Patents by Inventor Naohiro OYAMADA

Naohiro OYAMADA 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).

  • Cellulose acetate and method for producing cellulose acetate
    Patent number: 11066484
    Abstract: Provided is cellulose acetate with which a hollow fiber membrane having excellent salt rejection and water permeability can be produced. The cellulose acetate, in which a total content of calcium and magnesium is 2.8 to 3.5 ?mol/g; a 6 percent viscosity is 40 to 80 mPa·s; a degree of filtration Kw is 35 g?1 or less; a molecular weight distribution Mw/Mn is 3.00 or less; and a degree of acetylation is 61.3 to 62.3%.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: July 20, 2021
    Assignee: DAICEL CORPORATION
    Inventors: Naohiro Oyamada, Akihiro Higuchi
  • CELLULOSE ACETATE AND METHOD FOR PRODUCING CELLULOSE ACETATE
    Publication number: 20200262933
    Abstract: Provided is cellulose acetate with which a hollow fiber membrane having excellent salt rejection and water permeability can be produced. The cellulose acetate, in which a total content of calcium and magnesium is 2.8 to 3.5 ?mol/g; a 6 percent viscosity is 40 to 80 mPa?s; a degree of filtration Kw is 35 g?1 or less; a molecular weight distribution Mw/Mn is 3.00 or less; and a degree of acetylation is 61.3 to 62.3%.
    Type: Application
    Filed: January 12, 2016
    Publication date: August 20, 2020
    Applicant: DAICEL CORPORATION
    Inventors: Naohiro OYAMADA, Akihiro HIGUCHI