Patents by Inventor Tatsumi Shiozawa

Tatsumi Shiozawa 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).

  • Oxygen gas cartridge
    Patent number: 5100014
    Abstract: An oxygen gas cartridge which hardly leaks or explodes, comprising an inner sealing plate attached to a main body thereof by calking and an outer sealing plate welded to the main body by laser beams at the outside of the inner sealing plate. As inner pressure of the cartridge increases abnormally, the inner sealing plate will curve into a space between both sealing plates to be broken first, and then the outer sealing plate will be broken next.
    Type: Grant
    Filed: August 7, 1990
    Date of Patent: March 31, 1992
    Assignee: Nippon Tansan Gas Company Limited
    Inventor: Tatsumi Shiozawa