Patents by Inventor Akiko Tsuchida

Akiko Tsuchida 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).

  • Patent number: 11421043
    Abstract: There is provides a method for producing sieved low-substituted hydroxypropyl cellulose (L-HPC) at improved yield, while maintaining flowability and tablet properties. More specifically, there is provided a method for producing sieved L-HPC including a first sieving step of sieving L-HPC having a hydroxypropoxy group content of 5 to 16% by mass with a sieving shaker with horizontal movement of a sieve surface to obtain first sieve-residual L-HPC and first sieve-passed L-HPC, a second sieving step of sieving the first sieve-residual L-HPC with a sieving shaker with vertical movement of a sieve surface to obtain second sieve-residual L-HPC and second sieve-passed L-HPC, and a step of combining the first sieve-passed L-HPC and the second sieve-residual L-HPC to obtain the sieved L-HPC.
    Type: Grant
    Filed: August 24, 2020
    Date of Patent: August 23, 2022
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kentaro Miki, Akiko Tsuchida, Akira Kitamura, Yasuyuki Hirama
  • Patent number: 11319385
    Abstract: There is provided a method for producing hypromellose acetate succinate (HPMCAS), the method not requiring any special device and facilitating removal of impurities. More specifically, there is provided a method for producing HPMCAS, including an esterification step of esterifying hypromellose with an acetylating agent and a succinoylating agent in the presence of an aliphatic carboxylic acid to obtain a reaction product solution containing HPMCAS; a precipitation step of precipitating the HPMCAS by mixing the reaction product solution with water to obtain a suspension of the precipitated HPMCAS; a neutralization step of neutralizing the suspension with a basic substance to obtain a neutralized suspension; and a washing step of washing the HPMCAS contained in the neutralized suspension to obtain the washed HPMCAS.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: May 3, 2022
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Taishi Kitaguchi, Akiko Tsuchida, Akira Kitamura, Mitsuo Narita
  • Patent number: 11319384
    Abstract: There is provided a method for producing hypromellose phthalate (HPMCP), the method not requiring any special device, and facilitating removal of impurities. More specifically, there is provided a method for producing HPMCP, including an esterification step of esterifying hypromellose with a carboxybenzoylating agent in the presence of an aliphatic carboxylic acid to obtain a reaction product solution containing HPMCP; a precipitation step of precipitating the HPMCP by mixing the reaction product solution with water to obtain a suspension of the precipitated HPMCP; a neutralization step of neutralizing the suspension with a basic substance to obtain a neutralized suspension; and a washing step of washing the HPMCP contained in the neutralized suspension to obtain the washed HPMCP.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: May 3, 2022
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Akiko Tsuchida, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
  • Publication number: 20210061926
    Abstract: There is provides a method for producing sieved low-substituted hydroxypropyl cellulose (L-HPC) at improved yield, while maintaining flowability and tablet properties. More specifically, there is provided a method for producing sieved L-HPC including a first sieving step of sieving L-HPC having a hydroxypropoxy group content of 5 to 16% by mass with a sieving shaker with horizontal movement of a sieve surface to obtain first sieve-residual L-HPC and first sieve-passed L-HPC, a second sieving step of sieving the first sieve-residual L-HPC with a sieving shaker with vertical movement of a sieve surface to obtain second sieve-residual L-HPC and second sieve-passed L-HPC, and a step of combining the first sieve-passed L-HPC and the second sieve-residual L-HPC to obtain the sieved L-HPC.
    Type: Application
    Filed: August 24, 2020
    Publication date: March 4, 2021
    Inventors: Kentaro Miki, Akiko Tsuchida, Akira Kitamura, Yasuyuki Hirama
  • Publication number: 20200031953
    Abstract: There is provided a method for producing hypromellose phthalate (HPMCP), the method not requiring any special device, and facilitating removal of impurities. More specifically, there is provided a method for producing HPMCP, including an esterification step of esterifying hypromellose with a carboxybenzoylating agent in the presence of an aliphatic carboxylic acid to obtain a reaction product solution containing HPMCP; a precipitation step of precipitating the HPMCP by mixing the reaction product solution with water to obtain a suspension of the precipitated HPMCP; a neutralization step of neutralizing the suspension with a basic substance to obtain a neutralized suspension; and a washing step of washing the HPMCP contained in the neutralized suspension to obtain the washed HPMCP.
    Type: Application
    Filed: July 24, 2019
    Publication date: January 30, 2020
    Inventors: Akiko Tsuchida, Taishi Kitaguchi, Akira Kitamura, Mitsuo Narita
  • Publication number: 20200031954
    Abstract: There is provided a method for producing hypromellose acetate succinate (HPMCAS), the method not requiring any special device and facilitating removal of impurities. More specifically, there is provided a method for producing HPMCAS, including an esterification step of esterifying hypromellose with an acetylating agent and a succinoylating agent in the presence of an aliphatic carboxylic acid to obtain a reaction product solution containing HPMCAS; a precipitation step of precipitating the HPMCAS by mixing the reaction product solution with water to obtain a suspension of the precipitated HPMCAS; a neutralization step of neutralizing the suspension with a basic substance to obtain a neutralized suspension; and a washing step of washing the HPMCAS contained in the neutralized suspension to obtain the washed HPMCAS.
    Type: Application
    Filed: July 24, 2019
    Publication date: January 30, 2020
    Inventors: Taishi Kitaguchi, Akiko Tsuchida, Akira Kitamura, Mitsuo Narita
  • Patent number: 8546465
    Abstract: An aqueous ink for an inkjet, comprising a pigment, a polymer compound that coats the pigment, a water-soluble organic solvent, and water, wherein the polymer compound has a ?-diketone group and a cationic salt-forming group, and also includes a cross-linked structure based on a siloxane linkage.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: October 1, 2013
    Assignee: Riso Kagaku Corporation
    Inventors: Tetsuo Nakamura, Akiko Tsuchida
  • Publication number: 20080293862
    Abstract: An aqueous ink for an inkjet, comprising a pigment, a polymer compound that coats the pigment, a water-soluble organic solvent, and water, wherein the polymer compound has a ?-diketone group and a cationic salt-forming group, and also includes a cross-linked structure based on a siloxane linkage.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 27, 2008
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Tetsuo Nakamura, Akiko Tsuchida