Patents Assigned to Kazuyuki Sigita
  • Photo-removable electrophotographic toners using phenyl isopropenyl ketone
    Patent number: 5705304
    Abstract: Electrophotographic toners comprising a resin, a colorant, a charge controlling agent and an offset preventing agent. The resin comprises a copolymer containing at least one of phenyl isopropenyl ketone and its derivatives as a constituting monomer. The copolymer is photodegradable and thus the toners can be are used for recycling paper.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: January 6, 1998
    Assignees: Toyo Ink Manufacturing Co., Ltd., Kazuyuki Sigita
    Inventors: Kazuyuki Sugita, Ken-ichi Kishi, Hirofumi Iemura