Patents by Inventor Ichiro Okamoto

Ichiro Okamoto 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).

  • Separating with an agent comprising an aliphatic ester of a polysaccharide
    Patent number: 5192444
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: March 9, 1993
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
    Patent number: 5137638
    Abstract: Separation of a chemical substance is effected by treating a mixture thereof with a polysaccharide having a substituent for hydroxyl group an acyl group of the formula (1) or a carbamoyl group of the formula (2): ##STR1## wherein R represents an atomic group having a nucleus comprising a conjugated .pi.-bond system in which the number of bonds interposed between in atom contained therein and bonded with the carbonyl or amino group and an atom contained in the .pi.-bond system and most distant from said atom is at least 5 even in the shortest route.
    Type: Grant
    Filed: October 16, 1991
    Date of Patent: August 11, 1992
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Optical resolution with .beta.-1,4-xylan dibenzoate
    Patent number: 5135653
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: August 4, 1992
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoshio Okamoto, Koichi Hatada, Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separating with an agent comprising an aliphatic ester of a polysaccharide
    Patent number: 5089138
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: February 18, 1992
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
    Patent number: 5075009
    Abstract: Separation of a chemical substance is effected by treating a mixture thereof with a polysaccharide having a substitutent for hydroxyl group an acyl group of the formula (1) or a carbamoyl group of the formula (2): ##STR1## wherein R represents an atomic group having a nucleus comprising a conjugated .pi.-bond system in which the number of bonds interposed between an atom contained therein and bonded with the carbonyl or amino group and an atom contained in the .pi.-bond system and most distant from said atom is at least 5 even in the shortest route.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: December 24, 1991
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Separation agent comprising 1,3-glucan
    Patent number: 5059328
    Abstract: 1,3-glucan is effective to separate a compound from a mixture containing the same, in particular for the optical resolution.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: October 22, 1991
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separating with an agent comprising aliphatic ester of polysaccharide
    Patent number: 5041226
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: November 2, 1989
    Date of Patent: August 20, 1991
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Optical resolution with .beta.-1,4-mannan tribenzoate
    Patent number: 5032277
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: July 16, 1991
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoshio Okamoto, Koichi Hatada, Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
    Patent number: 5017290
    Abstract: Separation of a chemical substance is effected by treating a mixture thereof with a polysaccharide having a substituent for hydroxyl group an acyl group of the formula (1) or a carbamoyl group of the formula (2): ##STR1## wherein R represents an atomic group having a nucleus comprising a conjugated .pi.-bond system in which the number of bonds interposed between an atom contained therein and bonded with the carbonyl or amino group and an atom contained in the .pi.-bond system and most distant from said atom is at least 5 even in the shortest route.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: May 21, 1991
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Separation agent comprising 1,3-glucan
    Patent number: 5002669
    Abstract: 1,3-glucan is effective to separate a compound from a mixture containing the same, in particular for the optical resolution.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: March 26, 1991
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
    Patent number: 4966694
    Abstract: Separation of a chemical substance is effected by treating a mixture thereof with a polysaccharide having a substituent for hydroxyl group an acyl group of the formula (1) or a carbamoyl group of the formula (2): ##STR1## wherein R represents an atomic group having a nucleus comprising a conjugated .pi.-bond system in which the number of bonds interposed between an atom contained therein and bonded with the carbonyl or amino group and an atom contained in the .pi.-bond system and most distant from said atom is at least 5 even in the shortest route.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: October 30, 1990
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Optical resolution with tribenzoyl-b-1,4-chitosan
    Patent number: 4931184
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: June 5, 1990
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoshio Okamoto, Koichi Hatada, Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising 1,3-glucan
    Patent number: 4897198
    Abstract: 1,3-glucan is effective to separate a compound from a mixture containing the same, in particular for the optical resolution.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: January 30, 1990
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising aliphatic ester of polysaccharide
    Patent number: 4892659
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: July 27, 1988
    Date of Patent: January 9, 1990
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
    Patent number: 4879038
    Abstract: Separation of a chemical substance is effected by treating a mixture thereof with a polysaccharide having a substituent for hydroxyl group an acyl group of the formula (1) or a carbamoyl group of the formula (2): ##STR1## wherein R represents an atomic group having a nucleus comprising a conjugated .pi.-bond system in which the number of bonds interposed between an atom contained therein and bonded with the carbonyl or amino group and an atom contained in the .pi.-bond system and most distant from said atom is at least 5 even in the shortest route.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: November 7, 1989
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Resolving agent
    Patent number: 4846968
    Abstract: Disclosed is an agent for resolving a mixture of optical isomers which includes cellulose triacetate of the type II form combined with a carrier as a resolving agent, to separate said isomers from each other and means for performing chromatographic elution.
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: July 11, 1989
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoichi Yuki, Ichiro Okamoto, Tohru Shibata, Hiroyuki Nakamura
  • Separation agent comprising 1,3-glucan
    Patent number: 4830752
    Abstract: 1,3-glucan is effective to separate a compound from a mixture containing the same, in particular for the optical resolution.
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: May 16, 1989
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separating agent
    Patent number: 4818394
    Abstract: A mixture of chemical substances such as optical isomers, geometrical isomers and polymers having different molecular weight ranges is separated to each ingredient by use of a cellulose derivative having an aromatic ring in the chromatographic method.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: April 4, 1989
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoshio Okamoto, Koichi Hatada, Tohru Shibata, Ichiro Okamoto, Hiroyuki Nakamura
  • Resolving agent
    Patent number: 4786416
    Abstract: Disclosed is a method for resolving a mixture of optical isomers which comprises contacting said mixture with a cellulose triacetate consisting essential of the type II form, as a resolving agent, to separate said isomers from each other.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: November 22, 1988
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoichi Yuki, Ichiro Okamoto, Tohru Shibata, Hiroyuki Nakamura
  • Separation agent comprising aliphatic ester of polysaccharide
    Patent number: 4786415
    Abstract: A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: November 22, 1988
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto