Patents by Inventor David A. Stringfellow

David A. Stringfellow 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: 11187639
    Abstract: Method of characterizing particles suspended in a fluid dispersant by light diffraction, comprising: obtaining measurement data from a detector element, the detector element being arranged to measure the intensity of scattered light; identifying a measurement contribution arising from light scattered by inhomogeneities in the dispersant; processing the measurement data to remove or separate the measurement contribution arising from light scattered by inhomogeneities in the dispersant; calculating a particle size distribution from the processed measurement. The detector element is one of a plurality of detector elements from which the measurement data is obtained. The detector elements are arranged to measure the intensity of scattered light at a plurality of scattering angles, the plurality of scattering angles distributed over a plurality of angles about an illumination axis.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: November 30, 2021
    Assignee: Malvern Panalytical Limited
    Inventors: Rhys Poolman, David Stringfellow, Nigel Lightfoot, Jason Cecil William Corbett
  • Publication number: 20190383718
    Abstract: Method of characterizing particles suspended in a fluid dispersant by light diffraction, comprising: obtaining measurement data from a detector element, the detector element being arranged to measure the intensity of scattered light; identifying a measurement contribution arising from light scattered by inhomogeneities in the dispersant; processing the measurement data to remove or separate the measurement contribution arising from light scattered by inhomogeneities in the dispersant; calculating a particle size distribution from the processed measurement. The detector element is one of a plurality of detector elements from which the measurement data is obtained. The detector elements are arranged to measure the intensity of scattered light at a plurality of scattering angles, the plurality of scattering angles distributed over a plurality of angles about an illumination axis.
    Type: Application
    Filed: June 13, 2019
    Publication date: December 19, 2019
    Applicant: Malvern Panalytical Limited
    Inventors: Rhys POOLMAN, David STRINGFELLOW, Nigel LIGHTFOOT, Jason Cecil William CORBETT
  • Patent number: 10422734
    Abstract: Method of characterizing particles suspended in a fluid dispersant by light diffraction, comprising: obtaining measurement data from a detector element, the detector element being arranged to measure the intensity of scattered light; identifying a measurement contribution arising from light scattered by inhomogeneities in the dispersant; processing the measurement data to remove or separate the measurement contribution arising from light scattered by inhomogeneities in the dispersant; calculating a particle size distribution from the processed measurement. The detector element is one of a plurality of detector elements from which the measurement data is obtained. The detector elements are arranged to measure the intensity of scattered light at a plurality of scattering angles, the plurality of scattering angles distributed over a plurality of angles about an illumination axis.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: September 24, 2019
    Assignee: Malvern Panalytical Limited
    Inventors: Rhys Poolman, David Stringfellow, Nigel Lightfoot, Jason Cecil William Corbett
  • Publication number: 20180038782
    Abstract: Method of characterizing particles suspended in a fluid dispersant by light diffraction, comprising: obtaining measurement data from a detector element, the detector element being arranged to measure the intensity of scattered light; identifying a measurement contribution arising from light scattered by inhomogeneities in the dispersant; processing the measurement data to remove or separate the measurement contribution arising from light scattered by inhomogeneities in the dispersant; calculating a particle size distribution from the processed measurement. The detector element is one of a plurality of detector elements from which the measurement data is obtained. The detector elements are arranged to measure the intensity of scattered light at a plurality of scattering angles, the plurality of scattering angles distributed over a plurality of angles about an illumination axis.
    Type: Application
    Filed: August 3, 2017
    Publication date: February 8, 2018
    Applicant: Malvern Instruments Limited
    Inventors: Rhys POOLMAN, David STRINGFELLOW, Nigel LIGHTFOOT, Jason Cecil William CORBETT
  • Patent number: 7869038
    Abstract: In one general aspect, a particle characterization instrument is disclosed that includes a first spatially coherent light source with a beam output aligned with an optical axis. A focusing optic is positioned along the optical axis after the coherent light source, and a sample cell is positioned along the optical axis after the focusing optic. The instrument also includes a diverging optic positioned along the optical axis after the sample cell, and a detector positioned outside of the optical axis to receive scattered light within a first range of scattering angles from the diverging optic. In another general aspect, an instrument can direct at least a portion of a first beam and at least a portion of a second beam along a same optical axis and a can receive scattered light from the sample cell resulting from interaction between the sample and either the first beam or the second beam.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: January 11, 2011
    Assignee: Malvern Instruments, Ltd.
    Inventors: Lewis Jones, Nigel Lightfoot, David Spriggs, David Stringfellow
  • Publication number: 20090122313
    Abstract: In one general aspect, a particle characterization instrument is disclosed that includes a first spatially coherent light source with a beam output aligned with an optical axis. A focusing optic is positioned along the optical axis after the coherent light source, and a sample cell is positioned along the optical axis after the focusing optic. The instrument also includes a diverging optic positioned along the optical axis after the sample cell, and a detector positioned outside of the optical axis to receive scattered light within a first range of scattering angles from the diverging optic. In another general aspect, an instrument can direct at least a portion of a first beam and at least a portion of a second beam along a same optical axis and a can receive scattered light from the sample cell resulting from interaction between the sample and either the first beam or the second beam.
