Patents by Inventor Heimei Yuki

Heimei Yuki 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).

  • Polymerizable, optically active polymer and process for preparing polymerizable polymer
    Patent number: 4681919
    Abstract: A polymerizable polymer is obtained by the anionic polymerization and termination by use of a vinyl monomer. It produces a graft copolymer by co-polymerization with another monomer. The process produces a new, polymerizable, optically active polymer and a graft copolymer thereof.
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: July 21, 1987
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Novel optically active polymer, preparation and use
    Patent number: 4613442
    Abstract: A novel optically active polymer comprising structural elements of the formula: ##STR1## The polymer is applicable for the optical resolution of a racemic mixture through, for instance, column chromatography.
    Type: Grant
    Filed: January 9, 1985
    Date of Patent: September 23, 1986
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Methacrylic ester useful as an optical resolving agent
    Patent number: 4555574
    Abstract: A methacrylic ester which functions as the main unit of a polymer or copolymer which is useful as an agent to optically resolve racemic mixtures of compounds.
    Type: Grant
    Filed: July 11, 1984
    Date of Patent: November 26, 1985
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Polymerizable, optically active polymer and process for preparing polymerizable polymer
    Patent number: 4554323
    Abstract: A polymerizable polymer is obtained by the anionic polymerization and termination by use of a vinyl monomer. It produces a graft copolymer by co-polymerization with another monomer. The process produces a new, polymerizable, optically active polymer and a graft copolymer thereof.
    Type: Grant
    Filed: May 10, 1983
    Date of Patent: November 19, 1985
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Process for preparing optically active polymer
    Patent number: 4554334
    Abstract: An optically active polymer is obtained by polymerizing a vinyl monomer in the presence of a catalyst which comprises an asymmetric ligand compound of the formula (I) or (II): ##STR1## in which R.sub.1 and R.sub.4 each are --O--R.sub.7, --S--R.sub.7, ##STR2## R.sub.2, R.sub.3, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 each are an alkyl group having 1 to 10 carbon atoms; X is hydrogen, an alkyl group having 1 to 10 carbon atoms or a halogen; and n is a number of 1 to 4; and an anionic initiator to form a complex with said ligand compound.
    Type: Grant
    Filed: August 10, 1984
    Date of Patent: November 19, 1985
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Optically active polymer preparation and use
    Patent number: 4511475
    Abstract: A novel optically active polymer comprising structural elements of the formula: ##STR1## The polymer is applicable for the optical resolution of a racemic mixture through, for instance, column chromatography.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: April 16, 1985
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Polymerization process of optically active polymer and catalyst therefor
    Patent number: 4478953
    Abstract: An optically active polymer is obtained by polymerizing a vinyl monomer in the presence of a catalyst which comprises an asymmetric ligand compound of the formula (I) or (II): ##STR1## in which R.sub.1 and R.sub.4 each are ##STR2## R.sub.2, R.sub.3, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 each are an alkyl group having 1 to 10 carbon atoms; X is hydrogen, an alkyl group having 1 to 10 carbon atoms or a halogen; and n is a number of 1 to 4; and an anionic initiator to form a complex with said ligand compound.
    Type: Grant
    Filed: March 3, 1983
    Date of Patent: October 23, 1984
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Organic polymers of methacrylate esters
    Patent number: 4473690
    Abstract: A new organic polymer useful for the optical resolution or solvent fractionation is provided. The organic polymer is a homopolymer or copolymer comprising mainly a specific methacrylate ester constitutional unit and having (+) or (-) optical rotation and, therefore, an optical activity.
    Type: Grant
    Filed: June 16, 1982
    Date of Patent: September 25, 1984
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto
  • Novel optically active polymer preparation and use
    Patent number: 4375495
    Abstract: A novel optically active polymer comprising structural elements of the formula: ##STR1## The polymer is applicable for the optical resolution of a racemic mixture through, for instance, column chromatography.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: March 1, 1983
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Heimei Yuki, Yoshio Okamoto