Patents by Inventor Mitsuo Niwa

Mitsuo Niwa 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).

  • Production unit of long-term preservable lunch and lunch box used for said lunch
    Patent number: 5697203
    Abstract: In accordance with the present invention, there can be mass produced long-term preservable lunches in a short period of time, because a series of such operations as formation, cleaning, sterilizing, dishing-up, sealing and filling the lunch box with an inert gas are carried out consistently by virtue of the production unit of lunches of the present invention. Further, because the lunches are allowed to pass through successively the gas chambers filled with the inert gas, no insufficient filling of the lunches with the inert gas will occur. Further, the lunch boxes can individually be filled with the inert gas when each lunch box is provided with a sealing valve and filled with the inert gas by inserting an inert gas filling tube into said lunch box through the sealing valve.
    Type: Grant
    Filed: January 20, 1994
    Date of Patent: December 16, 1997
    Assignee: Hachiku Shoji Kabushikikaisha
    Inventor: Mitsuo Niwa