Patents by Inventor John Michael Miller

John Michael Miller 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: 8040607
    Abstract: A bilayer transmission diffraction grating having antireflection lines having rectangular cross-section over grating lines having trapezoidal cross-section is described. The process-dependent grating line profile is accounted for by characterizing the grating line profile and performing electromagnetic wave diffraction simulations, whereby a grating duty cycle is selected that results in an improvement of overall diffraction efficiency and/or reducing polarization dependent loss of a diffraction grating having the characterized grating line profile. Grooves in the substrate between the grating lines further improve diffraction efficiency and reduce polarization dependent loss. The entire grating line profile, including the antireflection line, the grating line, and the groove in the substrate between the grating lines, can be defined using a single etch mask, which reduces process and equipment related manufacturing costs.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: October 18, 2011
    Assignee: JDS Uniphase Corporation
    Inventor: John Michael Miller
  • Patent number: 7903318
    Abstract: Diffractive patterns are disposed on a MEMS substrate in the gaps between the MEMS micromirrors to reduce backreflection of light leaking through the gaps and reflected by the MEMS substrate. The diffractive patterns are silicon surface-relief diffraction gratings or silicon oxide gratings on silicon substrate. Sub-wavelength gratings are used to suppress higher orders of diffraction; 50% duty cycle surface relief gratings on a substrate having index of refraction close to 3 are used to suppress both reflected and transmitted zero orders of diffraction simultaneously. The gratings have lines running parallel or at a slight angle to the gaps, to prevent the diffracted light from re-entering the gaps.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: March 8, 2011
    Assignee: JDS Uniphase Corporation
    Inventors: Abdul Jaleel K. Moidu, Paul Colbourne, Keith Anderson, John Michael Miller
  • Patent number: 7723810
    Abstract: To reduce cross-talk between adjacent hot electrodes, the present invention provides a ground plane, which extends beneath each side of a MEMS mirror platform covering opposite edges of a hot electrode along each side thereof. The ground plane includes an overhang section extending between the mirror platform and the hot electrode forming a first gap between the hot electrode and the overhang section, and a second gap between the overhang section and the mirror platform. The method of the present invention enables highly accurate construction using lithographic patterning and deep reactive ion etching (DRIE).
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: May 25, 2010
    Assignee: JDS Uniphase Corporation
    Inventors: John Michael Miller, Steven Harold Moffat
  • Patent number: 7616372
    Abstract: The micro-electro-mechanical mirror device according to the present invention includes a platform pivotable about two perpendicular axes, and a hinge structure disposed beneath the platform. The hinge structure includes first and second hinges and a gimbal ring fabricated in a single layer beneath the platform layer. One end of the hinge structure extends from the undersurface of the platform, while the other end extends from a pedestal, which extends upwardly from a substrate.
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: November 10, 2009
    Assignee: JDS Uniphase Corporation
    Inventors: John Michael Miller, Barrie Keyworth
  • Publication number: 20090268295
    Abstract: A bilayer transmission diffraction grating having antireflection lines having rectangular cross-section over grating lines having trapezoidal cross-section is described. The process-dependent grating line profile is accounted for by characterizing the grating line profile and performing electromagnetic wave diffraction simulations, whereby a grating duty cycle is selected that results in an improvement of overall diffraction efficiency and/or reducing polarization dependent loss of a diffraction grating having the characterized grating line profile. Grooves in the substrate between the grating lines further improve diffraction efficiency and reduce polarization dependent loss. The entire grating line profile, including the antireflection line, the grating line, and the groove in the substrate between the grating lines, can be defined using a single etch mask, which reduces process and equipment related manufacturing costs.
    Type: Application
    Filed: April 7, 2009
    Publication date: October 29, 2009
    Inventor: John Michael MILLER
  • Publication number: 20090190202
    Abstract: Diffractive patterns are disposed on a MEMS substrate in the gaps between the MEMS micromirrors to reduce backreflection of light leaking through the gaps and reflected by the MEMS substrate. The diffractive patterns are silicon surface-relief diffraction gratings or silicon oxide gratings on silicon substrate. Sub-wavelength gratings are used to suppress higher orders of diffraction; 50% duty cycle surface relief gratings on a substrate having index of refraction close to 3 are used to suppress both reflected and transmitted zero orders of diffraction simultaneously. The gratings have lines running parallel or at a slight angle to the gaps, to prevent the diffracted light from re-entering the gaps.
