Patents by Inventor Akira Saka

Akira Saka 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 resinous materials containing stilbazolium groups
    Patent number: 4339524
    Abstract: A partially saponified polyvinyl acetate having at least one stilbazolium group-containing photosensitive unit represented by the following general formula: ##STR1## (wherein R.sub.1 is hydrogen atom, an unsubstituted or substituted alkyl group, an alkenyl group or an aralkyl group, R.sub.2 is hydrogen atom or an unsubstituted or substituted alkyl group, Y is a conjugated base of an inorganic or organic acid, m is an integer of 1 to 6, and n is 0 or 1) and an acetal unit represented by the following general formula: ##STR2## (wherein R.sub.3 is hydrogen atom or an alkyl group); the acetal units being contained therein in an amount of approximately 0.5 to 10.0 mol % with respect to mole of the polyvinylalcohol units thereof; the stilbazolium group-containing units being contained therein in an amount of approximately 0.5 to 5.
    Type: Grant
    Filed: April 14, 1981
    Date of Patent: July 13, 1982
    Assignees: Agency of Industrial Science & Technology Ministry of International Trade and Industry, Sony Corporation, Oji Paper Co., Ltd.
    Inventors: Kunihiro Ichimura, Osamu Takeuchi, Hideo Kusama, Kazuo Yamazaki, Akira Saka, Hiroshi Ito, Kunitaka Toyofuku