Patents by Inventor Haruyasu Yamaji

Haruyasu Yamaji 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).

  • Method for producing ?-hydroxycarboxylic acid dimeric cyclic ester
    Patent number: 11046665
    Abstract: Provided is a method for producing a high purity ?-hydroxycarboxylic acid dimeric cyclic ester while heavy-component formation from an ?-hydroxycarboxylic acid oligomer is suppressed. An ?-hydroxycarboxylic acid dimeric cyclic ester is obtained by performing a depolymerization reaction in the coexistence of an inorganic acid or an inorganic acid salt or a mixture thereof; and an organophosphorus compound.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: June 29, 2021
    Assignee: KUREHA CORPORATION
    Inventors: Haruyasu Yamaji, Yoshinori Suzuki, Toshihiko Ono
  • Glycolide production method
    Patent number: 11001565
    Abstract: The object of the present invention is to provide a glycolide production method capable of further increasing the production rate of glycolide. The glycolide production method according to the present invention includes adding metal iron to an aqueous glycolic acid solution, subjecting glycolic acid contained in the aqueous glycolic acid solution to which the metal iron is added, to dehydrating polycondensation to obtain a glycolic acid oligomer, and heating and depolymerizing the glycolic acid oligomer to obtain glycolide.
    Type: Grant
    Filed: February 20, 2019
    Date of Patent: May 11, 2021
    Assignee: KUREHA CORPORATION
    Inventors: Yuta Yamadoi, Yoshinori Suzuki, Takenori Tose, Haruyasu Yamaji, Toshihiko Ono
  • GLYCOLIDE PRODUCTION METHOD
    Publication number: 20210087162
    Abstract: The object of the present invention is to provide a glycolide production method capable of sufficiently increasing the production rate of glycolide. The glycolide production method according to the present invention includes: adding metal titanium to an aqueous glycolic acid solution; subjecting glycolic acid contained in the aqueous glycolic acid solution to which the metal titanium is added, to dehydrating polycondensation to obtain a glycolic acid oligomer; and heating and depolymerizing the glycolic acid oligomer to obtain glycolide.
    Type: Application
    Filed: March 6, 2019
    Publication date: March 25, 2021
    Applicant: Kureha Corporation
    Inventors: Haruyasu YAMAJI, Yuta YAMADOI, Yoshinori SUZUKI, Toshihiko ONO
  • GLYCOLIDE PRODUCTION METHOD
    Publication number: 20210002248
    Abstract: The object of the present invention is to provide a glycolide production method capable of further increasing the production rate of glycolide. The glycolide production method according to the present invention includes adding metal iron to an aqueous glycolic acid solution, subjecting glycolic acid contained in the aqueous glycolic acid solution to which the metal iron is added, to dehydrating polycondensation to obtain a glycolic acid oligomer, and heating and depolymerizing the glycolic acid oligomer to obtain glycolide.
    Type: Application
    Filed: February 20, 2019
    Publication date: January 7, 2021
    Applicant: Kureha Corporation
    Inventors: Yuta YAMADOI, Yoshinori SUZUKI, Takenori TOSE, Haruyasu YAMAJI, Toshihiko ONO
  • METHOD FOR PRODUCING a-HYDROXYCARBOXYLIC ACID DIMERIC CYCLIC ESTER
    Publication number: 20190330175
    Abstract: Provided is a method for producing a high purity ?-hydroxycarboxylic acid dimeric cyclic ester while heavy-component formation from an ?-hydroxycarboxylic acid oligomer is suppressed. An ?-hydroxycarboxylic acid dimeric cyclic ester is obtained by performing a depolymerization reaction in the coexistence of an inorganic acid or an inorganic acid salt or a mixture thereof; and an organophosphorus compound.
    Type: Application
    Filed: December 18, 2017
    Publication date: October 31, 2019
    Inventors: Haruyasu YAMAJI, Yoshinori Suzuki, Toshihiko ONO
  • METHOD FOR PRODUCING GLYCOLIDE
    Publication number: 20140343298
    Abstract: A method for producing glycolide comprises depolymerizing a glycolic acid oligomer in the presence of a phenol-based antioxidant.
    Type: Application
    Filed: September 10, 2012
    Publication date: November 20, 2014
    Applicant: KUREHA CORPORATION
    Inventors: Haruyasu Yamaji, Kazuyuki Yamane, Shigeru Suzuki