Patents by Inventor Toshinori Kamisaka

Toshinori Kamisaka 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).

  • Method for manufacturing lepidocrocite
    Patent number: 4748017
    Abstract: Lepidocrocite suitable for obtaining excellent magnetic powders and magnetic recording media is manufactured by oxidizing an aqueous suspension of ferrous hydroxide obtained from a ferrous salt and an alkali by blowing an amount of an oxygen-containing gas into the suspension, in which the blowing amount of the oxygen-containing gas is appropriately controlled in three steps, according to three steps of the oxidation reaction of the ferrous hydroxide. In a preferred embodiment, average oxygen absorption rates in the three oxidization steps are defined and the blowing of the oxygen-containing gas is controlled thereby.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: May 31, 1988
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Yasushi Matsui, Toshinori Kamisaka, Takahiko Goto, Kenichi Okazaki, Norio Koike