Patents by Inventor David M. John

David M. John 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: 20190267810
    Abstract: Methods and systems for HVDC and/or MVDC power transmission and/or distribution, using circuit breakers where a series-connected stack of fully-bidirectional bipolar junction transistors is the initial interrupter in the current path. Preferably these transistors are operated with two pre-turnoff phases, to deplete minority carrier population and thus provide a faster transition to complete turnoff.
    Type: Application
    Filed: February 27, 2019
    Publication date: August 29, 2019
    Applicant: Ideal Power, Inc.
    Inventor: David M. Johns
  • Patent number: 9237867
    Abstract: A cartridge (700) for insertion into a meter comprises: a plurality of cartridge brackets (704) disposed on an inner wall (703) of the cartridge; a spindle (702) mounted so as to be rotatable within the cartridge and movable longitudinally in first and second directions within the cartridge; and a plurality of testing members (708) each arranged to be supported temporarily by at least one of the plurality of cartridge brackets, each of the testing members including) a hole (306) through which the spindle is located, the spindle having a plurality of spindle brackets (706) disposed on an outer surface thereof, each spindle bracket being movable between first and second positions.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: January 19, 2016
    Assignee: Sanofi-Aventis Detuschland GmbH
    Inventors: Frank Richter, Ross MacArthur, Elizabeth Verity Wolseley-Hext, Joseph David Cowan, Lee Thomas Smith, David M. John Mills
  • Publication number: 20150038817
    Abstract: A cartridge (700) for insertion into a meter comprises: a plurality of cartridge brackets (704) disposed on an inner wall (703) of the cartridge; a spindle (702) mounted so as to be rotatable within the cartridge and movable longitudinally in first and second directions within the cartridge; and a plurality of testing members (708) each arranged to be supported temporarily by at least one of the plurality of cartridge brackets, each of the testing members including) a hole (306) through which the spindle is located, the spindle having a plurality of spindle brackets (706) disposed on an outer surface thereof, each spindle bracket being movable between first and second positions.
    Type: Application
    Filed: March 6, 2013
    Publication date: February 5, 2015
    Inventors: Frank Richter, Ross MacArthur, Elizabeth Verity Wolseley-Hext, Joseph David Cowan, Lee Thomas Smith, David M. John Mills
  • Patent number: 8467208
    Abstract: The magnitude and wave shape of instantaneous alternating current and power delivered from a converter's single phase alternating current output is controlled by a closed loop power control scheme independent of the direct current input voltage to the converter. A fast averaging methodology for the value of control magnitude and wave shape of the instantaneous power delivered from the alternating current output can be used in the closed loop power control scheme to limit the magnitude of delivered power. The closed loop power control scheme can be used in both power grid-tied applications and stand-alone non-powered load line applications.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: June 18, 2013
    Assignee: Excelitas Technologies Corp.
    Inventor: David M. Johns
  • Publication number: 20110173932
    Abstract: A method for protection of underwater structures and earthen surfaces. A biodegradable bag is filled with particulate material, such as a cement mixture, and placed underwater so as to protect an underwater structure from damage. The bag has a multi-layer wall, with an outer layer of a biodegradable fabric such as burlap, and an inner layer of a biodegradable material which is permeable to water yet which will not permit very fine solids to pass through the material. A suitable inner layer material is heavy kraft paper. After placement underwater, water penetrates the wall layers and hydrates the cement, eventually forming a firm mass. Another embodiment of the bag comprises a filler tube formed from the bag wall material, which extends into the interior of the bag sufficiently far that escape of the particulate material is minimized during the filling of the bag.
    Type: Application
    Filed: January 18, 2011
    Publication date: July 21, 2011
    Inventor: David M. John
  • Patent number: 7859872
    Abstract: The magnitude and wave shape of instantaneous power draw from a single phase alternating current power source to a power converter is controlled by a closed loop power control scheme independent of the direct current output voltage of the converter. A fast averaging methodology for the value of control magnitude and wave shape of the instantaneous power draw by the converter from the alternating current source can be used in the closed loop power control scheme to limit the magnitude of power draw.
    Type: Grant
    Filed: May 24, 2009
    Date of Patent: December 28, 2010
    Assignee: Kaiser Systems, Inc.
