Patents by Inventor Douglas W. Stephan
Douglas W. Stephan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11312677Abstract: Disclosed are methods or processes of synthesizing building blocks and feedstocks for producing a broader range of polymers, including renewable polymers, from renewable resources such as CO2. In a process of manufacturing a renewable feedstock for polymer production, a CO2 derived lactone is prepared and processed to form the renewable feedstock. The process may include alkoxycarbonylation of the CO2 derived lactone to form a diester and hydrogenation of the diester.Type: GrantFiled: June 7, 2018Date of Patent: April 26, 2022Assignee: QATAR FOUNDATION FOR EDUCATION, SCIENCE AND COMMUNITY DEVELOPMENTInventors: Sarim Dastgir, Francesco Ferretti, Muhammad Sharif, Ralf Jackstell, Matthias Beller, Douglas W. Stephan, Louie Fan
-
Publication number: 20210292266Abstract: Disclosed are methods or processes of synthesizing building blocks and feedstocks for producing a broader range of polymers, including renewable polymers, from renewable resources such as CO2. In a process of manufacturing a renewable feedstock for polymer production, a CO2 derived lactone is prepared and processed to form the renewable feedstock. The process may include alkoxycarbonylation of the CO2 derived lactone to form a diester and hydrogenation of the diester.Type: ApplicationFiled: June 7, 2018Publication date: September 23, 2021Inventors: Sarim DASTGIR, Francesco FERRETTI, Muhammad SHARIF, Ralf JACKSTELL, Matthias BELLER, Douglas W. STEPHAN, Louie FAN
-
Patent number: 8642812Abstract: A compound having the formula (I) where each of R1, R2, R3 and R4 is independently C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C4-C20 branched alkyl-, C16-C20 linear alkyl-, RO—, —NRR?, —PRR?, —SR, fluoro substituted forms thereof, and perfluoro forms thereof: and R5 is C6-C18 aryl-, C3-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C3-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; where R and R? are each independently C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C4-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; A is N, P, S, or O with the proviso that when A is S, R2 is a nullity; and M isType: GrantFiled: September 14, 2012Date of Patent: February 4, 2014Assignee: Stephan Consulting CorporationInventors: Douglas W. Stephan, Gregory C. Welch, Jenny S. J. McCahill
-
Publication number: 20130018207Abstract: A compound having the formula (I) where each of R1, R2, R3 and R4 is independently C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl s?bstituent, C4-C20 branched alkyl-, C16-C20 linear alkyl-, RO—, —NRR?, —PRR?, —SR, fluoro substituted forms thereof, and perfluoro forms thereof: and R5 is C6-C18 aryl-, C5-C8cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C3-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; where R and R? are each independently C6-C18 aryl-, C5 -C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C4-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; A is N, P, S, or O with the proviso that when A is S, R2 is a nullity; and M isType: ApplicationFiled: September 14, 2012Publication date: January 17, 2013Applicant: STEPHAN CONSULTING CORPORATIONInventors: Douglas W. Stephan, Preston A. Chase, Gregory C. Welch
-
Patent number: 8299284Abstract: A compound having the formula (I) where each of R1, R2, R3 and R4 is independently C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C4-C20 branched alkyl-, C16-C20 linear alkyl-, RO—, —NRR?, —PRR?, —SR, fluoro substituted forms thereof, and perfluoro forms thereof: and R5 is C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C3-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; where R and R? are each independently C6-C18aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C4-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; A is N, P, S, or O with the proviso that when A is S, R2 is a nullify; and M isType: GrantFiled: November 14, 2007Date of Patent: October 30, 2012Assignee: Stephan Consulting CorporationInventors: Douglas W. Stephan, Preston A. Chase, Gregory C. Welch
-
Publication number: 20100048949Abstract: A compound having the formula (I) where each of R1, R2, R3 and R4 is independently C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C4-C20 branched alkyl-, C16-C20 linear alkyl-, RO—, —NRR?, —PRR?, —SR, fluoro substituted forms thereof, and perfluoro forms thereof: and R5 is C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C3-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; where R and R? are each independently C6-C18aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C4-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substituted forms thereof, and perfluoro forms thereof; A is N, P, S, or O with the proviso that when A is S, R2 is a nullify; and M isType: ApplicationFiled: November 14, 2007Publication date: February 25, 2010Applicant: STEPHAN CONSULTING CORPORATIONInventors: Douglas W. Stephan, Preston A. Chase, Gregory C. Welch
-
Patent number: 6649558Abstract: Organometallic complexes having two phosphinimine ligands and at least one activatable ligand are catalyst components for olefin polymerization. Preferred polymerization systems are prepared by combining the organometallic complexes with an ionic activator and/or an alumoxane. Preferred catalyst components contain titanium, zirconium, or hafnium and are activated with an ionic activator to form catalysts for ethylene polymerization.Type: GrantFiled: January 3, 2001Date of Patent: November 18, 2003Assignee: Nova Chemicals (International) S.A.Inventors: Stephen John Brown, Xiaoliang Gao, Daryll G. Harrison, Ian McKay, Linda Koch, Qinyan Wang, Wei Xu, Rupert Edward von Haken Spence, Douglas W. Stephan
-
