Patents by Inventor Long H. Chen

Long H. 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).

  • Hypodermic syringe with a safe needle cap
    Patent number: 5582594
    Abstract: A hypodermic syringe wherein the neck of the barrel has a toothed portion raised around an inside wall thereof for passing the needle cannula and sloping in one direction; the needle cap has a plurality of toothed portions spaced around the periphery at different elevations and respectively sloping in one direction; the toothed portions of the needle cap are forced into engagement with the toothed portion of the neck of the barrel and stopped by it from backward movement when the needle cap is invertedly inserted into the neck of the barrel to seal the used needle cannula inside the barrel.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: December 10, 1996
    Inventor: Long H. Chen