Patents by Inventor Qing Ji

Qing Ji 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).

  • Publication number: 20030218430
    Abstract: A radio frequency (RF) driven plasma ion source has an external RF antenna, i.e. the RF antenna is positioned outside the plasma generating chamber rather than inside. The RF antenna is typically formed of a small diameter metal tube coated with an insulator. A flange is used to mount the external RF antenna to the ion source. The RF antenna tubing is wound around the flange to form a coil. The flange is formed of a material, e.g. quartz, that is essentially transparent to the RF waves. The flange is attached to and forms a part of the plasma source chamber so that the RF waves emitted by the RF antenna enter into the inside of the plasma chamber and ionize a gas contained therein. The plasma ion source is typically a multi-cusp ion source.
    Type: Application
    Filed: May 22, 2003
    Publication date: November 27, 2003
    Inventors: Ka-Ngo Leung, Qing Ji, Stephen Wilde
  • Publication number: 20030168608
    Abstract: An extractor system for a plasma ion source has a single (first) electrode with one or more apertures, or a pair of spaced electrodes, a first or plasma forming electrode and a second or extraction electrode, with one or more aligned apertures. The aperture(s) in the first electrode (or the second electrode or both) have a counterbore on the downstream side (i.e. away from the plasma ion source or facing the second electrode). The counterbored extraction system reduces aberrations and improves focusing. The invention also includes an ion source with the counterbored extraction system, and a method of improving focusing in an extraction system by providing a counterbore.
    Type: Application
    Filed: February 13, 2003
    Publication date: September 11, 2003
    Inventors: Qing Ji, Keith Standiford, Tsu-Jae King, Ka-Ngo Leung
  • Patent number: 6392068
    Abstract: The present invention relates to novel carborane cholesterol analogs and their use in the treatment of tumor and cancers in humans, and in particular to the treatment of human brain tumors. Pharmaceutical compositions and methods of using these compositions in the treatment of tumors and cancer are other aspects of the present invention.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: May 21, 2002
    Assignee: The University of Georgia Research Foundation, Inc.
    Inventors: Donghao Robert Lu, Bing Qing Ji
  • Patent number: 5945677
    Abstract: A focused ion beam (FIB) system produces a final beam spot size down to 0.1 .mu.m or less and an ion beam output current on the order of microamps. The FIB system increases ion source brightness by properly configuring the first (plasma) and second (extraction) electrodes. The first electrode is configured to have a high aperture diameter to electrode thickness aspect ratio. Additional accelerator and focusing electrodes are used to produce the final beam. As few as five electrodes can be used, providing a very compact FIB system with a length down to only 20 mm. Multibeamlet arrangements with a single ion source can be produced to increase throughput. The FIB system can be used for nanolithography and doping applications for fabrication of semiconductor devices with minimum feature sizes of 0.1 .mu.m or less.
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: August 31, 1999
    Assignee: The Regents of the University of California
    Inventors: Ka-Ngo Leung, Richard A. Gough, Qing Ji, Yung-Hee Yvette Lee