Patent number: 6440890Abstract: New group 4 organometallic complexes are characterized by having a phosphinimine ligand and two or more cyclopentadienyl ligands. Certain of these complexes exhibit unusual behavior when examined by nuclear magnetic resonance (NMR) techniques. Well defined crystals of the inventive complexes have been isolated and analyzed by x-ray crystallography. The complexes have also been found to be polymerization catalysts which are surprisingly more active than their simple metallocene analogs.Type: GrantFiled: September 6, 2000Date of Patent: August 27, 2002Assignee: NOVA Chemicals (International) S.A.Inventors: Rupert Edward von Haken Spence, Stephen John Brown, Ryan Paul Wurz, Dusan Jeremic, Douglas W. Stephan
-
Patent number: 6355744Abstract: Organometallic complexes of titanium or zirconium having only three ligands (namely a cyclopentadienyl ligand, a phosphinimine ligand and an activatable ligand) are catalyst components for olefin polymerization. Preferred polymerization systems are prepared by combining the organometallic complexes with an ionic activator and/or an alumoxane. Preferred catalyst components contain titanium (III) and are used in ethylene polymerization.Type: GrantFiled: September 6, 2000Date of Patent: March 12, 2002Assignee: Nova Chemicals (International) S.A.Inventors: Rupert Edward von Haken Spence, Douglas W. Stephan, Stephen John Brown, Dusan Jeremic, Qinyan Wang
-
Patent number: 6342463Abstract: This invention is a solution process for the preparation of high molecular weight ethylene copolymers comprising contacting olefin monomers, with a catalyst system at a polymerization temperature at or above about 80° C. with a catalyst system comprising an unbridged Group 4 metal compound having a monocyclopentadienyl ligand, a phosphinimine ligand and at least one uninegative, activation reactive ligand. The process can be practiced at a reaction temperature of at least 80° C. to obtain high number average molecular weight polymer.Type: GrantFiled: February 25, 2000Date of Patent: January 29, 2002Assignee: Nova Chemicals (International) S.A.Inventors: Douglas W. Stephan, Jeff C. Stewart, Stephen John Brown, John William Swabey, Qinyan Wang
-
Publication number: 20010007895Abstract: Organometallic complexes having two phosphinimine ligands and at least one activatable ligand are catalyst components for olefin polymerization. Preferred polymerization systems are prepared by combining the organometallic complexes with an ionic activator and/or an alumoxane. Preferred catalyst components contain titanium, zirconium, or hafnium and are activated with an ionic activator to form catalysts for ethylene polymerization.Type: ApplicationFiled: January 3, 2001Publication date: July 12, 2001Applicant: NOVA CHEMICALS (INTERNATIONAL)S.A.Inventors: Stephen John Brown, Xiaoliang Gao, Daryll G. Harrison, Ian McKay, Linda Koch, Qinyan Wang, Wei Xu, Rupert Edward von Haken Spence, Douglas W. Stephan
-
Patent number: 6239061Abstract: Aluminum-phosphinimine complexes function as a component in a catalyst system for the (co)polymerization of ethylene. The inventive catalyst components form a highly productive polymerization system when activated with so-called “ionic activators”. The need for conventional transition metal catalyst metals (such as titanium, hafnium, zirconium or vanadium) is eliminated.Type: GrantFiled: November 23, 1999Date of Patent: May 29, 2001Assignee: Nova Chemicals (International) S.A.Inventors: Qinyan Wang, Xiaoliang Gao, John McMeeking, Wei Xu, Douglas W. Stephan
-
Patent number: 6239238Abstract: Organometallic complexes having two phosphinimine ligands and at least one activatable ligand are catalyst components for olefin polymerization. Preferred polymerization systems are prepared by combining the organometallic complexes with an ionic activator and/or an alumoxane. Preferred catalyst components contain titanium, zirconium, or hafnium and are activated with an ionic activator to form catalysts for ethylene polymerization.Type: GrantFiled: June 15, 1999Date of Patent: May 29, 2001Assignee: Nova Chemicals (International) S.A.Inventors: Stephen John Brown, Xiaoliang Gao, Daryll G. Harrison, Ian McKay, Linda Koch, Qinyan Wang, Wei Xu, Rupert Edward von Haken Spence, Douglas W. Stephan
-
Patent number: 6063879Abstract: This invention is a solution process for the preparation of high molecular weight ethylene copolymers comprising contacting olefin monomers, with a catalyst system at a polymerization temperature at or above about 80.degree. C. with a catalyst system comprising an unbridged Group 4 metal compound having a monocyclopentadienyl ligand, a phosphinimine ligand and at least one uninegative, activation reactive ligand. The process can be practiced at a reaction temperature of at least 80.degree. C. to obtain high number average molecular weight polymer.Type: GrantFiled: October 29, 1997Date of Patent: May 16, 2000Assignee: Nova Chemicals (International) S.A.Inventors: Douglas W. Stephan, Jeff C. Stewart, Stephen John Brown, John William Swabey, Qinyan Wang
-
Patent number: 5965677Abstract: A catalyst component which is especially useful in so-called "slurry" or "gas phase" olefin polymerizations and which comprises an organometallic complex of a group 4 metal (having a cyclopentadienyl-type ligand and a phosphinimine ligand) and a particulate support. The catalyst component forms an excellent catalyst system when combined with an activator such as an aluminoxane or a so-called "substantially non-coordinating anion". In a preferred embodiment the organometallic complex and the activator are both deposited on the particulate support.Type: GrantFiled: October 29, 1997Date of Patent: October 12, 1999Assignee: Nova Chemicals (International) S.A.Inventors: Douglas W. Stephan, Jeff C. Stewart, Daryll G. Harrison
-
Patent number: 5726335Abstract: Novel mononuclear Z.sup.IV trihydride, monoalkyl dihydride and deuteride compounds are prepared and are used as catalysts in dehydrocoupling reactions.Type: GrantFiled: December 12, 1995Date of Patent: March 10, 1998Assignee: University of WindsorInventor: Douglas W. Stephan