Patents by Inventor Ching Tsoi

Ching Tsoi 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).

  • Magnetic recording medium having novel underlayer structure
    Patent number: 7179549
    Abstract: A magnetic recording medium constructed in accordance with the invention comprises a substrate, first, second and third underlayers formed over the substrate, and a magnetic data recording layer formed over the underlayers. The underlayers typically have a bcc crystal structure, and comprise Cr or Cr alloys. The magnetic data recording layer has a hcp crystal structure and comprises a Co alloy. The second underlayer typically comprises a material such as B, which tends to reduce the crystal size of the second underlayer and the layers deposited thereon, and also to increase crystal spacing.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: February 20, 2007
    Assignee: Komag, Inc.
    Inventors: Sudhir S. Malhotra, Gerardo Bertero, Ching Tsoi, Donald Stafford
  • Magnetic recording medium having novel underlayer structure
    Publication number: 20050158588
    Abstract: A magnetic recording medium constructed in accordance with the invention comprises a substrate, first, second and third underlayers formed over the substrate, and a magnetic data recording layer formed over the underlayers. The underlayers typically have a bcc crystal structure, and comprise Cr or Cr alloys. The magnetic data recording layer has a hcp crystal structure and comprises a Co alloy. The second underlayer typically comprises a material such as B, which tends to reduce the crystal size of the second underlayer and the layers deposited thereon, and also to increase crystal spacing.
    Type: Application
    Filed: January 21, 2004
    Publication date: July 21, 2005
    Inventors: Sudhir Malhotra, Gerardo Bertero, Ching Tsoi, Donald Stafford