Patents by Inventor Yukinao Yagi

Yukinao Yagi 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).

  • Patent number: 4440016
    Abstract: A method for high speed leak test for a metallic cover with a pull tab. When one wants to test whether a metallic cover with an opening-defining score line and a pull tab for breaking off a part of the cover defined by the score line has a leak, the cover is put in a closed chamber. The closed chamber is divided into an upper closed portion in which the tab is present and a lower closed portion in which the tab is absent, thereby making the cover the boundary. Pressurized air is then injected into the upper closed portion to test whether the cover has a leak by measuring the change in the air pressure within the lower closed portion.
    Type: Grant
    Filed: December 30, 1981
    Date of Patent: April 3, 1984
    Assignee: Daiwa Can Company, Limited
    Inventors: Takeshi Konagaya, Yukinao Yagi