Patents by Inventor Charles R. Masud

Charles R. Masud 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: 4878290
    Abstract: A method for making a thin film magnetic head in which the pole tips are trimmed to a predetermined width prior to the completion of the magnetic yoke structure. The thin film magnetic head is produced through deposition of the first magnetic layer in two stages, through deposition of the coil, the insulating material for the coil and through deposition of the second magnetic layer. The thin film head is then masked by a photoresist mask having openings to expose specific parts of the pole tip region, and an ion milling operation is used to etch the head assembly to form pole tips having a predetermined width. The shaping layer for the second magnetic layer is then deposited to complete the magnetic yoke structure.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: November 7, 1989
    Assignee: International Business Machines Corporation
    Inventors: Charles R. Masud, Cheng-Teh Wu