Patents by Inventor Tung-Hao Chen

Tung-Hao Chen 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).

  • Leakproof needle cover structure improvement
    Publication number: 20050277892
    Abstract: The present invention is a leakproof needle cover structure improvement. It relates to a safety hypodermic syringe with the needle and the needle holder retractable to the syringe, in which the needle cover has a cap at its end part, and leakage-proof ring is formed around the inside of the cap, such that when the needle cover sheathing on the needle retracts, the cap will simultaneously cover the aperture of the barrel, thus effectively prevent the leakage of residual medicament kept in the barrel.
    Type: Application
    Filed: June 9, 2004
    Publication date: December 15, 2005
    Applicant: Feng-Chi Tsao
    Inventor: Tung-Hao Chen