Patents by Inventor James Dong

James Dong 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).

  • PREPARATION OF QUINACRIDONEQUINONES AND SUBSTITUTED DERIVATIVES OF SAME
    Publication number: 20050154207
    Abstract: A process for by oxidizing a quinacridone in a liquid medium with a non-metal oxidant producing a quinacridonequinone.
    Type: Application
    Filed: January 14, 2004
    Publication date: July 14, 2005
    Inventors: Edward Sung, James Dong, George Robertson
  • InGaN/AlGaN/GaN multilayer buffer for growth of GaN on sapphire
    Patent number: 6630695
    Abstract: A GaN based three layer buffer structure disposed on a substrate, and having a GaN layer disposed on the three layer buffer structure, the GaN layer serving as a platform for growth of a light emitting structure thereon.
    Type: Grant
    Filed: July 8, 2002
    Date of Patent: October 7, 2003
    Inventors: Changhua Chen, James Dong, Heng Liu
  • InGaN/AlGaN/GaN multilayer buffer for growth of GaN on sapphire
    Patent number: 6495867
    Abstract: A GaN based three layer buffer on a sapphire substrate provides a template for growth of a high quality I GaN layer as a substitute substrate for growth of a Nitride based LED.
    Type: Grant
    Filed: July 26, 2000
    Date of Patent: December 17, 2002
    Assignee: AXT, Inc.
    Inventors: Changhua Chen, James Dong, Heng Liu
  • InGaN/A1GaN/GaN Multilayer Buffer for Growth of GaN on Sapphire
    Publication number: 20020175337
    Abstract: A GaN based three layer buffer on a sapphire substrate provides a template for growth of a high quality I GaN layer as a substitute substrate for growth of a Nitride based LED.
    Type: Application
    Filed: July 8, 2002
    Publication date: November 28, 2002
    Applicant: AXT, Inc.
    Inventors: Changhua Chen, James Dong, Heng Liu