    Type: Application
    Filed: January 27, 2009
    Publication date: July 30, 2009
    Inventors: Abdul Jaleel K. Moidu, Paul Colbourne, Keith Anderson, John Michael Miller
  • Publication number: 20090071708
    Abstract: To reduce cross-talk between adjacent hot electrodes, the present invention provides a ground plane, which extends beneath each side of a MEMS mirror platform covering opposite edges of a hot electrode along each side thereof. The ground plane includes an overhang section extending between the mirror platform and the hot electrode forming a first gap between the hot electrode and the overhang section, and a second gap between the overhang section and the mirror platform. The method of the present invention enables highly accurate construction using lithographic patterning and deep reactive ion etching (DRIE).
    Type: Application
    Filed: August 1, 2008
    Publication date: March 19, 2009
    Inventors: John Michael Miller, Steven Harold Moffat
  • Patent number: 7432629
    Abstract: The present invention relates to an articulated micro-electro-mechanical (MEMS) device, which is constructed in such a way as to enable several of the devices to be closely packed together, i.e. high fill factor, for redirecting specific wavelengths of light from a dispersed optical signal to different output ports. The articulated MEMS device includes multiple pivotally connected sections that are pivotable about two perpendicular axes for limiting the amount of dynamic cross-talk as the device is rotated between different positions.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: October 7, 2008
    Assignee: JDS Uniphase Corporation
    Inventors: Mohiuddin Mala, Barrie Keyworth, John Michael Miller, Thomas Ducellier, Graham McKinnon
  • Patent number: 7302131
    Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention electrostatic charges, which build up on exposed dielectric surfaces causing the mirror's angular position to drift over time, are minimized by positioning the hot and ground electrodes at different levels separated by a vertical surface, and placing the dielectric material on the vertical surface.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: November 27, 2007
    Assignee: JDS Uniphase Inc.
    Inventors: Yuan Ma, Graham McKinnon, John Michael Miller
  • Patent number: 7302132
    Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention specially designed for wavelength switching applications, a greater range of arcuate motion for a mirror mounted thereon is provided by enabling the platform to rotate about two perpendicular axes.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: November 27, 2007
    Assignee: JDS Uniphase Inc.
    Inventors: John Michael Miller, Yuan Ma, Barrie Keyworth, Mohiuddin Mala, Graham McKinnon
  • Patent number: 7203413
    Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention electrostatic charges, which build up on exposed dielectric surfaces causing the mirror's angular position to drift over time, are minimized by positioning the hot and ground electrodes at different levels separated by a vertical surface, and placing the dielectric material on the vertical surface.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: April 10, 2007
    Assignee: JDS Uniphase Inc.
    Inventors: Yuan Ma, Graham McKinnon, John Michael Miller
  • Patent number: 7200580
    Abstract: The present invention generally relates to industrial automation, and in particular to systems and methods that facilitate rendering data in an industrial automation environment. Specifically, the invention gathers data via a high-speed data collection device and transmits high-resolution data to a trend server. A trend server can batch or buffer the high-resolution data for transmission to a user interface, such as a Human Machine Interface. A run-time reduction modulo m (RTRm) component can index data to permit a reduction in data read time. A user interface can render the data at high resolution to provide the user with a real-time, seamless display of information.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: April 3, 2007
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Barrie Kovish, John Michael Miller
  • Patent number: 7110635
    Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention specially designed for wavelength switching applications, a greater range of arcuate motion for a mirror mounted thereon is provided by enabling the platform to rotate about two perpendicular axes.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: September 19, 2006
    Assignee: JDS Uniphase Inc.
    Inventors: John Michael Miller, Yuan Ma, Barrie Keyworth, Mohiuddin Mala, Graham McKinnon
  • Patent number: 7110637
    Abstract: A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment the range of angular motion of a MEMs device's platform is increased by reducing the field strength, i.e. the force per unit area, that is sensed at the outer free ends of the platform. Ideally two-step electrodes are provided with a lower step positioned beneath the outer free end of the platform.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: September 19, 2006
    Assignee: JDS Uniphase Inc.
