rubber composition
SUMITOMO CHEMICAL CO6 citations57
US3953410AApr 27, 1976
Process for producing amorphous olefin interpolymer
SUMITOMO CHEMICAL CO4 citations54
US5523353AJun 4, 1996
Rubber composition
SUMITOMO CHEMICAL CO1 citations52
US5274042ADec 28, 1993
Process for producing graft polymer
SUMITOMO CHEMICAL CO1 citations51
US5191041AMar 2, 1993
Catalyst for olefinic hydrocarbon polymerization and process and producing olefinic hydrocarbon polymer
SUMITOMO CHEMICAL CO1 citations51
US5288810AFeb 22, 1994
Vulcanized rubber composition and rubber vibration insulator
SUMITOMO CHEMICAL CO1 citations50