Patents by Inventor Daisaburo Azuma

Daisaburo Azuma 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).

  • Nib for writing instruments
    Patent number: 4208145
    Abstract: A planar type nib for writing instruments comprises a plurality of capillary ink feeding channels throughout the entire length of the nib. A split is formed at a tip portion of the nib so that the independent capillary ink feeding channels may be connected to one another at the tip portion of the nib when a writing pressure is applied to the nib.
    Type: Grant
    Filed: December 8, 1978
    Date of Patent: June 17, 1980
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Daisaburo Azuma
  • Penpoint or similar article
    Patent number: D260533
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: September 1, 1981
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Daisaburo Azuma