    Type: Application
    Filed: August 15, 2008
    Publication date: May 14, 2009
    Inventors: Lewis Jones, Nigel Lightfoot, David Spriggs, David Stringfellow
  • Patent number: 7410999
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)-(VI) as recited throughout the application.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: August 12, 2008
    Assignees: University of North Carolinia at Chapel Hill, Georgia State University Research Foundation, Inc., Auburn University
    Inventors: Christine C. Dykstra, Maurice Daniel Givens, David A. Stringfellow, Kenny Brock, David Boykin, Arvid Kumar, W. David Wilson, Richard R. Tidwell, Chad F. Stephens
  • Patent number: 7410989
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)-(VI) as recited throughout the application.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: August 12, 2008
    Assignees: The University of North Carolina at Chapel Hill, Georgia State University Research Foundation, Inc., Auburn University
    Inventors: Christine C. Dykstra, Maurice Daniel Givens, David A. Stringfellow, Kenny Brock, David Boykin, Arvid Kumar, W. David Wilson, Richard R. Tidwell, Chad F. Stephens
  • Publication number: 20070072877
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)-(VI) as recited throughout the application.
    Type: Application
    Filed: November 20, 2006
    Publication date: March 29, 2007
    Inventors: Christine Dykstra, Maurice Givens, David Stringfellow, Kenny Brock, David Boykin, Arvind Kumar, W. Wilson, Richard Tidwell, Chad Stephens
  • Publication number: 20070072878
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)-(VI) as recited throughout the application.
    Type: Application
    Filed: November 20, 2006
    Publication date: March 29, 2007
    Inventors: Christine Dykstra, Maurice Givens, David Stringfellow, Kenny Brock, David Boykin, Arvind Kumar, W. Wilson, Richard Tidwell, Chad Stephens
  • Patent number: 7183286
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)–(VI) as recited throughout the application.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: February 27, 2007
    Assignees: The University of North Carolina at Chapel Hill, Auburn University, Georgia State University Research Foundation, Inc.
    Inventors: Christine C. Dykstra, Maurice Daniel Givens, David A. Stringfellow, Kenny Brock, David W. Boykin, Arvid Kumar, W. David Wilson, Richard R. Tidwell, Chad F. Stephens
  • Patent number: 7163955
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)–(VI) as recited throughout the application.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: January 16, 2007
    Assignees: The University of North Carolina at Chapel Hill, Georgia State University Research Foundation, Inc., Auburn University
    Inventors: Christine C. Dykstra, Maurice Daniel Givens, David A. Stringfellow, Kenny Brock, David Boykin, Arvid Kumar, W. David Wilson, Richard R. Tidwell, Chad F. Stephens
  • Publication number: 20070010533
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)-(VI) as recited throughout the application.
    Type: Application
    Filed: March 9, 2004
    Publication date: January 11, 2007
    Inventors: Christine Dykstra, Maurice Givens, David Stringfellow, Kenny Brock, David Boykin, Arvind Kumar, W. Wilson, Richard Tidwell, Chad Stephens
  • Publication number: 20060267537
    Abstract: An electronic line shaft includes a motor drive and a processing unit operable to execute a wizard for configuring the motor drive. The wizard is operable to receive mechanical characteristic data associated with the motor drive, determine a noise parameter based on the mechanical characteristic data, and determine at least one control parameter of the motor drive based on the noise parameter.
    Type: Application
    Filed: May 31, 2005
    Publication date: November 30, 2006
    Inventors: Kevin Baumann, Thomas Rehm, Richard Piefer, John Golownia, John Keller, David Stringfellow, Michael Keller
  • Publication number: 20060186841
    Abstract: A method and assembly for synchronizing machine operations, the assembly comprising a reference generator for generating a speed reference signal and a position reference signal, a plurality of slave units, each slave unit including, a mechanical device, a separate motor linked to and driving the mechanical device and a separate unit controller for controlling the unit motor, the unit controller receiving and using the reference signals to control motor operation and a synchronizer receiving the reference signals from the control signal source and simultaneously providing the reference signals to each of the slave unit controllers for use in controlling operation of the motors in a synchronized fashion.
    Type: Application
    Filed: February 28, 2006
    Publication date: August 24, 2006
    Inventors: Richard Piefer, Thomas Rehm, Kevin Baumann, Christopher Como, John Davis, David Stringfellow
  • Publication number: 20060063931
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)-(VI) as recited throughout the application.
    Type: Application
    Filed: October 28, 2005
    Publication date: March 23, 2006
    Inventors: Christine Dykstra, Maurice Givens, David Stringfellow, Kenny Brock, David Boykin, Arvind Kumar, W. David Wilson, Richard Tidwell, Chad Stephens
  • Publication number: 20030199521
    Abstract: The present invention relates to novel compounds and methods that are useful in treating members of the Flaviviridae family of viruses. Compounds of the present invention will have a structure according to Formulas (I)-(VI) as recited throughout the application.
    Type: Application
    Filed: January 11, 2002
    Publication date: October 23, 2003
    Inventors: Christine C. Dykstra, Maurice Daniel Givens, David A. Stringfellow, Kenny Brock, David Boykin, Arvind Kumar, W. David Wilson, Richard R. Tidwell, Chad E. Stephens