Patents by Inventor Naohita Naraoka

Naohita Naraoka 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).

  • Packing bag for light sensitive materials and manufacturing method therfore
    Patent number: 5540644
    Abstract: A bag for packing a light-sensitive material is disclosed. The bag has an outermost surface and an innermost surface and is essentially consisting of a material for making the bag which comprises not less than 70% by weight of polyethylene and 1 to 10% by weight of a light shielding material based on the weight of the material, in which a Vicat softening point of the outermost surface is higher by not less than 20.degree. C. than a Vicat softening point of the inner most surface. Further a method for producing a bag is disclosed.
    Type: Grant
    Filed: October 6, 1992
    Date of Patent: July 30, 1996
    Assignee: Konica Corporation
    Inventors: Naohita Naraoka, Junichi Tamura