Patents by Inventor Hirosi Itoh

Hirosi Itoh 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).

  • Photosensitive composition of aromatic azido compound
    Patent number: 4148655
    Abstract: Disclosed is an alkali-soluble photosensitive composition having an excellent stability in photosensitivity and developing property over a long storage time and a high ink-sensitivity. The composition comprises an aromatic azido compound and a novolak resin prepared by condensation polymerizing, in the presence of an acid catalyst, formaldehyde, a phenol compound of the following formula (I) and another phenol compound or compounds of the following formula (II) and/or formula (III). ##STR1## wherein, R.sub.1 =H or -CH.sub.3, R.sub.2 =alkyl of 3-15 carbon atoms, phenyl or cyclohexyl, and R.sub.3 and R.sub.4 =alkyl of 1-3 carbon atoms.
    Type: Grant
    Filed: December 16, 1977
    Date of Patent: April 10, 1979
    Assignee: Oji Paper Co., Ltd.
    Inventors: Hirosi Itoh, Yukinori Hata, Fumio Itoh