Patents by Inventor Christopher A. Pohl

Christopher A. Pohl 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: 20220388541
    Abstract: A safety module for a secured drive control of an automated drive system is configured to receive encoder data sent from an encoder unit to a drive unit, based on an encoder protocol via a protocol active unit. The safety module is configured to forward the encoder data from the protocol active unit to a safety logic and a protocol passive unit, check the forwarded encoder data with the aid of the safety logic for correspondence with predetermined safety criteria relating to operation of a motor unit, and transmit the forwarded encoder data via the protocol passive unit to the drive unit, in respective data packets based on the encoder protocol. The safety module can stop operation of the motor unit with the aid of the safety logic, if the encoder data does not correspond to the predetermined safety criteria. A corresponding drive system and automation system are also provided.
    Type: Application
    Filed: August 8, 2022
    Publication date: December 8, 2022
    Inventors: Christopher Pohl, Andreas Kathöfer, Frank Sieweke, Robert Zutz
  • Patent number: 11504707
    Abstract: Ion exchange stationary phases are prepared with diprimary diamines for applications such as separating samples that contain polyvalent anions. The ion exchange stationary phase includes a series of condensation polymer reaction products bound to a substrate. The condensation polymer products are formed with diprimary diamines and polyepoxide compounds. The ion exchange stationary phases described herein are capable of separating monovalent and highly polyvalent anions relatively quickly with relatively low eluent concentrations in one chromatographic run.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: November 22, 2022
    Assignee: Dionex Corporation
    Inventor: Christopher A. Pohl
  • Publication number: 20220339618
    Abstract: Ion exchange stationary phases are prepared with diprimary diamines for applications such as separating samples that contain polyvalent anions. The ion exchange stationary phase includes a series of condensation polymer reaction products bound to a substrate. The condensation polymer products are formed with diprimary diamines and polyepoxide compounds. The ion exchange stationary phases described herein are capable of separating monovalent and highly polyvalent anions relatively quickly with relatively low eluent concentrations in one chromatographic run.
    Type: Application
    Filed: June 27, 2022
    Publication date: October 27, 2022
    Inventor: Christopher A Pohl
  • Publication number: 20220315720
    Abstract: A coated substrate that comprises a polyolefin substrate having a functional polymer layer disposed thereon. The polyolefin substrate has a flow through pore structure with a pore size ranging from about 5 microns to about 250 microns. The functional polymer layer has a thickness ranging from about 1 micron to about 20 microns and a layer pore structure having a pore size ranging from about 1 nm to about 100 nm.
    Type: Application
    Filed: December 22, 2021
    Publication date: October 6, 2022
    Inventors: John M. Riviello, Christopher A. Pohl
  • Patent number: 11448626
    Abstract: An ion exchange chromatographic packing material is described that includes support resin particles and a copolymer grafted to the support resin particles. The copolymer includes polymerized functional monomers such as a first ion exchange group monomer and a second ion exchange group monomer. At a first pH, the first ion exchange group monomer is configured to have a first charge at a first pH, and the second ion exchange group monomer is configured to have a net neutral charge. At a second pH, the first ion exchange group monomer is configured to have the first charge at a second pH, and the second ion exchange group monomer is configured to have a second charge at the second pH where the first charge and second charge both have a same polarity.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: September 20, 2022
    Assignee: DIONEX CORPORATION
    Inventors: Manikandan Jayaraman, Christopher A. Pohl, Charanjit Saini
  • Patent number: 11400444
    Abstract: Open tubular capillary columns for liquid and ion chromatography, based upon an ionically impermeable polyolefin capillary having a bore with a sulfonate-group- or amine-group-functionalized internal surface. The capillary columns may include a coating of ion exchanging nanoparticles electrostatically bound to the functionalized internal surface. The capillary columns may be made by exposing the interior surface to a sulfonating reagent comprising chlorosulfonic acid (ClSO3H), preferably from 85 wt % to 95 wt % chlorosulfonic acid at a process temperature of 20 to 25° C. The interior surface may be subsequently exposed to an asymmetrical diamine to form a sulfonic mid-linkage to the diamine, i.e., to form a sulfonamide-linked, amine-group-functionalized internal surface. The coating may be provided by subsequently exposing the interior surface to an aqueous suspension of ion exchanging nanoparticles to electrostatically bond the ion exchanging nanoparticles to the functionalized internal surface.
    Type: Grant
    Filed: September 16, 2020
    Date of Patent: August 2, 2022
    Assignees: Board of Regents, University of Texas System, Dionex Corporation
    Inventors: Purnendu K. Dasgupta, Weixiong Huang, Christopher A. Pohl
  • Publication number: 20220205942
    Abstract: An electrochemical cell comprises a chamber, an inlet port, an outlet port, an electrode port, and a counter electrode. The inlet port is configured to allow flow of a liquid into the chamber and through an inlet opening toward the working electrode, and the outlet port is configured to allow flow of a liquid out of the chamber and through an outlet opening. The device is configured so that a force applied to the working electrode slides the first end face of the working electrode to a distance from a face of the inlet opening due to the balancing force of a fluid flowing out of the inlet opening. The device may be used in a method for analyzing an analyte, such as one or more amino acids in a liquid sample.
