Patents by Inventor Kazumasa Yazu

Kazumasa Yazu 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).

  • Process for the recovery of aromatic nitrogen-containing compounds
    Patent number: 5002655
    Abstract: A process for the recovery of aromatic nitrogen-containing compounds from an oily substance is disclosed which comprises extracting an oily substance containing aromatic nitrogen-containing compounds with a solvent containing water and a lower alkanol.
    Type: Grant
    Filed: March 15, 1989
    Date of Patent: March 26, 1991
    Assignee: Director-General of Agency of Industrial Science and Technology
    Inventors: Koji Ukegawa, Teruo Kondo, Akimitsu Matsumura, Kazumasa Yazu
  • Fine particles of ferromagnetic metal and process for producing the same
    Patent number: 4501610
    Abstract: Improved acicular fine particles of ferromagnetic metal having superior powder characteristics and tape characteristics are provided, which fine particles are prepared by adding to an aqueous suspension of acicular iron oxide or oxyhydroxide, a solution of a different kind and non-alkali metal salt of an organic acid in place of conventional inorganic acids, followed by making the mixture basic and heat reduction.
    Type: Grant
    Filed: February 23, 1984
    Date of Patent: February 26, 1985
    Assignee: Chisso Corporation
    Inventors: Kazumasa Yazu, Yasuto Adachi, Takayoshi Yoshizaki