Patents by Inventor Stephen Wah-Kwan Cheung

Stephen Wah-Kwan Cheung 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: 9258876
    Abstract: Provided herein are systems and methods for operating a traveling wave linear accelerator to generate stable electron beams at two or more different intensities by varying the number of electrons injected into the accelerator structure during each pulse by varying the width of the beam pulse, i.e., pulse width.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: February 9, 2016
    Assignee: Accuray, Inc.
    Inventors: Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Patent number: 9031200
    Abstract: The disclosure relates to systems and methods for interleaving operation of a standing wave linear accelerator (LINAC) for use in providing electrons of at least two different energy ranges, which can be contacted with x-ray targets to generate x-rays of at least two different energy ranges. The LINAC can be operated to output electrons at different energies by varying the power of the electromagnetic wave input to the LINAC, or by using a detunable side cavity which includes an activatable window.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: May 12, 2015
    Assignee: Accuray Incorporated
    Inventors: Ching-Hung Ho, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Patent number: 8942351
    Abstract: Provided herein are systems and methods for operating a traveling wave linear accelerator to generate stable electron beams at two or more different intensities by varying the number of electrons injected into the accelerator structure during each pulse by varying the width of the beam pulse, i.e., pulse width. The electron beams may be used to generate x-rays having selected doses and energies, which may be used for cargo scanning or radiotherapy applications.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: January 27, 2015
    Assignee: Accuray Incorporated
    Inventors: Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Patent number: 8836250
    Abstract: Provided herein are systems and methods for operating a traveling wave linear accelerator to generate stable electron beams at two or more different intensities by varying the number of electrons injected into the accelerator structure during each pulse by varying the electron beam current applied to an electron gun. The electron beams may be used to generate x-rays having selected doses and energies, which may be used for cargo scanning or radiotherapy applications.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: September 16, 2014
    Assignee: Accuray Incorporated
    Inventors: Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Patent number: 8786217
    Abstract: The disclosure relates to systems and methods for fast-switching operating of a standing wave linear accelerator (LINAC) for use in generating x-rays of at least two different energy ranges with advantageously low heating of electronic switches. In certain embodiments, the heating of electronic switches during a fast-switching operation of the LINAC can be kept advantageously low through the controlled, timed activation of multiple electronic switches located in respective side cavities of the standing wave LINAC, or through the use of a modified a side cavity that includes an electronic switch.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: July 22, 2014
    Assignee: Accuray Incorporated
    Inventors: Ching-Hung Ho, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20130063052
    Abstract: The disclosure relates to systems and methods for interleaving operation of a standing wave linear accelerator (LINAC) for use in providing electrons of at least two different energy ranges, which can be contacted with x-ray targets to generate x-rays of at least two different energy ranges. The LINAC can be operated to output electrons at different energies by varying the power of the electromagnetic wave input to the LINAC, or by using a detunable side cavity which includes an activatable window.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 14, 2013
    Applicant: Accuray, Inc.
    Inventors: Ching-Hung Ho, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20120313555
    Abstract: The disclosure relates to systems and methods for fast-switching operating of a standing wave linear accelerator (LINAC) for use in generating x-rays of at least two different energy ranges with advantageously low heating of electronic switches. In certain embodiments, the heating of electronic switches during a fast-switching operation of the LINAC can be kept advantageously low through the controlled, timed activation of multiple electronic switches located in respective side cavities of the standing wave LINAC, or through the use of a modified a side cavity that includes an electronic switch.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 13, 2012
    Inventors: Ching-Hung HO, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20120294423
    Abstract: Provided herein are systems and methods for operating a traveling wave linear accelerator to generate stable electron beams at two or more different intensities by varying the number of electrons injected into the accelerator structure during each pulse by varying the width of the beam pulse, i.e., pulse width. The electron beams may be used to generate x-rays having selected doses and energies, which may be used for cargo scanning or radiotherapy applications.
    Type: Application
    Filed: May 16, 2012
    Publication date: November 22, 2012
    Inventors: Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20120294422
    Abstract: Provided herein are systems and methods for operating a traveling wave linear accelerator to generate stable electron beams at two or more different intensities by varying the number of electrons injected into the accelerator structure during each pulse by varying the electron beam current applied to an electron gun. The electron beams may be used to generate x-rays having selected doses and energies, which may be used for cargo scanning or radiotherapy applications.
    Type: Application
    Filed: May 16, 2012
    Publication date: November 22, 2012
    Inventors: Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Patent number: 8284898
    Abstract: The disclosure relates to systems and methods for interleaving operation of a standing wave linear accelerator (LINAC) for use in providing electrons of at least two different energy ranges, which can be contacted with x-ray targets to generate x-rays of at least two different energy ranges. The LINAC can be operated to output electrons at different energies by varying the power of the electromagnetic wave input to the LINAC, or by using a detunable side cavity which includes an activatable window.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: October 9, 2012
    Assignee: Accuray, Inc.
    Inventors: Ching-Hung Ho, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Patent number: 8203289
    Abstract: The disclosure relates to systems and methods for fast-switching operating of a standing wave linear accelerator (LINAC) for use in generating x-rays of at least two different energy ranges with advantageously low heating of electronic switches. In certain embodiments, the heating of electronic switches during a fast-switching operation of the LINAC can be kept advantageously low through the controlled, timed activation of multiple electronic switches located in respective side cavities of the standing wave LINAC, or through the use of a modified a side cavity that includes an electronic switch.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: June 19, 2012
    Assignee: Accuray, Inc.
    Inventors: Ching-Hung Ho, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20120081041
    Abstract: Provided herein are systems and methods for operating a traveling wave linear accelerator to generate stable electron beams at two or more different intensities by varying the number of electrons injected into the accelerator structure during each pulse by varying the width of the beam pulse, i.e., pulse width.
    Type: Application
    Filed: December 22, 2010
    Publication date: April 5, 2012
    Applicant: ACCURAY, INC.
    Inventors: Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20120081042
    Abstract: Provided herein are systems and methods for operating a traveling wave linear accelerator to generate stable electron beams at two or more different intensities by varying the number of electrons injected into the accelerator structure during each pulse by varying the electron beam current applied to an electron gun.
    Type: Application
    Filed: December 22, 2010
    Publication date: April 5, 2012
    Applicant: ACCURAY, INC.
    Inventors: Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20110216886
    Abstract: The disclosure relates to systems and methods for interleaving operation of a standing wave linear accelerator (LINAC) for use in providing electrons of at least two different energy ranges, which can be contacted with x-ray targets to generate x-rays of at least two different energy ranges. The LINAC can be operated to output electrons at different energies by varying the power of the electromagnetic wave input to the LINAC, or by using a detunable side cavity which includes an activatable window.
    Type: Application
    Filed: March 5, 2010
    Publication date: September 8, 2011
    Inventors: Ching-Hung Ho, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang
  • Publication number: 20110006708
    Abstract: The disclosure relates to systems and methods for fast-switching operating of a standing wave linear accelerator (LINAC) for use in generating x-rays of at least two different energy ranges with advantageously low heating of electronic switches. In certain embodiments, the heating of electronic switches during a fast-switching operation of the LINAC can be kept advantageously low through the controlled, timed activation of multiple electronic switches located in respective side cavities of the standing wave LINAC, or through the use of a modified a side cavity that includes an electronic switch.
    Type: Application
    Filed: July 8, 2009
    Publication date: January 13, 2011
    Inventors: Ching-Hung Ho, Stephen Wah-Kwan Cheung, Roger Heering Miller, Juwen Wang