Ewen; John A.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Ewen; John A..The latest application filed is for "heterocyclic metallocenes and polymerization catalysts".

Company Profile

0.48.8

Ewen; John A. - Houston TX
Ewen; John A. - Lake Placid FL

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Heterocyclic metallocenes and polymerization catalysts Grant 7,851,644 - Ewen , et al. December 14, 2	2010-12-14
Heterocyclic metallocenes and polymerization catalysts App 20090286945 - Ewen; John A. ; et al.	2009-11-19
Polymerization catalysts, organic transition metal compounds, process for preparing polyolefins and polyolefins Grant 7,544,749 - Jones , et al. June 9, 2	2009-06-09
Organometallic transition metal compound, biscyclopentadienyl ligand system, catalyst system and process for preparing polyolefins Grant 7,504,354 - Elder , et al. March 17, 2	2009-03-17
Heterocyclic metallocenes and polymerization catalysts App 20080090978 - Ewen; John A. ; et al.	2008-04-17
Alpha olefin catalyst systems Grant 7,332,456 - Ewen February 19, 2	2008-02-19
Transition Metal Compound, Ligand System, Catalyst System and Process for Preparing Polyolefins App 20070260023 - Jones; Robert L. ; et al.	2007-11-08
Organometallic Transition Metal Compound, Biscyclopentadienyl Ligand System, Catalyst System and Process for Preparing Polyolefins App 20070260025 - Elder; Michael J. ; et al.	2007-11-08
Heterocyclic metallocenes and polymerization catalysts Grant 7,238,818 - Ewen , et al. July 3, 2	2007-07-03
Heterocyclic metallocenes and polymerization catalysts App 20050192418 - Ewen, John A. ; et al.	2005-09-01
Alpha olefin catalyst systems App 20050165184 - Ewen, John A.	2005-07-28
Alpha olefin polymer products and catalyst systems Grant 6,872,790 - Ewen March 29, 2	2005-03-29
Process for the polymerization of alpha olefins Grant 6,649,712 - Ewen November 18, 2	2003-11-18
Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins Grant 6,635,779 - Ewen , et al. October 21, 2	2003-10-21
Method for varying the melting points and molecular weights of polyolefins using metallocene catalyst systems App 20020193537 - Ewen, John A.	2002-12-19
Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins Grant 6,444,833 - Ewen , et al. September 3, 2	2002-09-03
Alpha olefin polymer products and catalyst systems App 20020111444 - Ewen, John A.	2002-08-15
Open-pentadienyl metallocenes, precursors thereof and polymerization catalysts therefrom Grant 6,403,772 - Ewen , et al. June 11, 2	2002-06-11
Process for producing hemiisotactic polypropylene Grant 6,369,175 - Ewen April 9, 2	2002-04-09
Process and catalyst for producing isotactic polyolefins Grant 6,262,199 - Ewen , et al. July 17, 2	2001-07-17
Syndiotactic polypropylene Grant 6,184,326 - Razavi , et al. February 6, 2	2001-02-06
Stereospecific metallocene catalysts with stereolocking .alpha.-cp substituents Grant 6,180,732 - Ewen January 30, 2	2001-01-30
Process for polymerization of olefins with silicon bridged metallocene catalyst systems Grant 6,117,957 - Ewen September 12, 2	2000-09-12
Open-pentadienyl metallocenen ligands, polymerization catalysts/catalyst precursors and polymers therefrom Grant 6,069,237 - Ewen , et al. May 30, 2	2000-05-30
Process for olefin polymerization using metallocene catalysts with Lewis acids and aluminum alkyls Grant 5,883,202 - Ewen , et al. March 16, 1	1999-03-16
Metallocene catalyst systems Grant 5,846,896 - Ewen December 8, 1	1998-12-08
Method for controlling the melting points and molecular weights of syndiotactic polyolefins using metallocene catalyst systems Grant 5,710,222 - Ewen , et al. January 20, 1	1998-01-20
