Patents by Inventor Hiroshi Taniwaki

Hiroshi Taniwaki 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).

  • Electrophotographic toner for high speed electrophotography
    Patent number: 4857433
    Abstract: An electrophotographic toner, which can exhibit good fixation in high-speed copying and is not affected by an environment such as high humidity, is provided by containing, as a principal component thereof, a resin blend composed of (a) 40-90 wt. % of a vinyl copolymer (I) formed of 70-97 wt. % of an aromatic vinyl monomer, 3-30 wt. % of an alkyl fumarate which is an C.sub.1-8 monoalkyl or dialkyl ester and 0-5 wt. % of an acid monomer and having a number average molecular weight of 2,000-15,000 and (b) 10-60 wt. % of a vinyl polymer (II) having a number average molecular weight of 20,000-500,000.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: August 15, 1989
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Masaaki Shin, Akio Fujiwara, Hiroshi Taniwaki
  • Electrophotographic process uses toner comprising vinyl copolymer
    Patent number: 4727010
    Abstract: An electrophotographic toner, which can exhibit good fixation in high-speed copying and is not affected by an environment such as high humidity, is provided by containing, as a principal component thereof, a resin blend composed of (a) 40-90 wt. % of a vinyl copolymer (I) formed of 70-97 wt. % of an aromatic vinyl monomer, 3-30 wt. % of an alkyl fumarate which is a C.sub.1-8 monoalkyl or dialkyl ester and 0-5 wt. % of an acid monomer and having a number average molecular weight of 2,000-15,000 and (b) 10-60 wt. % of a vinyl polymer (II) having a number average molecular weight of 20,000-500,000.
    Type: Grant
    Filed: July 31, 1986
    Date of Patent: February 23, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Masaaki Shin, Akio Fujiwara, Hiroshi Taniwaki