Patents by Inventor Stella Tan

Stella Tan 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).

  • Multi-phase carbon overcoats for magnetic discs
    Patent number: 5945191
    Abstract: A magnetic disc for use in a magnetic disc drive is provided. The magnetic disc includes a recording surface wherein the recording surface includes a dual phase carbon overcoat. The dual phase carbon overcoat includes an amorphous carbon film sputtered on a magnetic layer. A doped amorphous carbon film is sputtered on the amorphous carbon film. The dual phase carbon overcoat has demonstrated improved hardness, reduced stiction and superior corrosion resistance over the prior art. A method of manufacturing the magnetic disc is also provided. The method includes providing a sputtering apparatus having a process chamber, providing a partially manufactured magnetic disc having a magnetic layer thereon, placing the partially manufactured magnetic disc within the process chamber, sputtering an amorphous carbon film on the magnetic layer, and sputtering a doped amorphous carbon film on the amorphous carbon film.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: August 31, 1999
    Assignee: Seagate Technology, Inc.
    Inventors: Kuo-Hsing Hwang, Xiaohua Chen, Alexander Boris Khazanov, Abdellah Hafid, Stella Tan, Quy Cuu Nguyen
  • Multi-phase overcoats for magnetic discs
    Patent number: 5785825
    Abstract: A magnetic disc for use in a magnetic disc drive is provided. The magnetic disc includes a recording surface wherein the recording surface includes a dual phase carbon overcoat. The dual phase carbon overcoat includes an amorphous carbon film sputtered on a magnetic layer. A doped amorphous carbon film is sputtered on the amorphous carbon film. The dual phase carbon overcoat has demonstrated improved hardness, reduced stiction and superior corrosion resistance over the prior art. A method of manufacturing the magnetic disc is also provided. The method includes providing a sputtering apparatus having a process chamber, providing a partially manufactured magnetic disc having a magnetic layer thereon, placing the partially manufactured magnetic disc within the process chamber, sputtering an amorphous carbon film on the magnetic layer, and sputtering a doped amorphous carbon film on the amorphous carbon film.
    Type: Grant
    Filed: October 2, 1995
    Date of Patent: July 28, 1998
    Assignee: Seagate Technology, Inc.
    Inventors: Kuo-Hsing Hwang, Xiaohua Chen, Alexander Boris Khazanov, Abdellah Hafid, Stella Tan, Quy Cuu Nguyen