Patents by Inventor Fumiko Nakazawa

Fumiko Nakazawa 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).

  • Toners for developing electrostatically charged images
    Patent number: 5824446
    Abstract: The present invention relates to toners for developing electrostatically charged images which contains polyethylene fine particles and polypropylene fine particles as wax, which have a specific particle size. By incorporating such polyethylene and polypropylene fine particles into toners the prevention of smear, offset, filming, and improvement of fluidity and chargeability of the toners can be achieved.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: October 20, 1998
    Assignee: Minolta Co., Ltd.
    Inventors: Yoshikazu Nishihara, Ichiro Demizu, Yoshihiro Mikuriya, Fumiko Nakazawa, Hiroshi Fukao
  • Toner for two-component developing agent
    Patent number: 5807653
    Abstract: A toner for two-component developing agent is provided which can prevent smearing and offsetting during copying operation, and which is not liable to fluidity decrease and chargeability deterioration. The toner contains polyethylene and polypropylene as toner waxes and incorporates a magnetic powder having a certain BET specific surface area.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: September 15, 1998
    Assignee: Minolta Co., Ltd.
    Inventors: Yoshikazu Nishihara, Ichiro Demizu, Yoshihiro Mikuriya, Fumiko Nakazawa, Hiroshi Fukao