Inventor · disambiguated record
John A. Ewen
Also filed as: EWEN JOHN · EWEN JOHN A · RAZAVI ABBAS
52 granted patents·6,741 citations·filing 1983–2007
99Inventor score
Files withFINA TECHNOLOGY30BASELL POLYOLEFINE GMBH5EXXON RESEARCH ENGINEERING CO4MONTELL TECHNOLOGY COMPANY BV4EXXON CHEMICAL PATENTS INC3
Top patents by PatentIndex Score
52 records- 0199US5324800AProcess and catalyst for polyolefin density and molecular weight controlEXXON CHEMICAL PATENTS INC·Filed 1991·Granted Jun 28, 1994·993 cites·33 claims
- 0299US4937299AProcess and catalyst for producing reactor blend polyolefinsEXXON RESEARCH ENGINEERING CO·Filed 1985·Granted Jun 26, 1990·798 cites·17 claims
- 0399US4892851AProcess and catalyst for producing syndiotactic polyolefinsFINA TECHNOLOGY·Filed 1988·Granted Jan 9, 1990·457 cites·12 claims
- 0499US4794096AHafnium metallocene catalyst for the polymerization of olefinsFINA TECHNOLOGY·Filed 1987·Granted Dec 27, 1988·706 cites·8 claims
- 0599US4530914AProcess and catalyst for producing polyethylene having a broad molecular weight distributionEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Jul 23, 1985·499 cites·7 claims
- 0698US6635779B1Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefinsBASELL TECHNOLOGY CO BV·Filed 2000·Granted Oct 21, 2003·103 cites·38 claims
- 0798US5387568APreparation of metallocene catalysts for polymerization of olefinsFINA TECHNOLOGY·Filed 1992·Granted Feb 7, 1995·297 cites·18 claims
- 0898US5036034ACatalyst for producing hemiisotactic polypropyleneFINA TECHNOLOGY·Filed 1989·Granted Jul 30, 1991·167 cites·8 claims
- 0998US4935474AProcess and catalyst for producing polyethylene having a broad molecular weight distributionEXXON RESEARCH ENGINEERING CO·Filed 1985·Granted Jun 19, 1990·266 cites·7 claims
- 1098US4522982AIsotactic-stereoblock polymers of alpha-olefins and process for producing the sameEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Jun 11, 1985·144 cites·11 claims
- 1197US5416228AProcess and catalyst for producing isotactic polyolefinsFINA TECHNOLOGY·Filed 1991·Granted May 16, 1995·167 cites·10 claims
- 1297US4975403ACatalyst systems for producing polyolefins having a broad molecular weight distributionFINA TECHNOLOGY·Filed 1988·Granted Dec 4, 1990·165 cites·10 claims
- 1397US4927797ACatalyst system for the polymerization of olefinsFINA TECHNOLOGY·Filed 1988·Granted May 22, 1990·161 cites·19 claims
- 1496US6184326B1Syndiotactic polypropyleneFINA TECHNOLOGY·Filed 1995·Granted Feb 6, 2001·121 cites·5 claims
- 1596US5633394ACatalyst compounds for olefin polymerizationEXXON CHEMICAL PATENTS INC·Filed 1994·Granted May 27, 1997·101 cites·8 claims
- 1695US6444833B1Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefinsBASELL TECHNOLOGY CO BV·Filed 1999·Granted Sep 3, 2002·106 cites·35 claims
- 1795US5846896AMetallocene catalyst systemsFINA TECHNOLOGY·Filed 1991·Granted Dec 8, 1998·59 cites·12 claims
- 1895US5663249ACatalyst and process for polymerization of olefinsFINA TECHNOLOGY·Filed 1994·Granted Sep 2, 1997·88 cites·22 claims
- 1995US5334677AProcess for producing syndiotactic polyolefinsFINA TECHNOLOGY·Filed 1991·Granted Aug 2, 1994·91 cites·13 claims
- 2094US5561092AMetallocene catalysts with lewis acids and aluminum alkylsFINA TECHNOLOGY·Filed 1993·Granted Oct 1, 1996·83 cites·36 claims
- 2194US5476914ASyndiotactic polypropyleneFINA TECHNOLOGY·Filed 1992·Granted Dec 19, 1995·88 cites·4 claims
- 2294US5459117ADoubly-conformationally locked, stereorigid catalysts for the preparation of tactiospecific polymersFiled 1993·Granted Oct 17, 1995·101 cites·22 claims
- 2394US4767735ACatalyst pretreatment processCOSDEN TECHNOLOGY·Filed 1987·Granted Aug 30, 1988·118 cites·16 claims
- 2493US5631202AStereospecific metallocene catalysts with stereolocking α-CP substituentsMONTELL TECHNOLOGY COMPANY BV·Filed 1993·Granted May 20, 1997·69 cites·7 claims
- 2593US5066738APolymerization of olefins with an improved catalyst system using a new electron donorFINA TECHNOLOGY·Filed 1990·Granted Nov 19, 1991·112 cites·10 claims
- 2692US7238818B2Heterocyclic metallocenes and polymerization catalystsBASELL POLYOLEFINE GMBH·Filed 2003·Granted Jul 3, 2007·39 cites·38 claims
