Patents by Inventor Ritsuko WAKAYAMA

Ritsuko WAKAYAMA 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).

  • GUARD COLUMN AND METHOD FOR PRODUCING GUARD COLUMN
    Publication number: 20220023832
    Abstract: Provided is a guard column including a filling part having a length of 2.0 cm to 3.5 cm formed of a filler, in which the filler is made of porous silica gel having a hydrophilized surface and an average particle size of 1.5 ?m to 2.5 ?m, and a pressure difference when an aqueous solution is fed at a linear flow rate of 2.1 cm/min is 4.0 MPa or more.
    Type: Application
    Filed: November 11, 2019
    Publication date: January 27, 2022
    Applicant: SHOWA DENKO K.K.
    Inventors: Hirotsugu NAKANISHI, Ritsuko WAKAYAMA