Method for controlling the melting points and molecular weights of syndiotactic polyolefins using metallocene catalyst systems Grant 5,688,735 - Ewen , et al. November 18, 1	1997-11-18
Catalyst and process for polymerization of olefins Grant 5,663,249 - Ewen , et al. September 2, 1	1997-09-02
Catalyst compounds for olefin polymerization Grant 5,633,394 - Welborn, Jr. , et al. May 27, 1	1997-05-27
Stereospecific metallocene catalysts with stereolocking .alpha.-CP substituents Grant 5,631,202 - Ewen May 20, 1	1997-05-20
Catalyst system using aluminum alkyl with ion-pair metallocene catalysts Grant 5,614,457 - Ewen , et al. March 25, 1	1997-03-25
Process and catalyst for polyolefin density and molecular weight control Grant 5,580,939 - Ewen , et al. December 3, 1	1996-12-03
Metallocene catalysts with lewis acids and aluminum alkyls Grant 5,561,092 - Ewen , et al. October 1, 1	1996-10-01
Addition of aluminum alkyl for improved metallocene catalyst Grant 5,519,100 - Ewen , et al. May 21, 1	1996-05-21
Syndiotactic polypropylene Grant 5,476,914 - Ewen , et al. December 19, 1	1995-12-19
Doubly-conformationally locked, stereorigid catalysts for the preparation of tactiospecific polymers Grant 5,459,117 - Ewen October 17, 1	1995-10-17
Process and catalyst for producing isotactic polyolefins Grant 5,416,228 - Ewen , et al. May 16, 1	1995-05-16
Process for using metallocene catalyst in a continuous reactor system Grant 5,393,851 - Ewen , et al. February 28, 1	1995-02-28
Preparation of metallocene catalysts for polymerization of olefins Grant 5,387,568 - Ewen , et al. February 7, 1	1995-02-07
Process for producing syndiotactic polyolefins Grant 5,334,677 - Razavi , et al. August 2, 1	1994-08-02
Process and catalyst for polyolefin density and molecular weight control Grant 5,324,800 - Welborn, Jr. , et al. June 28, 1	1994-06-28
Process and catalyst for producing syndiotactic polyolefins Grant 5,225,500 - Elder , et al. July 6, 1	1993-07-06
Process and catalyst for producing syndiotactic polyolefins Grant 5,155,080 - Elder , et al. * October 13, 1	1992-10-13
Efficiency of a pre-polymerized catalyst Grant 5,122,583 - Ewen , et al. June 16, 1	1992-06-16
Polymerization of olefins with an improved catalyst system using a new electron donor Grant 5,066,738 - Ewen November 19, 1	1991-11-19
Catalyst for producing hemiisotactic polypropylene Grant 5,036,034 - Ewen July 30, 1	1991-07-30
Catalyst systems for producing polyolefins having a broad molecular weight distribution Grant 4,975,403 - Ewen * December 4, 1	1990-12-04
Process and catalyst for producing reactor blend polyolefins Grant 4,937,299 - Ewen , et al. * June 26, 1	1990-06-26
Process and catalyst for producing polyethylene having a broad molecular weight distribution Grant 4,935,474 - Ewen , et al. June 19, 1	1990-06-19
Catalyst system for the polymerization of olefins Grant 4,927,797 - Ewen May 22, 1	1990-05-22
Process and catalyst for producing syndiotactic polyolefins Grant 4,892,851 - Ewen , et al. January 9, 1	1990-01-09
Hafnium metallocene catalyst for the polymerization of olefins Grant 4,794,096 - Ewen December 27, 1	1988-12-27
Catalyst pretreatment process Grant 4,767,735 - Ewen , et al. August 30, 1	1988-08-30
Process and catalyst for producing polyethylene having a broad molecular weight distribution Grant 4,530,914 - Ewen , et al. July 23, 1	1985-07-23
Isotactic-stereoblock polymers of alpha-olefins and process for producing the same Grant 4,522,982 - Ewen June 11, 1	1985-06-11

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