- 2790US5763549ACationic metallocene catalysts based on organoaluminum anionsFINA TECHNOLOGY·Filed 1992·Granted Jun 9, 1998·56 cites·28 claims
- 2890US5519100AAddition of aluminum alkyl for improved metallocene catalystFINA TECHNOLOGY·Filed 1992·Granted May 21, 1996·57 cites·13 claims
- 2989US5807939APolymerization of alpha-olefins with cationic metallocene catalysts based on organoaluminum anionsFINA TECHNOLOGY·Filed 1995·Granted Sep 15, 1998·40 cites·4 claims
- 3089US5614457ACatalyst system using aluminum alkyl with ion-pair metallocene catalystsFINA TECHNOLOGY·Filed 1995·Granted Mar 25, 1997·55 cites·16 claims
- 3185US7851644B2Heterocyclic metallocenes and polymerization catalystsBASELL POLYOLEFINE GMBH·Filed 2007·Granted Dec 14, 2010·5 cites·19 claims
- 3285US6872790B2Alpha olefin polymer products and catalyst systemsFINA TECHNOLOGY·Filed 2001·Granted Mar 29, 2005·15 cites·30 claims
- 3383US6344577B1Process for making silicon bridged metallocene compounds and metallocene catalystsFINA TECHNOLOGY·Filed 2000·Granted Feb 5, 2002·9 cites·33 claims
- 3483US5580939AProcess and catalyst for polyolefin density and molecular weight controlEXXON CHEMICAL PATENTS INC·Filed 1995·Granted Dec 3, 1996·47 cites·12 claims
- 3583US5122583AEfficiency of a pre-polymerized catalystFINA TECHNOLOGY·Filed 1990·Granted Jun 16, 1992·73 cites·31 claims
- 3679US6369175B1Process for producing hemiisotactic polypropyleneFINA TECHNOLOGY·Filed 1996·Granted Apr 9, 2002·32 cites·2 claims
- 3778US7544749B2Polymerization catalysts, organic transition metal compounds, process for preparing polyolefins and polyolefinsBASELL POLYOLEFINE GMBH·Filed 2004·Granted Jun 9, 2009·16 cites·8 claims
- 3878US5883202AProcess for olefin polymerization using metallocene catalysts with Lewis acids and aluminum alkylsFINA TECHNOLOGY·Filed 1995·Granted Mar 16, 1999·31 cites·33 claims
- 3976US5393851AProcess for using metallocene catalyst in a continuous reactor systemFINA TECHNOLOGY·Filed 1992·Granted Feb 28, 1995·28 cites·28 claims
- 4075US7723450B2Transition metal compound, ligand system, catalyst system and process for preparing polyolefinsBASELL POLYOLEFINE GMBH·Filed 2005·Granted May 25, 2010·3 cites·4 claims
- 4174US6160072AProcess for polymerizing tactioselective polyolefins in condensed phase using titanocenesFiled 1997·Granted Dec 12, 2000·29 cites·20 claims
- 4273US6262199B1Process and catalyst for producing isotactic polyolefinsFINA TECHNOLOGY·Filed 1998·Granted Jul 17, 2001·26 cites·21 claims
- 4369US7504354B2Organometallic transition metal compound, biscyclopentadienyl ligand system, catalyst system and process for preparing polyolefinsBASELL POLYOLEFINE GMBH·Filed 2004·Granted Mar 17, 2009·8 cites·6 claims
- 4468US6180732B1Stereospecific metallocene catalysts with stereolocking α-cp substituentsFiled 1996·Granted Jan 30, 2001·31 cites·32 claims
- 4565US5710222AMethod for controlling the melting points and molecular weights of syndiotactic polyolefins using metallocene catalyst systemsFINA TECHNOLOGY·Filed 1992·Granted Jan 20, 1998·14 cites·30 claims
- 4663US6252019B1Process for polymerizing tactioselective polyolefins in condensed phase using hafnocenesMONTELL TECHNOLOGY COMPANY BV·Filed 1997·Granted Jun 26, 2001·17 cites·18 claims
- 4760US5688735AMethod for controlling the melting points and molecular weights of syndiotactic polyolefins using metallocene catalyst systemsFINA TECHNOLOGY·Filed 1995·Granted Nov 18, 1997·22 cites·45 claims
- 4859US6649712B2Process for the polymerization of alpha olefinsFINA TECHNOLOGY·Filed 2001·Granted Nov 18, 2003·2 cites·33 claims
- 4953US6117957AProcess for polymerization of olefins with silicon bridged metallocene catalyst systemsFINA TECHNOLOGY·Filed 1997·Granted Sep 12, 2000·11 cites·20 claims
- 5049US6069237AOpen-pentadienyl metallocenen ligands, polymerization catalysts/catalyst precursors and polymers therefromMONTELL TECHNOLOGY COMPANY BV·Filed 1995·Granted May 30, 2000·8 cites·19 claims
Showing the top 50 of 52 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →