Patents by Inventor John Ko-Chen Chen

John Ko-Chen Chen 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).

  • Thin film magnetic alloy having low noise, high coercivity and high squareness
    Patent number: RE37748
    Abstract: A Co-Pt based magnetic alloy which has been doped with a relatively high amount of nitrogen, e.g., or above 1 at. % is obtained having high coercivity, for example in the range of 1400 Oe or above, and an increased signal-to-noise ratio as compared to the same Co-Pt based alloy which has not been doped with nitrogen. The alloy is vacuum deposited, for example, by sputtering, and the nitrogen may be introduced from the sputtering gas or from the sputtering target.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: June 18, 2002
    Assignee: Komag, Inc.
    Inventors: Tu Chen, Tsutomu Tom Yamashita, Rajiv Yadav Ranjan, John Ko-Chen Chen, Keith Kadokura, Ting Joseph Yuen
  • Thin film magnetic alloy having low noise, high coercivity and high squareness
    Patent number: RE38544
    Abstract: A Co-Pt based magnetic alloy which has been doped with a relatively high amount of nitrogen, e.g., or above 1 at. % is obtained having high coercivity, for example in the range of 1400 Oe or above, and an increased signal-to-noise ratio as compared to the same Co-Pt based alloy which has not been doped with nitrogen. The alloy is vacuum deposited, for example, by sputtering, and the nitrogen may be introduced from the sputtering gas or from the sputtering target. Other low-solubility elements providing the grain uniformity and isolation include: B, P, S, C, Si, As, Se and Te.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: July 6, 2004
    Assignee: Komag, Inc.
    Inventors: Tu Chen, Tsutomu Tom Yamashita, Rajiv Yadav Ranjan, John Ko-Chen Chen, Keith Kadokura, Ting Joseph Yuen