    Type: Application
    Filed: December 27, 2021
    Publication date: June 30, 2022
    Inventors: Purnendu Dasgupta, Charles P. Shelor, Kannan Srinivasan, Christopher A. Pohl
  • Publication number: 20220097024
    Abstract: A carrier for adsorption a compound, comprising a support; and a shrink-fitted monolithic body attached to and surrounding at least a portion of the support. The monolithic body can be porous and configured to bind compounds in a solution either for the isolation or depletion of the compounds from the solution.
    Type: Application
    Filed: December 8, 2021
    Publication date: March 31, 2022
    Applicant: DIONEX CORPORATION
    Inventors: Christopher A. POHL, John M. RIVIELLO
  • Publication number: 20220043918
    Abstract: A computing device, in particular, for a control unit of a motor vehicle. The computing device is configured to receive messages from at least one external unit. The computing device is configured to store the received messages at least temporarily and to transmit a plurality of the received messages to a cryptographic module, which is configured to execute a check of the transmitted messages.
    Type: Application
    Filed: November 27, 2019
    Publication date: February 10, 2022
    Applicant: Robert Bosch GmbH
    Inventors: Christopher Pohl, Frederic Stumpf
  • Patent number: 11207659
    Abstract: A carrier for adsorption a compound, comprising a support; and a shrink-fitted monolithic body attached to and surrounding at least a portion of the support. The monolithic body can be porous and configured to bind compounds in a solution either for the isolation or depletion of the compounds from the solution.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: December 28, 2021
    Assignee: DIONEX CORPORATION
    Inventors: Christopher A. Pohl, John M. Riviello
  • Publication number: 20210389289
    Abstract: Systems and methods for inhibiting translocation of ions across ion exchange barriers include an eluent generator having an ion source reservoir with a first electrode, an eluent generation chamber with a second electrode, an ion exchange barrier disposed therebetween, and means for reversing the polarity of a voltage or current applied across the first and second electrodes. A first polarity voltage or current applied across the electrodes generates an electric field that promotes translocation of eluent counter ions from the reservoir across the barrier, where the counter ions combine with eluent ions electrolytically generated in the chamber. By reversing the polarity of the voltage or current across the electrodes, the resulting electric field inhibits translocation of counter ions across the barrier from the reservoir into the chamber. Reverse voltage or current bias reduces counter ion concentration in the resting chamber to prevent exhaustion of ion suppressor capacity during start up.
    Type: Application
    Filed: August 27, 2021
    Publication date: December 16, 2021
    Inventors: Kannan Srinivasan, Mrinal Sengupta, Yan Liu, Christopher A. Pohl, Nebojsa Avdalovic
  • Patent number: 11198117
    Abstract: An ion exchange chromatography column contains an ion exchange stationary phase that includes a charged substrate, a plurality of first particles, and a plurality of second particles. The plurality of first particles each include first ion exchange groups and the first particles are ionically bound to the charged substrate. The plurality of second particles each include second ion exchange groups and the second particles are ionically bound to the charged substrate. The first particles having a first ion exchange group density, and the second particles having a second ion exchange group density. The first ion exchange group density is greater than the second ion exchange group density. The ion exchange chromatography column has a number of zones connected in series where each zone can have a varying level of first ion exchange groups and second ion exchange group from the inlet zone to the outlet zone.
    Type: Grant
    Filed: November 4, 2019
    Date of Patent: December 14, 2021
    Assignee: Dionex Corporation
    Inventor: Christopher A. Pohl
  • Publication number: 20210308599
    Abstract: An ion exchange resin for use as a stationary phase in an ion chromatography column. The ion exchange resin has a negatively charged substrate particle, a positively charged polymer layer bound to the negatively charged substrate particle, a linker, and an ion exchange group. The ion exchange group includes a sulfonamide group and an amine, in which the ion exchange group is coupled to the positively charged polymer layer via the linker. When the sulfonamide is in a neutral form, a positively charged amine group provides retention: while when the sulfonamide is in an anionic form, the sulfonamide anion becomes a counter ion to the positively charged amine group, forming a zwitterion that reduces retention at that site. Accordingly, the retention time is able to be controlled by adjusting the mobile phase pH.
