Patents by Inventor Akiko Doujo

Akiko Doujo 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).

  • Moistureproof paper having shading property and recyclability
    Patent number: 6117563
    Abstract: The object is to provide a moistureproof paper which is excellent in light-screening, moisture-proof, waterproof and heat-sealing properties and regeneration property at the time of reuse as a used paper, and in order to attain the object, a moisture-proof layer (3) of maceration, regeneration and heat-sealing properties is provided on the surface of a coated base (1) having a light-screening layer (2) of a hue of from 25 to 70 in terms of the luminosity index L* to obtain a moisture-proof paper having a light-screening and regeneration properties.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: September 12, 2000
    Assignees: Nippon Paper Industries Co., Ltd., Toyo Ink Manufacturing Co., Ltd., San-Mic Chiyoda Co., Ltd.
    Inventors: Mituyuki Watanabe, Akiko Doujo, Ryoji Ito, Tsutomu Fujigamori, Kiyotaka Kido, Yuji Otake