Patents by Inventor Eigi Matsubara

Eigi Matsubara 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).

  • Silver halide photographic emulsion
    Patent number: 4818676
    Abstract: Disclosed is a silver halide photographic emulsion supersensitized with at least two sensitizing dyes selected from those represented by the following general formula [I], [II] and [III]:General formula [I]: ##STR1## wherein R.sub.1 represents an unsubstituted or substituted alkyl group, R.sub.2 represents a sulfoalkyl group or a sulfoaralkyl group, and R.sub.3 represents an alkyl group, and W.sub.1 and W.sub.2 represent each an alkylene group;General formula [II]: ##STR2## wherein W.sub.3 to W.sub.6 represent each an alkyl group, an alkoxy group, or hydroxyl group, R.sub.4 represents an unsubstituted or substituted alkyl group, R.sub.5 represents a sulfoalkyl group or a sulfoaralkyl group, and R.sub.6 represents an alkyl group;General formula [III]: ##STR3## wherein R.sub.7 represents an unsubstituted or substituted alkyl group, R.sub.8 represents a sulfoalkyl group or a sulfoaralkyl group, R.sub.9 represents an alkyl group, and W.sub.7 and W.sub.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: April 4, 1989
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Susumu Baba, Eigi Matsubara, Katsuaki Iwaosa, Akira Tanaka