Patents by Inventor Choichiro Tanigawa

Choichiro Tanigawa 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).

  • Single component toner comprising specified polyester
    Patent number: 5958641
    Abstract: This invention relates to a single component toner comprising specified polyester resins as binder resin and used in single-component developing system in which toner particles are electrically charged when passing through the opening between a toner-levelling member and a toner-transporting member positioned against a photosensitive member.
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: September 28, 1999
    Assignee: Minolta Co., Ltd.
    Inventors: Tetsuo Sano, Hiroyuki Fukuda, Chikara Tsutsui, Choichiro Tanigawa, Senyu Taira, Mikihiko Sukeno
  • Air classifier with specified truncated cone-like breather pipe
    Patent number: 5921481
    Abstract: An air classifying system that can produce toner particles having a desired particle size is disclosed. The air classifying system contains a supplying pipe for supplying raw materials; a truncated cone-like breather pipe that has a ratio of minimal opening sectional area S.sub.1 to a maximum opening sectional area S.sub.0 being between 0.2 and 0.5, and an angle .theta. formed between axis and generatrix being between 10.degree. and 35.degree.; a classifying means for classifying the raw materials supplied through the supplying pipe; and an air flow-generating means for generating air-flow for transporting the raw materials in the classifying system.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: July 13, 1999
    Assignee: Minolta Co., Ltd.
    Inventors: Akihiro Nakamura, Choichiro Tanigawa, Yutaka Tsujishita, Yasunori Sakuda