Patents by Inventor Osamu Ezawa

Osamu Ezawa 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).

  • Process for forming magenta dye images
    Patent number: 4189321
    Abstract: A process for forming color photographic images using magenta couplers which afford excellent resistance to formalin, is described.
    Type: Grant
    Filed: August 24, 1978
    Date of Patent: February 19, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Tamotsu Kojima, Mitsuto Fujiwhara, Takaya Endo, Osamu Ezawa