Patents by Inventor Hui Ling Chen

Hui Ling 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).

  • Wrench capable of clamping a screwed member and preventing the screwed member from slipping out of a socket of the wrench and permitting the screwed member to pass through the socket
    Patent number: 6889581
    Abstract: A wrench including a stem having a head section at one end of the stem and a polygonal socket formed in the head section for fitting onto a screwed member. A resilient ring is disposed at the head section and pivotally connected with a controlling switch pivotally disposed at the head section. By means of operating the controlling switch, the resilient ring is driven to expand or close. In the closed position, the resilient ring obstructs at least one inner angle of the socket to prevent the screwed member from detaching out of the socket and clamp the screwed member in the socket. In the expanded position, the resilient ring frees the inner angle, permitting the screwed member to freely pass through the socket.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: May 10, 2005
    Inventor: Hui Ling Chen