    Inventor: David M. Johns
  • Patent number: 7209373
    Abstract: A high voltage pulse generator utilizes an even number of Marx cells using L-C inversion topology. Each Marx cell is associated with an individual inverter transformer having a primary winding connected to the output of an ac power supply such as a series resonant inverter. The secondary of each inverter transformer is half-wave rectified to charge the energy storage capacitors in each Marx cell. A distributed voltage sensing scheme can be provided for accurate feedback to the inverter's controller. An inductive element can be used to achieve a magnetic diode effect in the L-C inversion circuit to reduce component stress and improve efficiency. A transformer-coupled floating gate drive circuit is used to provide local power conditioning and trigger timing for discharge of the energy storage capacitors.
    Type: Grant
    Filed: December 28, 2004
    Date of Patent: April 24, 2007
    Assignee: Kaiser Systems, Inc.
    Inventors: Jeffrey Alan Oicles, David M. Johns
  • Patent number: 6882674
    Abstract: The present invention provides an excimer laser capable of producing a high quality pulsed laser beam at pulse rates of about 4,000 Hz at pulse energies of about 5 mJ or greater. A preferred embodiment is an ArF excimer laser specifically designed as a light source for integrated circuit lithography. An improved wavemeter with special software monitors output beam parameters and controls a very fast PZT driven tuning mirror and the pulse power charging voltage to maintain wavelength and pulse energy within desired limits. In a preferred embodiment two fan motors drive a single tangential fan which provides sufficient gas flow to clear discharge debris from the discharge region during the approximately 0.25 milliseconds between pulses.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: April 19, 2005
    Assignee: Cymer, Inc.
    Inventors: Christian J. Wittak, William N. Partlo, Richard L. Sandstrom, Paul C. Melcher, David M. Johns, Robert B. Saethre, Richard M. Ness, Curtis L. Rettig, Robert A. Shannon, Richard C. Ujazdowski, Shahryar Rokni, Scott T. Smith, Stuart L. Anderson, John M. Algots, Ronald L. Spangler, Igor V. Fomenkov, Thomas D. Steiger, Jerome A. Emilo, Clay C. Titus, Alex P. Ivaschenko, Paolo Zambon, Gamaralalage G. Padmabandu, Mark S. Branham, Sunjay Phatak, Raymond F. Cybulski
  • Patent number: 6757316
    Abstract: The present invention provides an excimer laser capable of producing a high quality pulsed laser beam at pulse rates of about 4,000 Hz at pulse energies of about 5 mJ or greater. A preferred embodiment is an ArF excimer laser specifically designed as a light source for integrated circuit lithography. An improved wavemeter with special software monitors output beam parameters and controls a very fast PZT driven tuning mirror and the pulse power charging voltage to maintain wavelength and pulse energy within desired limits. In a preferred embodiment two fan motors drive a single tangential fan which provides sufficient gas flow to clear discharge debris from the discharge region during the approximately 0.25 milliseconds between pulses.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: June 29, 2004
    Assignee: Cymer, Inc.
    Inventors: Peter C. Newman, Thomas P. Duffey, William N. Partlo, Richard L. Sandstrom, Paul C. Melcher, David M. Johns, Robert B. Saethre, Vladimir B. Fleurov, Richard M. Ness, Curtis L. Rettig, Robert A. Shannon, Richard C. Ujazdowski, Shahryar Rokni, Xiaojiang J. Pan, Vladimir Kulgeyko, Scott T. Smith, Stuart L. Anderson, John M. Algots, Ronald L. Spangler, Igor V. Fomenkov
  • Publication number: 20030118072
    Abstract: The present invention provides an excimer laser capable of producing a high quality pulsed laser beam at pulse rates of about 4,000 Hz at pulse energies of about 5 mJ or greater. A preferred embodiment is an ArF excimer laser specifically designed as a light source for integrated circuit lithography. An improved wavemeter with special software monitors output beam parameters and controls a very fast PZT driven tuning mirror and the pulse power charging voltage to maintain wavelength and pulse energy within desired limits. In a preferred embodiment two fan motors drive a single tangential fan which provides sufficient gas flow to clear discharge debris from the discharge region during the approximately 0.25 milliseconds between pulses.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 26, 2003
