Patents by Inventor Lein-Chang Wang

Lein-Chang Wang 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).

  • Patent number: 6032353
    Abstract: A magnetic head includes pole tips with aligned sidewalls and a low head profile. The aligned sidewalls are formed by depositing a stack of pole tip layers on a substrate. The stack of layers are etched through a common overlying mask. The stack of layers is covered over and around with a protective layer which is then planarized such that the stack of layers is exposed. The protective layer is etched to a predetermined thickness above the substrate, which is thinner than the thickness of the stack of layers. An inductive coil layer is deposited on the etched protective layer and covered with an overlying magnetic yoke layer which is dielectrically separated from the coil layer. The yoke layer thus formed assumes a low profile curvature due to the thin structure of the protective layer on the substrate.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: March 7, 2000
    Assignee: Read-Rite Corporation
    Inventors: Hugh C. Hiner, Billy Wayne Crue, William D. Jensen, Lein-Chang Wang, Durga P. Ravipati