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: 11312677
    Abstract: 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: Grant
    Filed: June 7, 2018
    Date of Patent: April 26, 2022
    Assignee: QATAR FOUNDATION FOR EDUCATION, SCIENCE AND COMMUNITY DEVELOPMENT
    Inventors: Sarim Dastgir, Francesco Ferretti, Muhammad Sharif, Ralf Jackstell, Matthias Beller, Douglas W. Stephan, Louie Fan
  • Publication number: 20210292266
    Abstract: 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: Application
    Filed: June 7, 2018
    Publication date: September 23, 2021
    Inventors: Sarim DASTGIR, Francesco FERRETTI, Muhammad SHARIF, Ralf JACKSTELL, Matthias BELLER, Douglas W. STEPHAN, Louie FAN
  • Patent number: 8642812
    Abstract: 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 is
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: February 4, 2014
    Assignee: Stephan Consulting Corporation
    Inventors: Douglas W. Stephan, Gregory C. Welch, Jenny S. J. McCahill
  • Publication number: 20130018207
    Abstract: 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 is
    Type: Application
    Filed: September 14, 2012
    Publication date: January 17, 2013
    Applicant: STEPHAN CONSULTING CORPORATION
    Inventors: Douglas W. Stephan, Preston A. Chase, Gregory C. Welch
  • Patent number: 8299284
    Abstract: 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 is
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: October 30, 2012
    Assignee: Stephan Consulting Corporation
    Inventors: Douglas W. Stephan, Preston A. Chase, Gregory C. Welch
  • Publication number: 20100048949
    Abstract: 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 is
    Type: Application
    Filed: November 14, 2007
    Publication date: February 25, 2010
    Applicant: STEPHAN CONSULTING CORPORATION
    Inventors: Douglas W. Stephan, Preston A. Chase, Gregory C. Welch
  • Patent number: 6649558
    Abstract: 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: Grant
    Filed: January 3, 2001
    Date of Patent: November 18, 2003
    Assignee: 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: 6440890
    Abstract: 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: Grant
    Filed: September 6, 2000
    Date of Patent: August 27, 2002
    Assignee: NOVA Chemicals (International) S.A.
    Inventors: Rupert Edward von Haken Spence, Stephen John Brown, Ryan Paul Wurz, Dusan Jeremic, Douglas W. Stephan
  • Patent number: 6355744
    Abstract: 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: Grant
    Filed: September 6, 2000
    Date of Patent: March 12, 2002
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Rupert Edward von Haken Spence, Douglas W. Stephan, Stephen John Brown, Dusan Jeremic, Qinyan Wang
  • Patent number: 6342463
    Abstract: 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: Grant
    Filed: February 25, 2000
    Date of Patent: January 29, 2002
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Douglas W. Stephan, Jeff C. Stewart, Stephen John Brown, John William Swabey, Qinyan Wang
  • Publication number: 20010007895
    Abstract: 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: Application
    Filed: January 3, 2001
    Publication date: July 12, 2001
    Applicant: 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: 6239061
    Abstract: 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: Grant
    Filed: November 23, 1999
    Date of Patent: May 29, 2001
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Qinyan Wang, Xiaoliang Gao, John McMeeking, Wei Xu, Douglas W. Stephan
  • Patent number: 6239238
    Abstract: 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: Grant
    Filed: June 15, 1999
    Date of Patent: May 29, 2001
    Assignee: 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: 6063879
    Abstract: 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: Grant
    Filed: October 29, 1997
    Date of Patent: May 16, 2000
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Douglas W. Stephan, Jeff C. Stewart, Stephen John Brown, John William Swabey, Qinyan Wang
  • Patent number: 5965677
    Abstract: 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: Grant
    Filed: October 29, 1997
    Date of Patent: October 12, 1999
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Douglas W. Stephan, Jeff C. Stewart, Daryll G. Harrison
  • Patent number: 5726335
    Abstract: Novel mononuclear Z.sup.IV trihydride, monoalkyl dihydride and deuteride compounds are prepared and are used as catalysts in dehydrocoupling reactions.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: March 10, 1998
    Assignee: University of Windsor
    Inventor: Douglas W. Stephan