Patents by Inventor Chi-Wing Tsang

Chi-Wing Tsang 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: 9115249
    Abstract: The present disclosure relates to processes and methods of generating hydrogen via the dehydrocoupling of amine boranes using ligand-stabilized homogenous metal catalysts. The amine-borane is shown by the formula (I), R1R2N—BHR3R4. A process is also shown for the preparation of a linear, branched or cyclic polymer which comprises a repeating unit of the formula (II), —[R1R2N—BR3R4]-n, by reacting HR1R2N—BHR3R4 in the presence of at least one ligand-stabilized metal catalyst.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: August 25, 2015
    Assignee: Kanata Chemical Technologies Inc.
    Inventors: Kamaluddin Abdur-Rashid, Todd Graham, Chi-Wing Tsang, Xuanhua Chen, Rongwei Guo, Wenli Jia
  • Patent number: 8716508
    Abstract: The present disclosure relates to a method for preparing a metal catalyst comprising at least one ligand that is coordinated to the metal through at least one phosphorous (P) atom and at least one nitrogen (N) atom, the method comprising reacting a metal pre-cursor complex with an acid addition salt of an aminophosphine, diaminophosphine, aminodiphosphine or diaminodiphosphine, in the presence of a base.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: May 6, 2014
    Assignee: Kanata Chemical Technologies Inc.
    Inventors: Kamaluddin Abdur-Rashid, Dino Amoroso, Xuanhua Chen, Rongwei Guo, Shuiming Lu, Chi-Wing Tsang
  • Patent number: 8518368
    Abstract: The present disclosure relates to processes and methods of generating hydrogen via the hydrolysis or solvolyis of a compound of the formula (I), R1R2HNBHR3R4, using ligand-stabilized homogeneous metal catalysts.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: August 27, 2013
    Assignee: Kanata Chemical Technologies Inc.
    Inventors: Kamaluddin Abdur-Rashid, Todd Graham, Chi-Wing Tsang, Xuanhua Chen, Rongwei Guo, Wenli Jia, Dino Amoroso, Christine Sui-Seng
  • Publication number: 20130053566
    Abstract: Cationic palladium catalysts comprising diamino carbene ligands, wherein the catalysts are of the formula [Pd(X)q(LBX)t(DC)]r+[Ym-]p or [Pd(X)q(LB)n(LBX)t(DC)]2a+[V?]u[Z2?]y, wherein DC is a diamino carbene ligand, X is an anionic ligand, LBX is a combined anionic and neutral ligand, and Y, V, and Z are non-coordinating anions. The compounds are useful in catalytic reactions, including cross-coupling reactions and hydroamination reactions. In particular, the catalysts are used in the following reactions: Suzuki-Miyaura coupling, Kumada coupling, Negishi coupling, Sonogashira coupling, Hartwig-Buchwald amination, and Heck-Mizoroki coupling.
    Type: Application
    Filed: April 14, 2011
    Publication date: February 28, 2013
    Inventors: Kamaluddin Abdur-Rashid, Dino Amoroso, Chi-Wing Tsang, Wenli Jia
  • Publication number: 20120046479
    Abstract: The present disclosure relates to a method for preparing a metal catalyst comprising at least one ligand that is coordinated to the metal through at least one phosphorous (P) atom and at least one nitrogen (N) atom, the method comprising reacting a metal pre-cursor complex with an acid ad salt of an aminophosphine, diaminophosphine, aminodiphosphine or diaminodiphosphine, in the presence of a base.
    Type: Application
    Filed: October 8, 2009
    Publication date: February 23, 2012
    Inventors: Kamaluddin Abdur-Rashid, Dino Amoroso, Xuanhua Chen, Rongwei Guo, Shuiming Lu, Chi-Wing Tsang
  • Publication number: 20110104046
    Abstract: The present disclosure relates to processes and methods of generating hydrogen via the dehydrocoupling of amine boranes using ligand-stabilized homogenous metal catalysts. The amine-borane is shown by the formula (I), R1R2N—BHR3R4. A process is also shown for the preparation of a linear, branched or cyclic polymer which comprises a repeating unit of the formula (II), —[R1R2N—BR3R4]-n, by reacting HR1R2N—BHR3R4 in the presence of at least one ligand-stabilized metal catalyst.
    Type: Application
    Filed: May 15, 2009
    Publication date: May 5, 2011
    Inventors: Kamaluddin Abdur-Rashid, Todd Graham, Chi-Wing Tsang, Xuanhua Chen, Rongwei Guo, Wenli Jia
  • Publication number: 20110070152
    Abstract: The present disclosure relates to processes and methods of generating hydrogen via the hydrolysis or solvolyis of a compound of the formula (I), R1R2HNBHR3R4, using ligand-stabilized homogeneous metal catalysts.
    Type: Application
    Filed: May 16, 2008
    Publication date: March 24, 2011
    Inventors: Kamaluddin Abdur-Rashid, Todd Graham, Chi-Wing Tsang, Xuanhua Chen, Rongwei Guo, Wenli Jia, Dino Amoroso, Christine Sui-Seng
  • Publication number: 20100311975
    Abstract: The present disclosure includes catiome complexes of iron, ruthenium, and osmium, and their use as catalysts in organic synthesis transformations including the hydrogenation of unsaturated compounds. The complexes are represented by the following formulae I, II, III, IV, and V, wherein M is Fe, Ru or Os, P is a monodentate ligand with a phosphorus donor atom, P2 is a bidentate neutral ligand with two phosphorus donor atoms, N2 is a bidentate neutral ligand with two nitrogen donor atoms, PN is a bidentate neutral ligand with phosphorus and nitrogen donor atoms, PNNP is a tetradentate neutral ligand bonded to M via two phosphorus and two nitrogen atoms, X is any anionic ligand, LB is any neutral Lewis base, Y is any non-coordinating anion, n is 0, 1, or 2, m is 1 or 2, q is 0 or 1, r is 1 or 2 and q+r=2.
    Type: Application
    Filed: October 30, 2008
    Publication date: December 9, 2010
    Inventors: Kamaluddin Abdur-Rashid, Dino Amoroso, Rongwei Guo, Xuanhua Chen, Christine Sui-Seng, Chi-Wing Tsang, Wenli Jia
  • Patent number: 7728091
    Abstract: Methods for polymerization of phosphaalkenes using initiators are provided. Also provided are polymers and co-polymers in which the polymer backbone contains tracts of carbon and phosphorous atoms in approximately equimolar amounts. C—P bonds in the polymers of this invention may be predominantly in a head-to-tail arrangement or mixed arrangements. Co-polymers may comprise polyolefin monomer units.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: June 1, 2010
    Assignee: The University of British Columbia
    Inventors: Derek Gates, Chi-Wing Tsang, Mandy Yam