Patents by Inventor James Tze-Hwa Tung

James Tze-Hwa Tung 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).

  • Tester with virtual ground
    Patent number: 8004782
    Abstract: A tester system includes a tester and a radioactive isotope source. The tester includes a spindle assembly, a disk mounted to the spindle assembly, and a head actuatable over the disk. The radioactive isotope source is positioned in an ionizing location proximate the tester, such that a minimum distance between the radioactive isotope source and an axis of rotation of the disk is less than a radius of the disk.
    Type: Grant
    Filed: March 19, 2009
    Date of Patent: August 23, 2011
    Assignee: Western Digital Technologies, Inc.
    Inventors: Michael Nojaba, Pradeep K. Thayamballi, James Tze-Hwa Tung, Julius A. Turangan