Patents by Inventor Daniel W. Armstrong

Daniel W. Armstrong 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: 10272364
    Abstract: The present invention relates to a novel stationary phase support for liquid chromatographic chiral separations. The specific combination of the special underlying support material and certain classes of known chiral selectors according to the invention produces far superior chiral (enantiomeric) separations than those obtained on any conventionally known supports. These chiral (enantiomeric) separations are enhanced in terms of significantly higher efficiencies (theoretical plate numbers), higher resolutions (Rs), shorter retention times and either equivalent or slightly higher selectivities than those obtained on conventional supports.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: April 30, 2019
    Assignee: AZYP, LLC
    Inventors: Daniel W. Armstrong, Zachary S. Breitbach
  • Patent number: 10265643
    Abstract: The present invention relates to superficially porous particles (SPPs), also called core-shell, porous shell or fused core particles, which are state-of-the-art support materials used in the production of HPLC columns. Hydrolytically stable, highly selective superficially porous particle (SPP) hydrophilic interaction liquid chromatographic (HILIC) stationary phases having higher efficiencies and shorter retention times than analogous stationary phases on fully porous particles (FPP) is provided.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: April 23, 2019
    Assignee: AZYP, LLC
    Inventors: Daniel W. Armstrong, Zachry S. Breitbach
  • Patent number: 9958422
    Abstract: This disclosure provides methods and devices for quantitating, separating and/or detecting water in a liquid, gas or solid sample comprising one or more chemicals, the method comprising: providing the liquid, gas or solid sample comprising water and the one or more chemicals; and exposing said liquid, gas or solid sample to at least one solid support including at least one dicationic and/or tricationic species of Formula I or II adsorbed, absorbed or immobilized on the solid support.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: May 1, 2018
    Assignee: Sigma-Aldrich Co. LLC
    Inventor: Daniel W. Armstrong
  • Publication number: 20170203234
    Abstract: The present invention relates to superficially porous particles (SPPs), also called core-shell, porous shell or fused core particles, which are state-of-the-art support materials used in the production of HPLC columns. Hydrolytically stable, highly selective superficially porous particle (SPP) hydrophilic interaction liquid chromatographic (HILIC) stationary phases having higher efficiencies and shorter retention times than analogous stationary phases on fully porous particles (FPP) is provided.
    Type: Application
    Filed: July 17, 2015
    Publication date: July 20, 2017
    Inventors: Daniel W. ARMSTRONG, Zachry S. BREITBACH
  • Publication number: 20170197156
    Abstract: The present invention relates to a novel stationary phase support for liquid chromatographic chiral separations. The specific combination of the special underlying support material and certain classes of known chiral selectors according to the invention produces far superior chiral (enantiomeric) separations than those obtained on any conventionally known supports. These chiral (enantiomeric) separations are enhanced in terms of significantly higher efficiencies (theoretical plate numbers), higher resolutions (Rs), shorter retention times and either equivalent or slightly higher selectivities than those obtained on conventional supports.
    Type: Application
    Filed: July 17, 2015
    Publication date: July 13, 2017
    Applicant: AZYP, LLC
    Inventors: Daniel W. ARMSTRONG, Zachary S BREITBACH
  • Patent number: 9302203
    Abstract: The chromatographic separation material is a cyclofructan or a derivative of cyclofructan covalently bonded to a cross-linked, organic polymer. The separation material works well in hydrophilic interaction liquid chromatography.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: April 5, 2016
    Assignees: MITSUBISHI CHEMICAL CORPORATION, AZYP, LLC
    Inventors: Haixiao Qiu, Daniel W. Armstrong, Mayumi Kiyono-Shimobe
  • Publication number: 20160041131
    Abstract: This disclosure provides methods and devices for quantitating, separating and/or detecting water in a liquid, gas or solid sample comprising one or more chemicals, the method comprising: providing the liquid, gas or solid sample comprising water and the one or more chemicals; and exposing said liquid, gas or solid sample to at least one solid support including at least one dicationic and/or tricationic species of Formula I or II adsorbed, absorbed or immobilized on the solid support.
