Patents by Inventor Charles R. Sullivan

Charles R. Sullivan 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: 20210304949
    Abstract: A resonant coil with integrated capacitance includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and second conductor sublayer having common orientation and a sublayer dielectric layer separating the first and second conductor sublayers. Adjacent conductor layers of the plurality of conductor layers have different orientations.
    Type: Application
    Filed: July 21, 2017
    Publication date: September 30, 2021
    Inventors: Charles R. SULLIVAN, Aaron L. F. STEIN, Phyo Aung KYAW
  • Publication number: 20210050136
    Abstract: A resonant coil with integrated capacitance includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and second conductor sublayer having common orientation and a sublayer dielectric layer separating the first and second conductor sublayers, each conductor layer having multiple discontinuities.
    Type: Application
    Filed: August 14, 2020
    Publication date: February 18, 2021
    Inventors: Phyo Aung Kyaw, Aaron Stein, Charles R. Sullivan
  • Publication number: 20200331067
    Abstract: In an embodiment, the present disclosure pertains to a method of making a composite. In some embodiments, the method includes applying an external magnetic field to a mixture composed of a plurality of magnetic materials in a container, in which the external magnetic field produces a homogenous and uniform magnetic flux in the container. In some embodiments, the method further includes solidifying the mixture to result in the growth of solvent crystals in the mixture, and subliming a solvent phase of the mixture in the container to thereby form a composite having uniformly aligned magnetic materials. In an additional embodiment, the present disclosure pertains to a composite having uniformly aligned magnetic materials. In some embodiments, a majority of the magnetic materials in the composite are aligned in the same direction.
    Type: Application
    Filed: April 22, 2020
    Publication date: October 22, 2020
    Applicant: Trustees of Dartmouth College
    Inventors: Bradley A. Reese, Ulrike G. K. Wegst, Charles R. Sullivan
  • Patent number: 10707011
    Abstract: A multilayer conductor includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and a second conductor sublayer separated from the first conductor sublayer by a sublayer dielectric layer. The second conductor sublayer at least partially overlaps with the first conductor sublayer in each of the plurality of conductor layers. The multilayer conductor is included, for example, in a device including a magnetic core adjacent to at least part of the multilayer conductor.
    Type: Grant
    Filed: October 22, 2018
    Date of Patent: July 7, 2020
    Assignee: THE TRUSTEES OF DARTMOUTH COLLEGE
    Inventor: Charles R. Sullivan
  • Publication number: 20190057806
    Abstract: A multilayer conductor includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and a second conductor sublayer separated from the first conductor sublayer by a sublayer dielectric layer. The second conductor sublayer at least partially overlaps with the first conductor sublayer in each of the plurality of conductor layers. The multilayer conductor is included, for example, in a device including a magnetic core adjacent to at least part of the multilayer conductor.
    Type: Application
    Filed: October 22, 2018
    Publication date: February 21, 2019
    Inventor: Charles R. Sullivan
  • Patent number: 10109413
    Abstract: A multilayer conductor includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and a second conductor sublayer separated from the first conductor sublayer by a sublayer dielectric layer. The second conductor sublayer at least partially overlaps with the first conductor sublayer in each of the plurality of conductor layers. The multilayer conductor is included, for example, in a device including a magnetic core adjacent to at least part of the multilayer conductor.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: October 23, 2018
    Assignee: THE TRUSTEES OF DARTMOUTH COLLEGE
    Inventor: Charles R. Sullivan
  • Patent number: 9659706
    Abstract: A method of forming a radially anisotropic toroidal magnetic core includes providing apparatus having a first magnet for providing a radial magnetic field extending across a cavity from an axial spindle to a surrounding second magnetic element, placing a substrate in the cavity, the substrate having a hole fitting around the head of the spindle; and sputter-depositing a film of ferromagnetic material onto the substrate. In an embodiment, the spindle is magnetically coupled to a first pole of the first magnet, the second magnetic element is coupled to a second pole of the first magnet, and a thermally conductive, nonmagnetic, insert separates the spindle and the second magnetic element.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: May 23, 2017
    Assignee: THE TRUSTEES OF DARTMOUTH COLLEGE
    Inventors: Jizheng Qiu, Charles R. Sullivan
  • Publication number: 20160149122
    Abstract: A method for exposing a photoresist material to light includes the following steps: (1) optically coupling the light to an optical mask via a prism and a first liquid layer joining the prism and the optical mask, (2) masking the light using the optical mask, and (3) optically coupling the masked light to the photoresist material. The method is used, for example, to fabricate a magnetic device on a semiconductor substrate. A hybrid semiconductor and magnetic device includes a semiconductor substrate and a top insulating structure deposited on an outer surface of the semiconductor substrate. The top insulating structure has opposing first and second sloping sidewalls, where each sloping sidewall forms an acute angle of at least 30 degrees, relative to an axis normal to the outer surface of the semiconductor substrate. The hybrid semiconductor and magnetic device further includes a magnetic core surrounding the top insulating structure.
