Patents by Inventor Hajime Namikoshi

Hajime Namikoshi 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).

  • Glucan Derivative And Production Process Thereof
    Publication number: 20080090984
    Abstract: A glucan derivative (e.g., a cellulose acylate derivative) which is useful for a thermoplastic resin, is inhibited in hygroscopicity at a high level and is excellent in compatibility with a plasticizer or solubility in a solvent is provided. In the glucan derivative which comprises an acyl group and a graft chain formed from at least one graft component selected from a lactone and a hydroxycarboxylic acid, each bonding to a glucose unit of a glucan (e.g., a cellulose) constituting the glucan derivative, a hydroxyl group in the graft chain is protected with a protecting group. The graft chain may be formed from a C4-16lactone. The hydroxyl group in the graft chain may be protected with an acyl group (e.g., a C2-8alkylcarbonyl group such as acetyl group). The degree of substitution of the acyl group may be from 1 to 2.99, and the degree of substitution of the graft chain may be from 0.01 to 2.
    Type: Application
    Filed: August 26, 2005
    Publication date: April 17, 2008
    Inventors: Hajime Namikoshi, Hiroshi Katayama, Koichi Umemoto, Shinsuke Suzuki
  • Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
    Patent number: 5489387
    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: February 17, 1995
    Date of Patent: February 6, 1996
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Separation agent comprising aliphatic or aromatic ester of polysaccharide
    Patent number: 5472599
    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, 1995
    Date of Patent: December 5, 1995
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising aliphatic or aromatic ester of polysaccharide
    Patent number: 5415769
    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 19, 1994
    Date of Patent: May 16, 1995
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
    Patent number: 5415780
    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 4, 1994
    Date of Patent: May 16, 1995
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Separation agent comprising acyl-or carbamoyl-substituted polysaccharide
    Patent number: 5368737
    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: November 22, 1993
    Date of Patent: November 29, 1994
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Hajime Namikoshi, Tohru Shibata, Ichiro Okamoto
  • Separation agent comprising aliphatic or aromatic ester of polysaccharide
    Patent number: 5334311
    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: September 15, 1993
    Date of Patent: August 2, 1994
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • Separation agent comprising aliphatic or aromatic ester of polysaccharide
    Patent number: 5268098
    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 opticl isomers.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: December 7, 1993
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tohru Shibata, Hajime Namikoshi, Ichiro Okamoto
  • 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