    Inventors: Christian J. Wittak, William N. Partlo, Richard L. Sandstrom, Paul C. Melcher, David M. Johns, Robert B. Saethre, Richard M. Ness, Curtis L. Rettig, Robert A. Shannon, Richard C. Ujazdowski, Shahryar Rokni, Scott T. Smith, Stuart L. Anderson, John M. Algots, Ronald L. Spangler, Igor V. Fomenkov, Thomas D. Steiger, Jerome A. Emilo, Clay C. Titus, Alex P. Ivaschenko, Paolo Zambon, Gamaralalage G. Padmabandu, Mark S. Branham, Sunjay Phatak, Raymond F. Cybulski
  • Patent number: 6435787
    Abstract: A method of manufacturing an inflatable dunnage bag having a wall construction of two integrally fused layers of thermoplastic polymer, the outer layer of which is a sleeve of strips of woven polymer, the inner of layer of which is a continuous layer of gas impervious polymer. The ends of the sleeve are sealed against the escape of gas. The wall of the bag has a valve for the admittance of gas to the interior of the bag. The bag is formed by deposition of a continuous molten layer of gas impervious polymer to a sleeve of strips of woven polymer, installing a valve for admittance of gas into the wall of the sleeve and forming a gas tight seal at the ends of the sleeve. Deposition of the continuous layer of gas impervious polymer may be a two-step process wherein a molten layer of gas impervious polymer is deposited to one exterior side of the flattened sleeve, then to the other exterior side of the flattened sleeve and the sleeve turned “inside-out”.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: August 20, 2002
    Inventor: David M. John
  • Publication number: 20020021728
    Abstract: The present invention provides an excimer laser capable of producing a high quality pulsed laser beam at pulse rates of about 4,000 Hz at pulse energies of about 5 mJ or greater. A preferred embodiment is an ArF excimer laser specifically designed as a light source for integrated circuit lithography. An improved wavemeter with special software monitors output beam parameters and controls a very fast PZT driven tuning mirror and the pulse power charging voltage to maintain wavelength and pulse energy within desired limits. In a preferred embodiment two fan motors drive a single tangential fan which provides sufficient gas flow to clear discharge debris from the discharge region during the approximately 0.25 milliseconds between pulses.
    Type: Application
    Filed: May 11, 2001
    Publication date: February 21, 2002
    Inventors: Peter C. Newman, Thomas P. Duffey, William N. Partlo, Richard L. Sandstrom, Paul C. Melcher, David M. Johns, Robert B. Saethre, Vladimir B. Fleurov, Richard M. Ness, Curtis L. Rettig, Robert A. Shannon, Richard C. Ujazdowski, Shahryar Rokni, Xiaojiang J. Pan, Vladimir Kulgeyko, Scott T. Smith, Stuart L. Anderson, John M. Algots, Ronald L. Spangler, Igor V. Fomenkov
  • Patent number: 6327286
    Abstract: An improvement over prior art voltage timing compensation circuits is achieved by incorporating a function generator to provide a more accurate non-linear compensation to pulse timing delay, which is typically a non-linear function of voltage. An improvement over prior art temperature timing compensation circuits is achieved by providing for actual temperature measurements to be made and used to drive the timing compensation circuitry for a more accurate temperature timing compensation than provided by prior art temperature synthesis, while still using a relatively simple compensating circuit. In some embodiments a timing compensation circuit combines both voltage and temperature timing compensation.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: December 4, 2001
    Assignee: Cymer, Inc.
    Inventors: Richard M. Ness, William N. Partlo, Richard L. Sandstrom, David M. Johns
  • Patent number: 6322303
    Abstract: An inflatable dunnage bag having a wall construction of two integrally fused layers of thermoplastic polymer, the outer layer of which is a sleeve of strips of woven polymer, the inner of layer of which is a continuous layer of gas impervious polymer. The ends of the sleeve are sealed against the escape of gas. The wall of the bag has a means for the admittance of gas to the interior of the bag. The bag is formed by deposition of a continuous molten layer of gas impervious polymer to a sleeve of strips of woven polymer, installing a means for admittance of gas into the wall of the sleeve and forming a gas tight seal at the ends of the sleeve. Deposition of the continuous layer of gas impervious polymer may be a two-step process wherein a molten layer of gas impervious polymer is deposited to one exterior side of the flattened sleeve, then to the other exterior side of the flattened sleeve and the sleeve turned “inside-out”.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: November 27, 2001
    Inventor: David M. John