Patents by Inventor Honghui Tong

Honghui Tong 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).

  • Patent number: 7589474
    Abstract: A closed drift ion source is disclosed. The ion source has an open end 1 and a central axis 150 around which are arranged outer magnetic pole piece 3, inner magnetic pole piece 5, anode 2, shield 6 and back magnetic shunt 17. In one embodiment the anode 2 and inner magnetic pole piece 5 are annular. Permanent magnets 7 are located behind the shield 6 and in contact with outer magnetic pole piece 3 and the back magnetic shunt 17. As a result the magnetic field lines pass through the magnetic pole pieces and a mirror magnetic field is set up in the discharge region between them. The inner magnetic pole piece 5 is hollow which facilitates production of the mirror magnetic field.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: September 15, 2009
    Assignee: City University of Hong Kong
    Inventors: Paul K. Chu, Deli Tang, Shihao Pu, Honghui Tong, Qingchuan Chen
  • Publication number: 20080136309
    Abstract: A closed drift ion source is disclosed. The ion source has an open end 1 and a central axis 150 around which are arranged outer magnetic pole piece 3, inner magnetic pole piece 5, anode 2, shield 6 and back magnetic shunt 17. In one embodiment the anode 2 and inner magnetic pole piece 5 are annular. Permanent magnets 7 are located behind the shield 6 and in contact with outer magnetic pole piece 3 and the back magnetic shunt 17. As a result the magnetic field lines pass through the magnetic pole pieces and a mirror magnetic field is set up in the discharge region between them. The inner magnetic pole piece 5 is hollow which facilitates production of the mirror magnetic field.
    Type: Application
    Filed: December 6, 2006
    Publication date: June 12, 2008
    Inventors: Paul K. Chu, Deli Tang, Shihao Pu, Honghui Tong, Qingchuan Chen