Patents by Inventor Akiko Iwasaki

Akiko Iwasaki 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).

  • Patent number: 5246906
    Abstract: A thermosensitive recording material capable of recording thereon colored images having high resistances to oily substances, plasticizers, moisture, and heat and an excellent storage persistency over a long time, comprises a thermosensitive colored image-forming layer formed on a sheet substrate and comprising a colorless dye precursor, a color developing agent, and a binder, the color developing agent comprising at least one compound of the formula (I): ##STR1## wherein X is an O or S atom, R.sup.1 is an unsaturated aromatic group or a substituted phenyl group having a lower alkyl or halogen atom and R.sup.2 and R.sup.3 are respectively a hydrogen atom, alkyl, aralkyl, substituted alkyl having an aryloxy, unsubstituted aromatic group, or substituted aromatic group having at least one substituent selected from alkyl, aryl, aralkyl, alkyloxy, alkyloxycarbonyl, aryloxycarbonyl, aralkyloxycarbonyl, and arylsulfonyl groups, and halogen atoms.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: September 21, 1993
    Assignee: Oji Paper Co., Ltd.
    Inventors: Yoshiyuki Takahashi, Akiko Iwasaki, Kunitaka Toyofuku
  • Patent number: 5008236
    Abstract: A heat-sensitive recording material with an excellent recording sensitivity and capable of recording thereon high quality images at a high recording speed, comprising a heat-sensitive color-forming layer formed on a substrate sheet and comprising a colorless dye precursor, a color-developing agent, a binder and a sensitizing agent consisting essentially of 1,2-diphenoxybenzene.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: April 16, 1991
    Assignee: Oji Paper Co., Ltd.
    Inventors: Yoshiyuki Takahashi, Kunitaka Toyofuku, Akiko Iwasaki
  • Patent number: 4956332
    Abstract: A heat-sensitive recording material with an excellent recording sensitivity, heat stability and resistance to the whitening phenomenon, comprising a heat-sensitive color developing layer formed on a substrate sheet and containing, in addition to a colorless dye precursor, color developing agent and binder, a heat-fusible sensitizing agent consisting essentially of at least one member selected from 1,4-bis(p-tolyloxy)benzene, 1,4-bis(3', 4'-dimethylphenyloxy)benzene and 1,4-bis(3',5'-dimethylphenyloxy)benzene, in an amount of 10% to 1,000% based on the weight of the color developing agent.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: September 11, 1990
    Assignee: Oji Paper Co., Ltd.
    Inventors: Yoshiyuki Takahashi, Kunitaka Toyofuku, Akiko Iwasaki