Patents by Inventor Haruo Togawa

Haruo Togawa 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).

  • Ion-exchangeable and solvent-resistant filamentary structure containing sulfone cross-linked aromatic units
    Patent number: 3972840
    Abstract: A solvent-resistant filamentary structure having superior ion-exchangeability which comprises at least 20% by weight of aromatic nuclear structural units derived from an aromatic monovinyl monomer, 2 to 40 out of 100 of said aromatic nuclear structural units being cross-linked by crosslinkages of the formula ##EQU1## said filamentary structure not containing a crosslinkage expressed by the formula ##EQU2## and the remainder of said aromatic nuclear structural units, either partly or wholly, having incorporated therein an ion-exchangeable group, and a method for producing the same.
    Type: Grant
    Filed: December 9, 1974
    Date of Patent: August 3, 1976
    Assignee: Teijin Limited
    Inventors: Hideaki Suzuki, Haruo Togawa, Akira Omori, Naoki Yamamoto