    Type: Application
    Filed: June 13, 2014
    Publication date: May 26, 2016
    Inventors: Charles R. Sullivan, Daniel V. Harburg, Christopher G. Levey, Song Yue
  • Publication number: 20160005531
    Abstract: A multilayer conductor includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and a second conductor sublayer separated from the first conductor sublayer by a sublayer dielectric layer. The second conductor sublayer at least partially overlaps with the first conductor sublayer in each of the plurality of conductor layers. The multilayer conductor is included, for example, in a device including a magnetic core adjacent to at least part of the multilayer conductor.
    Type: Application
    Filed: January 31, 2014
    Publication date: January 7, 2016
    Inventor: Charles R. Sullivan
  • Publication number: 20150279549
    Abstract: A magnetic device includes a winding forming N turns, where N is an integer greater than or equal to one. The winding includes a stack of M foil conductors electrically coupled in parallel, where adjacent foil conductors of the stack of M foil conductors are separated from each other by a respective separation layer. M is an integer greater than one. Each separation layer has dimensions such that net magnetic flux in the separation layer is substantially zero when a changing current of equal magnitude flows through each of the M foil conductors. Another magnetic device includes M foil conductors electrically coupled in parallel. M is an integer greater than one. The M foil conductors are magnetically coupled. The other magnetic device further includes a current balancing transformer electrically coupled to the M foil conductors.
    Type: Application
    Filed: August 2, 2013
    Publication date: October 1, 2015
    Inventors: Charles R. Sullivan, Jason T. Stauth
  • Patent number: 9147515
    Abstract: An M phase coupled inductor includes a magnetic core including a first end magnetic element, a second end magnetic element, and M legs disposed between and connecting the first and second end magnetic elements. M is an integer greater than one. The coupled inductor further includes M windings, where each winding has a substantially rectangular cross section. Each one of the M windings is at least partially wound about a respective leg.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: September 29, 2015
    Assignee: Volterra Semiconductor LLC
    Inventors: Jieli Li, Charles R. Sullivan, Angel Gentchev
  • Patent number: 9019064
    Abstract: An M phase coupled inductor includes a magnetic core including a first end magnetic element, a second end magnetic element, and M legs disposed between and connecting the first and second end magnetic elements. M is an integer greater than one. The coupled inductor further includes M windings, where each winding has a substantially rectangular cross section. Each one of the M windings is at least partially wound about a respective leg.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: April 28, 2015
    Assignee: Volterra Semiconductor Corporation
    Inventors: Alexandr Ikriannikov, Anthony J. Stratakos, Charles R. Sullivan, Aaron M. Schultz, Jieli Li
  • Patent number: 8921739
    Abstract: Cost efficient, lightweight and rapid windshield deicing systems and methods are disclosed. The systems utilize step-up converters or inverters, or dual-voltage batteries, to provide a voltage high enough to deice a windshield in less than thirty seconds at ambient temperatures above ?10 C. Some of the disclosed systems include sensors for deicing element and ambient temperatures, and in some embodiments windspeed. All embodiments have a controller for limiting deicing time to that sufficient to melt a boundary layer of ice. The controller of embodiments with sensors computes deicing time as a function of ambient temperature. Embodiments interact with wiper systems to enable wipers to clear ice once the boundary layer is melted.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: December 30, 2014
    Assignee: The Trustees of Dartmouth College
    Inventors: Victor Petrenko, Charles R. Sullivan, Oleg Nickolayev, Valeri Kozlyuk
  • Patent number: 8847722
    Abstract: Methods and structures for constructing a magnetic core of a coupled inductor. The method provides for constructing N-phase coupled inductors as both single and scalable magnetic structures, where N is an integer greater than 1. The method additionally describes how such a construction of the magnetic core may enhance the benefits of using the scalable N-phase coupled inductor. The first and second magnetic cores may be formed into shapes that, when coupled together, may form a single scalable magnetic core. For example, the cores can be fashioned into shapes such as a U, an I, an H, a ring, a rectangle, and a comb, that cooperatively form the single magnetic core.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: September 30, 2014
    Assignee: Volterra Semiconductor Corporation
    Inventors: Jieli Li, Charles R. Sullivan, Anthony J. Stratakos
  • Patent number: 8836461
    Abstract: An M phase coupled inductor includes a magnetic core including a first end magnetic element, a second end magnetic element, and M legs disposed between and connecting the first and second end magnetic elements. M is an integer greater than one. The coupled inductor further includes M windings, where each winding has a substantially rectangular cross section. Each one of the M windings is at least partially wound about a respective leg.
