Patents by Inventor Jo Itakura

Jo Itakura 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).

  • Additive composition for use in papermaking
    Patent number: 4147682
    Abstract: An additive composition for use in papermaking comprises a water-soluble polymer having in its molecule --COOH groups and/or --SO.sub.3 H groups, polyaluminum chloride and an aqueous solvent. Because of formation of a kind of crosslinking structure between the water-soluble polymer molecules through the polyaluminum chloride, the above composition exerts an effect of enhancing the paper strength when used alone and an effect of enhancing both the sizing effect and the paper strength when used together with a sizing agent. The composition further increases the paper strength when used in combination with a conventional paper-strength improver.
    Type: Grant
    Filed: December 7, 1977
    Date of Patent: April 3, 1979
    Assignees: Toagosei Chemical Industry Co., Ltd., Osakagodo Company Ltd.
    Inventors: Akira Yada, Isamu Iijima, Jo Itakura, Saburo Fujikura