Patents by Inventor Chen Chien-Chich

Chen Chien-Chich 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).

  • Screwdriver with control portion for selectively retaining tips therein
    Patent number: 6223633
    Abstract: A screwdriver having a handle and a tip detachably fastened to the handle. The handle has a control portion provided with a receiving hole in which the tip is releaseably retained by two retaining members in conjunction with a position confining block. A cover is fitted onto the end of the handle such that the tip extends through a through hole formed at a closed end of the cover. The position confining block extends partially outwardly through a through hole formed in a side wall of the cover.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: May 1, 2001
    Inventor: Chen Chien-Chich