    Type: Application
    Filed: June 22, 2021
    Publication date: October 7, 2021
    Inventors: Melvin Hatch, Christopher A. Pohl, Manikandan Jayaraman
  • Patent number: 11105782
    Abstract: Systems and methods for inhibiting translocation of ions across ion exchange barriers include an eluent generator having an ion source reservoir with a first electrode, an eluent generation chamber with a second electrode, an ion exchange barrier disposed therebetween, and means for reversing the polarity of a voltage or current applied across the first and second electrodes. A first polarity voltage or current applied across the electrodes generates an electric field that promotes translocation of eluent counter ions from the reservoir across the barrier, where the counter ions combine with eluent ions electrolytically generated in the chamber. By reversing the polarity of the voltage or current across the electrodes, the resulting electric field inhibits translocation of counter ions across the barrier from the reservoir into the chamber. Reverse voltage or current bias reduces counter ion concentration in the resting chamber to prevent exhaustion of ion suppressor capacity during start up.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: August 31, 2021
    Assignee: Dionex Corporation
    Inventors: Kannan Srinivasan, Mrinal Sengupta, Yan Liu, Christopher A. Pohl, Nebojsa Avdalovic
  • Publication number: 20210178334
    Abstract: An electrolytic eluent generator includes an electrolyte reservoir, an eluent generation chamber, and an ion exchange membrane stack. The electrolyte reservoir includes a chamber containing an aqueous electrolyte solution including an electrolyte and a surfactant; and a first electrode. The eluent generation chamber including a second electrode. The ion exchange connector includes an ion exchange membrane stack, and a compression block.
    Type: Application
    Filed: December 16, 2019
    Publication date: June 17, 2021
    Inventors: Zhongqing LU, Yan LIU, Christopher A. POHL, Jinhua CHEN, Jun CHENG
  • Publication number: 20210164949
    Abstract: A vial cap for removing a matrix component from a liquid sample is described. The vial cap includes a cap body, an inlet portion, and an outlet portion. The cap body is configured to have a slidable gas and liquid seal with a side wall of a sample vial. The inlet portion includes a counterbore section that holds a filter plug. The filter plug includes a polyethylene resin and a material selected from the group consisting of an ion exchange material and a reversed-phase material. The vial cap is adapted for solid phase extraction for use in an autosampler with a plurality of sample vials.
    Type: Application
    Filed: February 12, 2021
    Publication date: June 3, 2021
    Inventors: Christopher A. POHL, Rosanne W. SLINGSBY
  • Publication number: 20210163520
    Abstract: An anion exchange for separating a plurality of carbohydrates includes a negatively charged substrate particle. A base polymer layer includes a first plurality of quaternary amines. The polyalkylpolyamine polymer layer is covalently attached to the base condensation polymer layer. The polyalkylpolyamine polymer layer includes a polymeric branch structure that includes a second plurality of quaternary amines. A density of the second plurality of quaternary amines increases in a direction away from the base condensation polymer layer. The anion exchange stationary phase does not have a hydroxy group spaced apart from any one of the first or the second plurality of quaternary amines by an ethyl group.
    Type: Application
    Filed: February 15, 2021
    Publication date: June 3, 2021
    Inventors: Christopher A. Pohl, Jinhua Chen
  • Patent number: 11022585
    Abstract: A plurality of chromatograms is run using a salt gradient with a range of constant pH values or using a pH gradient with a range of constant salt concentrations. A chromatography optimization algorithm can be used to identify at least one salt gradient chromatogram or at least one pH gradient chromatogram to establish optimized buffer conditions. The chromatography optimization algorithm can include a total number of peaks algorithm, a peak-to-valley algorithm, and/or a peak capacity algorithm.
    Type: Grant
    Filed: June 9, 2019
    Date of Patent: June 1, 2021
    Assignee: Dionex Corporation
    Inventors: Shanhua Lin Liehr, Jung Un Baek, Christopher A. Pohl, Mark Lee Tracy, Xiadong Liu
  • Publication number: 20210129128
    Abstract: An ion exchange chromatography column contains an ion exchange stationary phase that includes a charged substrate, a plurality of first particles, and a plurality of second particles. The plurality of first particles each include first ion exchange groups and the first particles are ionically bound to the charged substrate. The plurality of second particles each include second ion exchange groups and the second particles are ionically bound to the charged substrate. The first particles having a first ion exchange group density, and the second particles having a second ion exchange group density. The first ion exchange group density is greater than the second ion exchange group density. The ion exchange chromatography column has a number of zones connected in series where each zone can have a varying level of first ion exchange groups and second ion exchange group from the inlet zone to the outlet zone.
    Type: Application
    Filed: November 4, 2019
    Publication date: May 6, 2021
    Inventor: Christopher A. Pohl
  • Patent number: 10921298
    Abstract: A vial cap for removing a matrix component from a liquid sample is described. The vial cap includes a cap body, an inlet portion, and an outlet portion. The cap body is configured to have a slidable gas and liquid seal with a side wall of a sample vial. The inlet portion includes a counterbore section that holds a filter plug. The filter plug includes a polyethylene resin and a material selected from the group consisting of an ion exchange material and a reversed-phase material. The vial cap is adapted for solid phase extraction for use in an autosampler with a plurality of sample vials.
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: February 16, 2021
    Assignee: DIONEX CORPORATION
    Inventors: Christopher A. Pohl, Rosanne W. Slingsby