Patents by Inventor Liji Guan

Liji Guan 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).

  • Fully shielded perpendicular recoding writer
    Patent number: 7042682
    Abstract: Conventional perpendicular writers that utilize an extended return pole are subject to large flux leakage. This problem has been reduced in the prior art by adding a downstream shield. This still leaves significant upstream leakage. This has now been eliminated by adding an upstream shield and then connecting the up and downstream shields by using side shields. The latter need not extend all the way from the downstream to the upstream shield in which case their thickness is increased relative to the full side shields.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: May 9, 2006
    Assignee: Headway Technologies, Inc.
    Inventors: Hung Liang Hu, Yaw Shing Tang, Liji Guan, Kochan Ju