Patents by Inventor Tetsuya HAMASAKI

Tetsuya HAMASAKI 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).

  • Porous membrane
    Patent number: 11338248
    Abstract: The object of the present invention is to provide a porous membrane by which a useful component can be recovered while suppressing the clogging during filtration of a protein solution and from which only a small amount of an eluate is eluted even when an aqueous solution is filtered. The present invention provides a porous membrane containing a hydrophobic polymer and a water-insoluble hydrophilic polymer, the porous membrane having a dense layer in the downstream portion of filtration in the membrane, having a gradient asymmetric structure in which the average pore diameter of fine pores increases from the downstream portion of filtration toward the upstream portion of filtration, and having a gradient index of the average pore diameter from the dense layer to the coarse layer of 0.5 to 12.0.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: May 24, 2022
    Assignee: ASAHI KASEI MEDICAL CO., LTD.
    Inventors: Yuzo Kayama, Masayasu Komuro, Tetsuya Hamasaki
  • POROUS MEMBRANE
    Publication number: 20210197133
    Abstract: A porous membrane containing a hydrophobic polymer and a water-insoluble hydrophilic polymer, the porous membrane having a dense layer in the downstream portion of filtration in the membrane, having a gradient asymmetric structure in which the average pore diameter of fine pores increases from the downstream portion of filtration toward the upstream portion of filtration, and having a gradient index of the average pore diameter from the dense layer to the coarse layer of 0.5 to 12.0.
    Type: Application
    Filed: March 17, 2021
    Publication date: July 1, 2021
    Applicant: ASAHI KASEI MEDICAL CO., LTD.
    Inventors: Yuzo KAYAMA, Masayasu KOMURO, Tetsuya HAMASAKI
  • POROUS MEMBRANE
    Publication number: 20170266626
    Abstract: The object of the present invention is to provide a porous membrane by which a useful component can be recovered while suppressing the clogging during filtration of a protein solution and from which only a small amount of an eluate is eluted even when an aqueous solution is filtered. The present invention provides a porous membrane containing a hydrophobic polymer and a water-insoluble hydrophilic polymer, the porous membrane having a dense layer in the downstream portion of filtration in the membrane, having a gradient asymmetric structure in which the average pore diameter of fine pores increases from the downstream portion of filtration toward the upstream portion of filtration, and having a gradient index of the average pore diameter from the dense layer to the coarse layer of 0.5 to 12.0.
    Type: Application
    Filed: August 25, 2015
    Publication date: September 21, 2017
    Applicant: ASAHI KASEI MEDICAL CO., LTD.
    Inventors: Yuzo KAYAMA, Masayasu KOMURO, Tetsuya HAMASAKI