    Type: Grant
    Filed: March 10, 2013
    Date of Patent: September 16, 2014
    Assignee: Volterra Semiconductor Corporation
    Inventors: Jieli Li, Charles R. Sullivan, Angel Gentchev
  • Publication number: 20140247104
    Abstract: An M phase coupled inductor includes a magnetic core including a first end magnetic element, a second end magnetic element, and M legs disposed between and connecting the first and second end magnetic elements. M is an integer greater than one. The coupled inductor further includes M windings, where each winding has a substantially rectangular cross section. Each one of the M windings is at least partially wound about a respective leg.
    Type: Application
    Filed: May 13, 2014
    Publication date: September 4, 2014
    Applicant: Volterra Semiconductor Corporation
    Inventors: Jieli Li, Charles R. Sullivan, Angel Gentchev
  • Publication number: 20140240074
    Abstract: A radially anisotropic toroidal magnetic core is fabricated by a method including providing apparatus having a first magnet for providing a radial magnetic field extending across a cavity from an axial spindle to a surrounding second magnetic element, placing a substrate in the cavity, the substrate having a hole fitting around the head of the spindle; and sputter-depositing a film of ferromagnetic material onto the substrate. An alternative fabrication uses a similar fixture to impose magnetic anisotropy by annealing a previously-formed toroidal core. A particular fixture adapted for deposition by electroplating or for applying anisotropy by annealing pre-formed cores applies magnetic fields symmetrically from above and below the cores. Also described are the radially anisotropic core produced by the method, and an inductor having a coil wound on the radially anisotropic core.
    Type: Application
    Filed: September 24, 2012
    Publication date: August 28, 2014
    Applicant: The Trutees of Dart,outh College
    Inventors: Jizheng Qui, Charles R. Sullivan
  • Patent number: 8786395
    Abstract: An M phase coupled inductor includes a magnetic core including a first end magnetic element, a second end magnetic element, and M legs disposed between and connecting the first and second end magnetic elements. M is an integer greater than one. The coupled inductor further includes M windings, where each winding has a substantially rectangular cross section. Each one of the M windings is at least partially wound about a respective leg.
    Type: Grant
    Filed: March 10, 2013
    Date of Patent: July 22, 2014
    Assignee: Volterra Semiconductor Corporation
    Inventors: Jieli Li, Charles R. Sullivan, Angel Gentchev
  • Patent number: 8779885
    Abstract: An M phase coupled inductor includes a magnetic core including a first end magnetic element, a second end magnetic element, and M legs disposed between and connecting the first and second end magnetic elements. M is an integer greater than one. The coupled inductor further includes M windings, where each winding has a substantially rectangular cross section. Each one of the M windings is at least partially wound about a respective leg.
    Type: Grant
    Filed: March 10, 2013
    Date of Patent: July 15, 2014
    Assignee: Volterra Semiconductor Corporation
    Inventors: Jieli Li, Charles R. Sullivan, Angel Gentchev
  • Patent number: 8760135
    Abstract: A system or module has a 3-or-more layer current-controlled switching device, such as a bipolar power transistor, for driving a load and a base driver circuit coupled to drive it. The driver has a buck-converter configuration for efficiently driving the switching device. In an embodiment, the driver has an inductor, the inductor having a first terminal coupled to a base of the bipolar junction transistor, a high-side switching device coupled to drive a second terminal of the inductor; and a rectification device coupled to the second terminal of the inductor. The driver also has a control circuit for providing a sequence of pulses through the high-side switching device when a control signal indicates the bipolar junction transistor is to be turned on.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: June 24, 2014
    Assignee: The Trustees of Dartmouth College
    Inventors: Charles R. Sullivan, Michael Teroerde