    Inventors: Yuan Ma, Mohiuddin Mala, John Michael Miller
  • Patent number: 7010188
    Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention specially designed for wavelength switching applications, a greater range of arcuate motion for a mirror mounted thereon is provided by enabling the platform to rotate about two perpendicular axes.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: March 7, 2006
    Assignee: JDS Uniphase Inc.
    Inventors: John Michael Miller, Yuan Ma, Barrie Keyworth, Wenlin Jin, David R. Hess
  • Patent number: 6984954
    Abstract: A strategy to control and diagnose the operation of an electric motor using a sensorless control system augmented by feedback from a position and speed sensor is disclosed. The strategy can improve the robustness of operation and diagnose potential faults in electric motors. The present invention includes a method for diagnosing operation of an electric motor and a method and system for controlling an electric motor. In the diagnostic method, a sensorless system and a sensor based system are checked against each other to determine if either of the systems is faulted. In the control method, the sensor based control system is used when the motor speed is below a predetermined threshold and the sensorless system is used when the motor speed is above the predetermined threshold. The position sensor can be a low resolution position sensor, an engine crankshaft sensor, an engine camshaft sensor, or a transmission sensor.
    Type: Grant
    Filed: April 14, 2004
    Date of Patent: January 10, 2006
    Assignee: Ford Global Technologies, LLC
    Inventors: Franco Leonardi, Henry Heping Huang, John Michael Miller, Michael W. Degner
  • Patent number: 6968101
    Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention specially designed for wavelength switching applications, a greater range of arcuate motion for a mirror mounted thereon is provided by enabling the platform to rotate about two perpendicular axes.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: November 22, 2005
    Assignee: JDS Uniphase Inc.
    Inventors: John Michael Miller, Yuan Ma, Barrie Keyworth, Wenlin Jin, David R. Hess
  • Patent number: 6934439
    Abstract: A micro-electro-mechanical (MEMs) mirror device for use in an optical switch is disclosed. A “piano”-style MEMs device includes an elongated platform pivotally mounted proximate the middle thereof by a torsional hinge. The middle portion of the platform and the torsional hinge have a combined width less than the width of the rest of the platform, whereby several of these “piano” MEMs devices can be positioned adjacent each other pivotally mounted about the same axis with only a relatively small air gap therebetween. In a preferred embodiment of the present invention specially designed for wavelength switching applications, a greater range of arcuate motion for a mirror mounted thereon is provided by enabling the platform to rotate about two perpendicular axes.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: August 23, 2005
    Assignee: JDS Uniphase Inc.
    Inventors: Mohiuddin Mala, John Michael Miller, Graham McKinnon, Yuan Ma
  • Patent number: 6876176
    Abstract: A system including an induction machine with a toroidally wound stator and a squirrel cage rotor is presented. The toroidally wound stator has a plurality of phase windings. A position sensor may be operatively connected to the induction machine for providing a position indication that is indicative of a relative position of the rotor and the stator. The system also includes an inverter having a plurality of solid-state switches and a control system. The inverter has the same number of phases as the toroidal induction machine. The inverter is connected to selectively energize the phase windings. A programmable microprocessor, such as a digital signal processor, is operatively connected to the induction machine and includes a program to implement vector control of the induction machine. The microprocessor can also control the inverter so that the induction machine operates with a predetermined number of poles using pole phase modulation.
    Type: Grant
    Filed: December 2, 2000
    Date of Patent: April 5, 2005
    Assignee: Ford Global Technologies, LLC
    Inventors: Victor R. Stefanovic, John Michael Miller
  • Patent number: 6840200
    Abstract: An electromechanical valve assembly 46 for an internal combustion engine 36 is provided. The valve assembly 46 includes a rotor 68 centered about a first axis 122 having a bore 114 extending generally axially therethrough. The valve assembly 46 further includes a stator 66 operatively disposed about the rotor 68 for producing a torque to cause rotation of the rotor 68 about the axis 122. Finally, the valve assembly 46 includes a valve 70 having a valve stem 126 and a valve head 84 The valve stem 126 extends generally axially through the bore 114 of the rotor 68. The valve stem 126 is also configured to move generally axially responsive to the rotation of the rotor 68 to selectively engage and disengage the valve head 84 with a valve seat 124 of the engine 36.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: January 11, 2005
    Assignee: Ford Global Technologies, Inc.
    Inventor: John Michael Miller