Patents by Inventor Toshihiko Matuura

Toshihiko Matuura 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 electrophotographic process containing chromium complex salts
    Patent number: 4824751
    Abstract: A toner for an electrophotographic process which comprises a complex salt compound represented by the following formula (1) ##STR1## wherein X represents Cl, Br, So.sub.2 NH.sub.2, So.sub.2 CH.sub.3 or So.sub.2 C.sub.2 H.sub.5 and A.sym. represents an alkenyl or alkylammonium ion of 17-28 carbon atoms. The complex salt compound of the formula (1) acts as a negative charge control agent in the toner and is good in compatibility with a binder and the toner prepared using it is excellent in specific chargeability and durability of charge.
    Type: Grant
    Filed: July 30, 1987
    Date of Patent: April 25, 1989
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Toshihiko Matuura, Kenzi Sawaki, Seizin Shindo, Michiko Torigoe