Patents by Inventor Zene Kumagai

Zene Kumagai 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: 4263397
    Abstract: A photographic product comprising, in a package, a light-sensitive silver halide photographic material having a silver halide emulsion layer coated on a support, characterized in that said silver halide emulsion layer contains a sensitizing or desensitizing dye and that the oxygen permeability of the package is below 5.times.10.sup.2 cc/m.sup.2. 24 hrs. atm. under a condition at 20.degree. C. and 0% of relative humidity and further that the sealed package is under a condition that a partial pressure of an oxygen-gas in the package is not more than 1/6 atmospheres at an initial stage.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: April 21, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Akira Horikoshi, Zene Kumagai