Patents by Inventor Tamaki Kamimura

Tamaki Kamimura 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 producing a polarizing film
    Patent number: 4992218
    Abstract: A polarizing film comprising a polyvinyl alcohol-type film and a dichroic dye, a metallic ion and boric acid incorporated therein, and a process for producing the same, which comprises adsorbing a dichroic dye on a polyvinyl alcohol-type film, stretching the film substantially in one direction, immersing the stretched film in an aqueous solution containing a metallic ion and boric acid.
    Type: Grant
    Filed: June 7, 1988
    Date of Patent: February 12, 1991
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Akitoshi Sugio, Ryozo Kawai, Masaki Nagata, Tamaki Kamimura