Gradient Patents (Class 73/23.26)
  • Patent number: 11255827
    Abstract: Certain configurations described herein are directed to gas chromatography devices. In some instances, the gas chromatography devices may comprise at least one heating device which can be moved along a chromatography column to provide a thermal gradient to the chromatography column. In other instances, the gas chromatography devices may comprise a heating device that can receive a moving chromatography column to provide a thermal gradient to the chromatography column. The gas chromatography devices may be configured as portable devices which can be used to perform remote analyses.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: February 22, 2022
    Assignee: PerkinElmer Health Sciences, Inc.
    Inventors: Edgar D Lee, Nathan L Porter, Randall W Waite
  • Patent number: 10935524
    Abstract: A gas chromatograph device includes an inductively heated column configured for gas chromatography. The gas chromatograph includes a column configured for gas chromatography and an inductive heating source. The inductive heating source is configured to directly or indirectly heat the column. The inductive heating source includes an inductive heating element or coil. The inductive heating element or coil is configured to induce a current directly or indirectly in the column. Wherein, the column in the gas chromatograph is inductively heated via the inductive heating source.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: March 2, 2021
    Assignee: CEM CORPORATION, LUCIDITY DIVISION
    Inventors: Alyssa Whitney Sabolis, Michael John Collins, Jr., Michael Craig Davis, Daniel Charles Scheid, Brian Thomas Unites, Richard Michael Chapman
  • Patent number: 10753912
    Abstract: A gas chromatograph includes a sample introduction portion and a heater block. A contact portion is fit into a first recess of a main body of the sample introduction portion. The heater block is fixed to and positioned with respect to the main body of the sample introduction portion by directly coming into contact with the contact portion provided on the main body of the sample introduction portion. For this reason, the heater block may be securely positioned with respect to the sample introduction portion.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: August 25, 2020
    Assignee: Shimadzu Corporation
    Inventors: Yuki Komori, Ryo Takechi
  • Patent number: 10578592
    Abstract: A method for estimating temperature variation due to pressure drop in a mobile phase passing through a column in a high efficiency chromatographic separation system is provided. The method includes constructing a temperature triangle using a pressure-temperature thermodynamic plot of the mobile phase having isenthalpic curves of the mobile phase. Applications of the method include development of chromatographic methods for minimizing band broadening due to temperature variation and methods to mitigate the extent of temperature variation due to the pressure drop.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: March 3, 2020
    Inventor: Abhijit Tarafder
  • Patent number: 9921191
    Abstract: A gas chromatographic (GC) unit or module may include one or more microfluidic devices, a GC column, and a flow controller (FC) comprising an FC input port for controlling fluid flows and pressures. The GC unit may be reconfigurable to provide different functionalities. The GC unit may be fluidly coupled to various other fluidic devices, such as other GC units, sample inlets, GC detectors, and the like. Multiple GC units and other fluidic devices may be utilized to build GC devices and associated systems of flexible, reconfigurable, and scalable architecture, thereby enabling a variety of modes of operation useful for present and future GC method development.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: March 20, 2018
    Assignee: Agilent Technologies, Inc.
    Inventors: Xiao-Sheng Guan, Qiang Xu
  • Patent number: 8443589
    Abstract: A diesel oxidation catalyst (DOC) testing system includes a DOC that is located in an exhaust system of a vehicle. A control module verifies proper operation of the DOC during a post-fuel injection process in an engine of the vehicle. The control module computes a predicted temperature of exhaust gases at an output of the DOC that corresponds with proper operation of the DOC during the post-fuel injection process, determines an actual temperature of the exhaust gases during the post-fuel injection process, and activates an alarm indicator when a difference between the predicted temperature and the actual temperature is greater than a first predetermined value. A first temperature sensor is located downstream from the DOC in the exhaust system. The first temperature sensor communicates with the control module, generates the actual temperature, and transmits the actual temperature to the control module.
