Patents by Inventor Kazuko Otomo

Kazuko Otomo 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).

  • Polypeptide solution, artificial polypeptide fiber production method and polypeptide purification method using same
    Patent number: 9051453
    Abstract: A polypeptide solution of the present invention is a polypeptide solution in which a polypeptide derived from natural spider silk proteins is dissolved in a solvent. The solvent contains at least one selected from the following (i)-(iii): (i) DMSO; (ii) DMSO with an inorganic salt; and (iii) DMF with an inorganic salt. Further, in the present invention, an artificial polypeptide fiber is obtained by: using the polypeptide solution as a dope solution; and extruding the dope solution from a spinneret into a desolvation bath so as to eliminate the solvent from the dope solution and form a fiber to produce an undrawn yarn. Moreover, in the present invention, a polypeptide is purified by subjecting the polypeptide solution to heat treatment and thereafter removing an undissolved substance therefrom.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: June 9, 2015
    Assignee: SPIBER INC.
    Inventors: Junichi Sugahara, Kazuhide Sekiyama, Ryota Sato, Kaori Sekiyama, Mizuki Ishikawa, Shinya Murata, Kazuko Otomo
  • Polypeptide solution, artificial polypeptide fiber production method and polypeptide purification method using same
    Patent number: 9023142
    Abstract: A polypeptide solution of the present invention is a polypeptide solution in which a polypeptide derived from natural spider silk proteins is dissolved in a solvent. The solvent contains at least one selected from the following (i)-(iii): (i) DMSO; (ii) DMSO with an inorganic salt; and (iii) DMF with an inorganic salt. Further, in the present invention, an artificial polypeptide fiber is obtained by: using the polypeptide solution as a dope solution; and extruding the dope solution from a spinneret into a desolvation bath so as to eliminate the solvent from the dope solution and form a fiber to produce an undrawn yarn. Moreover, in the present invention, a polypeptide is purified by subjecting the polypeptide solution to heat treatment and thereafter removing an undissolved substance therefrom.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: May 5, 2015
    Assignee: Spiber Inc.
    Inventors: Junichi Sugahara, Kazuhide Sekiyama, Ryota Sato, Kaori Sekiyama, Mizuki Ishikawa, Shinya Murata, Kazuko Otomo
  • Polypeptide solution, artificial polypeptide fiber production method and polypeptide purification method using same
    Patent number: 8979992
    Abstract: A polypeptide solution of the present invention is a polypeptide solution in which a polypeptide derived from natural spider silk proteins is dissolved in a solvent. The solvent contains at least one selected from the following (i)-(iii): (i) DMSO; (ii) DMSO with an inorganic salt; and (iii) DMF with an inorganic salt. Further, in the present invention, an artificial polypeptide fiber is obtained by: using the polypeptide solution as a dope solution; and extruding the dope solution from a spinneret into a desolvation bath so as to eliminate the solvent from the dope solution and form a fiber to produce an undrawn yarn. Moreover, in the present invention, a polypeptide is purified by subjecting the polypeptide solution to heat treatment and thereafter removing an undissolved substance therefrom.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: March 17, 2015
    Assignee: Spiber Inc.
    Inventors: Junichi Sugahara, Kazuhide Sekiyama, Ryota Sato, Kaori Sekiyama, Mizuki Ishikawa, Shinya Murata, Kazuko Otomo
  • POLYPEPTIDE SOLUTION, ARTIFICIAL POLYPEPTIDE FIBER PRODUCTION METHOD AND POLYPEPTIDE PURIFICATION METHOD USING SAME
    Publication number: 20140245923
    Abstract: A polypeptide solution of the present invention is a polypeptide solution in which a polypeptide derived from natural spider silk proteins is dissolved in a solvent. The solvent contains at least one selected from the following (i)-(iii): (i) DMSO; (ii) DMSO with an inorganic salt; and (iii) DMF with an inorganic salt. Further, in the present invention, an artificial polypeptide fiber is obtained by: using the polypeptide solution as a dope solution; and extruding the dope solution from a spinneret into a desolvation bath so as to eliminate the solvent from the dope solution and form a fiber to produce an undrawn yarn. Moreover, in the present invention, a polypeptide is purified by subjecting the polypeptide solution to heat treatment and thereafter removing an undissolved substance therefrom.
    Type: Application
    Filed: October 29, 2012
    Publication date: September 4, 2014
    Inventors: Junichi Sugahara, Kazuhide Sekiyama, Ryota Sato, Kaori Sekiyama, Mizuki Ishikawa, Shinya Murata, Kazuko Otomo