    Type: Application
    Filed: October 22, 2015
    Publication date: February 11, 2016
    Inventor: Daniel W. Armstrong
  • Patent number: 9175006
    Abstract: The present invention relates to derivatized cyclofructan compounds, compositions comprising derivatized cyclofructan compounds, and methods of using compositions comprising derivatized cyclofructan compounds for chromatographic separations of chemical species, including enantiomers. Said compositions may comprise a solid support and/or polymers comprising derivatized cyclofructan compounds.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: November 3, 2015
    Assignee: Board of Regents, The University of Texas System
    Inventors: Daniel W. Armstrong, Ping Sun, Zachary S. Breitbach, Chunlei Wang
  • Patent number: 9168507
    Abstract: This disclosure provides methods and devices for quantitating, separating and/or detecting water in a liquid, gas or solid sample comprising one or more chemicals, the method comprising: providing the liquid, gas or solid sample comprising water and the one or more chemicals; and exposing said liquid, gas or solid sample to at least one solid support including at least one dicationic and/or tricationic species of Formula I or II adsorbed, absorbed or immobilized on the solid support.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: October 27, 2015
    Assignee: SIGMA-ALDRICH CO., LLC
    Inventor: Daniel W. Armstrong
  • Patent number: 9112474
    Abstract: An RC filter that is tunable in terms of its cut-off frequency comprising a drop placed on one or more dielectric layers, a conducting layer underneath the dielectric layer, a nonconducting layer underneath the conducting layer, and an external resistor attached to the drop via an electrode, wherein the cut-off frequency of the filter is tuned by changing the shape or composition of the drop and methods of using the filter as a detector.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: August 18, 2015
    Assignee: Board of Regents, The University of Texas System
    Inventors: Daniel W. Armstrong, Yasith S. Nanayakkara, Hyejin Moon
  • Patent number: 8980643
    Abstract: Dicationic liquid salts and methods of using such dicationic liquid salts in techniques such as ESI-MS are provided.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: March 17, 2015
    Assignee: Sigma-Aldrich Co., LLC
    Inventor: Daniel W. Armstrong
  • Patent number: 8956445
    Abstract: The present invention relates to diionic liquid salts of dicationic or dianionic molecules, as well as solvents comprising such diionic liquids and the use of such diionic liquids as the stationary phase in a gas chromatographic column.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: February 17, 2015
    Assignee: Sigma-Aldrich Co.
    Inventors: Daniel W. Armstrong, Jared Anderson
  • Patent number: 8742331
    Abstract: Imidazolium-based dicationic liquid salts and methods of using such imidazolium-based dicationic liquid salts in techniques such as ESI-MS are provided.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: June 3, 2014
    Assignee: Sigma-Aldrich, Co.
    Inventor: Daniel W. Armstrong
  • Publication number: 20140121387
    Abstract: The present invention relates to diionic liquid salts of dicationic or dianionic molecules, as well as solvents comprising diionic liquids and the use of diionic liquids as the stationary phase in a gas chromatographic column.
    Type: Application
    Filed: January 2, 2014
    Publication date: May 1, 2014
    Applicant: Sigma-Aldrich Co. LLC
    Inventors: DANIEL W. ARMSTRONG, JARED ANDERSON
  • Publication number: 20140021136
    Abstract: The chromatographic separation material is a cyclofructan or a derivative of cyclofructan covalently bonded to a cross-linked, organic polymer. The separation material works well in hydrophilic interaction liquid chromatography.
    Type: Application
    Filed: July 27, 2012
    Publication date: January 23, 2014
    Inventors: Haixiao QIU, Daniel W. ARMSTRONG, Mayumi KIYONO-SHIMOBE
  • Patent number: 8481722
    Abstract: Polyionic liquid salts are provided comprising polycationic or polyanionic molecules. Further provided are solvents comprising one or more polyionic liquid salts, and the use of such polyionic liquid salts as stationary phases in gas chromatography, and as a reagent in electrospray ionization-mass spectrometry (ESI-MS).
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: July 9, 2013
    Assignee: Sigma-Aldrich Co. LLC
    Inventors: Daniel W Armstrong, Junmin Huang
  • Publication number: 20130138359
    Abstract: An RC filter that is tunable in terms of its cut-off frequency comprising a drop placed on one or more dielectric layers, a conducting layer underneath the dielectric layer, a nonconducting layer underneath the conducting layer, and an external resistor attached to the drop via an electrode, wherein the cut-off frequency of the filter is tuned by changing the shape or composition of the drop and methods of using the filter as a detector.
    Type: Application
    Filed: August 19, 2011
    Publication date: May 30, 2013
    Applicant: Board of Regents, The University of Texas System
    Inventors: Daniel W. Armstrong, Yasith S. Nanayakkara, Hyejin Moon
  • Publication number: 20120215005
    Abstract: The present invention relates to diionic liquid salts of dicationic or dianionic molecules, as well as solvents comprising diionic liquids and the use of diionic liquids as the stationary phase in a gas chromatographic column.
    Type: Application
    Filed: April 19, 2012
    Publication date: August 23, 2012
    Applicant: SIGMA-ALDRICH CO. LLC
    Inventors: Daniel W. Armstrong, Jared Anderson
  • Publication number: 20120211696
    Abstract: The present invention relates to diionic liquid salts of dicationic or dianionic molecules, as well as solvents comprising such diionic liquids and the use of such diionic liquids as the stationary phase in a gas chromatographic column.
    Type: Application
    Filed: March 30, 2012
    Publication date: August 23, 2012
    Applicant: SIGMA-ALDRICH CO. LLC
    Inventors: Daniel W. Armstrong, Jared Anderson
  • Patent number: 8182581
    Abstract: The present invention relates to diionic liquid salts of dicationic or dianionic molecules, as well as solvents comprising diionic liquids and the use of diionic liquids as the stationary phase in a gas chromatographic column.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: May 22, 2012
    Assignee: Sigma-Aldrich Co. LLC
    Inventors: Daniel W. Armstrong, Jared Anderson