    Type: Grant
    Filed: April 4, 2005
    Date of Patent: May 21, 2013
    Inventors: Chuan He, Richard B. Jess, Jay Tolsma, John F. Van Gilder, Wenbo Wang
  • Patent number: 7633386
    Abstract: A detection system in which a single sensor is employed to detect an extensive range of a parameter. The output signal from the sensor is fed to the input of the electrical circuit, having a feedback loop, wherein the electrical circuit has a non-linear transfer characteristic. The non-linear transfer characteristic is achieved by changing the behavior of the feedback loop of the electrical circuit at a predetermined level of input signal. The output of the circuit has a proportional relationship with the input until the input signal reaches this predetermined value, whereupon the behaviors of the feedback loop changes and the relationship of the output to the input of the circuit changes. While the input signal is above the predetermined value, the output of the circuit has a linear but disproportionate relationship with the input at a gradient different to that when the input signal is below the predetermined value.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: December 15, 2009
    Assignee: Thorn Security Limited
    Inventor: Steven Ian Bennett
  • Patent number: 7458206
    Abstract: An exhaust gas purification system determines a deposited state of particulate matters based on a differential pressure across a diesel particulate filter (DPF) sensed by a differential pressure sensor. An electronic control unit (ECU) of the system prohibits the determination of the deposited state of the particulate matters, which is performed based on the differential pressure, when uniformity of temperature distribution inside the DPF is low. The ECU estimates temperatures at multiple points inside the DPF distant from an inlet along a direction of a flow of exhaust gas based on the temperature at the inlet sensed by an exhaust gas temperature sensor disposed immediately upstream of the DPF. The ECU determines the uniformity of the temperature distribution inside the DPF based on a range of the temperatures at the multiple points.
    Type: Grant
    Filed: January 11, 2005
    Date of Patent: December 2, 2008
    Assignee: Denso Corporation
    Inventors: Shigeto Yahata, Makoto Saito, Kazuharu Tochikawa
  • Patent number: 7225085
    Abstract: A precision gas flow meter that is capable of measuring small flow rates of gasses precisely in the range of 0.01 to 10 L per minute. The meter is designed to measure the gas flow in small volume increments of predetermined value, and therefore can be used to measure a gas flow that is continuous or discontinuous. The flow meter can be used to measure the gas production rates from many processes, including biological reactors, chemical reactors, and thermal-chemical reactors. The device can also be used to meter the gases that are required in small or minute volumes.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: May 29, 2007
    Assignee: The Regents of the University of California
    Inventors: Ruihong Zhang, Zhongli Pan
  • Patent number: 6883365
    Abstract: A focusing device for volatile and semi-volatile organic compounds in the gaseous phase, comprising a support structure, a container for said organic compounds, a cooling element and a heating element for their transfer to the analysis system, characterized in that said cooling element and said heating element are positioned in two separate regions of said support structure and form a single block movable relative to said container.
    Type: Grant
    Filed: August 7, 2001
    Date of Patent: April 26, 2005
    Assignee: Dani Strumentazione Analitica S.p.A.
    Inventor: Umberto Saini Fasanotti
  • Patent number: 6849238
    Abstract: The measuring sensor, particularly a lambda probe, has a ceramic sensor member retained at a high temperature during measuring operation. It is shielded from water droplets, carried along in the gas to be analyzed, by a heated protective housing, permeable for the gas to be analyzed, by which water droplets carried along in the direction of the sensor member are evaporated before reaching the sensor member. In this way, the water droplets are unable to cause any shock-like temperature drops at spots on the surface of the sensor member or material flaking.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: February 1, 2005
    Assignee: Robert Bosch GmbH
    Inventors: Helmut Weyl, Hans-Martin Wiedenmann
  • Patent number: 6776025
    Abstract: The invention is a gas chromatograph that includes a mechanism to heat the carrier gas to a temperature higher than that of the columns through which it flows. The carrier gas may be temperature programmed to achieve much the same results as the known technique of temperature programming the column.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: August 17, 2004
    Assignee: Daniel Industries, Inc.
    Inventor: Teresa Lechner-Fish
  • Patent number: 6497138
    Abstract: The present disclosure relates to a gas chromatograph having a plurality of layers or channels. The chromatograph typically comprises an inlet that receives a sample to be analyzed, a column disposed in each of the plurality of chromatograph layers, each column being in fluid communication with and downstream from the inlet and having a stationary phase coating its inner surfaces, and a detector in fluid communication with and downstream from at least one of the columns. In a preferred arrangement, the chromatograph includes a pre-column disposed in each of the chromatograph layers upstream of the columns, each pre-column being in fluid communication with the inlet and having a stationary phase coating its inner surfaces.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: December 24, 2002
    Assignee: Agilent Technologies, Inc.,
    Inventors: Mahmoud Farid Abdel-Rahman, Carl A. Myerholtz