Patents by Inventor George H. Tang

George H. Tang 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).

  • Throat height control during lapping of magnetic heads
    Patent number: 5214589
    Abstract: During a lapping operation to obtain an optimum throat height for a thin film magnetic head, an M-H looper circuit is coupled directly to the head coil for measuring the magnetization and saturation current of the head in response to a given drive current. An amplitude modulated analog output signal is digitized and the resultant digital number is compared to stored data signals which are representative of optimum throat heights for the design of the head being lapped. The lapping operation is controlled in response to the difference signals obtained by the comparison.
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: May 25, 1993
    Assignee: Read-Rite Corp.
    Inventor: George H. Tang