Patents by Inventor Kikuko Okamura

Kikuko Okamura 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 and compounds useful for the toner
    Patent number: 4780553
    Abstract: A compound having the formula: ##STR1## wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a hydrogen atom, an alkyl group having from 1 to 22 carbon atoms, an unsubstituted or substituted aromatic group having from 6 to 20 carbon atoms and an aralkyl group having from 7 to 20 carbon atoms, and A.sup..crclbar. is a molybdic acid anion, a tungstic acid anion or a heteropolyacid anion containing molybdenum or tungsten atoms.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: October 25, 1988
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Nobuo Suzuki, Kikuko Okamura, Genpei Sugiyama, Susumu Suzuka
  • Electrophotographic toner containing metal complex charge control agent
    Patent number: 4683188
    Abstract: A compound having the formula: ##STR1## wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a hydrogen atom, an alkyl group having from 1 to 22 carbon atoms, an unsubstituted or substituted aromatic group having from 6 to 20 carbon atoms and an aralkyl group having from 7 to 20 carbon atoms, and A.sup..crclbar. is a molybdic acid anion, a tungstic acid anion or a heteropolyacid anion containing molybdenum or tungsten atoms.
    Type: Grant
    Filed: May 14, 1986
    Date of Patent: July 28, 1987
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Nobuo Suzuki, Kikuko Okamura, Genpei Sugiyama, Susumu Suzuka