Patents by Inventor Ching Jackie Tsoi

Ching Jackie 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 disk comprising a first carbon overcoat having a high SP3 content and a second carbon overcoat having a low SP3 content
    Patent number: 6855232
    Abstract: A method for making a magnetic disk comprises forming first and second protective carbon layers on a magnetic layer. The first protective carbon layer is predominantly SP3 carbon. The second protective carbon layer comprises about 50% or less SP3 carbon. The second protective carbon layer is very thin, e.g. between 0.1 and 1.0 nm thick. A lubricant layer (e.g. a perfluoropolyether lubricant) is applied to the second protective carbon layer. The second protective carbon layer facilitates improved cooperation between lubricant and the disk.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: February 15, 2005
    Assignee: Komag, Inc.
    Inventors: Bruce Jairson, Ching Jackie Tsoi, Wen Liu, Shigeto Hashimoto, Eric Woo Hock Yong, Tsutomu Tom Yamashita
  • Magnetic disk comprising a first carbon overcoat having a high SP3 content and a second carbon overcoat having a low SP3 content
    Publication number: 20040137207
    Abstract: A method for making a magnetic disk comprises forming first and second protective carbon layers on a magnetic layer. The first protective carbon layer is predominantly SP3 carbon. The second protective carbon layer comprises about 50% or less SP3 carbon. The second protective carbon layer is very thin, e.g. between 0.1 and 1.0 nm thick. A lubricant layer (e.g. a perfluoropolyether lubricant) is applied to the second protective carbon layer. The second protective carbon layer facilitates improved cooperation between lubricant and the disk.
    Type: Application
    Filed: December 5, 2003
    Publication date: July 15, 2004
    Inventors: Bruce Lairson, Ching Jackie Tsoi, Wen Liu, Shigeto Hashimoto, Eric Woo Hock Yong, Tsutomu Tom Yamashita
  • Magnetic disk comprising a first carbon overcoat having a high SP3 content and a second carbon overcoat having a low SP3 content
    Patent number: 6682807
    Abstract: A method for making a magnetic disk comprises forming first and second protective carbon layers on a magnetic layer. The first protective carbon layer is predominantly SP3 carbon. The second protective carbon layer comprises about 50% or less SP3 carbon. The second protective carbon layer is very thin, e.g. between 0.1 and 1.0 nm thick. A lubricant layer (e.g. a perfluoropolyether lubricant) is applied to the second protective carbon layer. The second protective carbon layer facilitates improved cooperation between lubricant and the disk.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: January 27, 2004
    Assignee: Komag, Inc.
    Inventors: Bruce Lairson, Ching Jackie Tsoi, Wen Liu, Shigeto Hashimoto, Eric Woo Hock Yong, Tsutomu Tom Yamashita
  • Magnetic disk comprising a first carbon overcoat having a high SP3 content and a second carbon overcoat having a low SP3 content
    Patent number: 6565719
    Abstract: A method for making a magnetic disk comprises forming first and second protective carbon layers on a magnetic layer. The first protective carbon layer is predominantly SP3 carbon. The second protective carbon layer comprises about 50% or less SP3 carbon. The second protective carbon layer is very thin, e.g. between 0.1 and 1.0 nm thick. A lubricant layer (e.g. a perfluoropolyether lubricant) is applied to the second protective carbon layer. The second protective carbon layer facilitates improved cooperation between lubricant and the disk.
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: May 20, 2003
    Assignee: Komag, Inc.
    Inventors: Bruce Lairson, Ching Jackie Tsoi, Wen Liu, Shigeto Hashimoto, Eric Woo Hock Yong, Tsutomu Tom Yamashita
  • Magnetic disk comprising a first carbon overcoat having a high SP3 content and a second carbon overcoat having a low SP3 content
    Publication number: 20030027019
    Abstract: A method for making a magnetic disk comprises forming first and second protective carbon layers on a magnetic layer. The first protective carbon layer is predominantly SP3 carbon. The second protective carbon layer comprises about 50% or less SP3 carbon. The second protective carbon layer is very thin, e.g. between 0.1 and 1.0 nm thick. A lubricant layer (e.g. a perfluoropolyether lubricant) is applied to the second protective carbon layer. The second protective carbon layer facilitates improved cooperation between lubricant and the disk.
    Type: Application
    Filed: September 26, 2002
    Publication date: February 6, 2003
    Inventors: Bruce Lairson, Ching Jackie Tsoi, Wen Liu, Shigeto Hashimoto, Eric Woo Hock Yong, Tsutomu Tom Yamashita