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公开(公告)号：US11899033B2
公开(公告)日：2024-02-13
申请号：US15827367
申请日：2017-11-30
申请人： Leco Corporation
发明人： Larry S. O'Brien
摘要： The analyzer of the present invention is specifically adapted to provide moisture determinations for foods and other agricultural material. It allows the operator to introduce a precise weight of sample into a crucible in a closed furnace in a controlled environment through an access port in the furnace cover. The access port in the cover can be tapered to allow easy access to an underlying aligned crucible and allow an operator to add and remove sample material from the crucible until a precise desired sample weight is reached as measured by a balance within the furnace. The access port is enclosed by an insulated cover after the samples are sequentially placed in the crucibles.
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公开(公告)号：US11899032B2
公开(公告)日：2024-02-13
申请号：US17303649
申请日：2021-06-03
申请人： Leco Corporation
发明人： Peter M. Willis , Bradley R. Rush
IPC分类号： G01N35/10 , F16K11/074 , G01N31/12 , G01N1/44
CPC分类号： G01N35/1097 , F16K11/074 , G01N31/12 , G01N1/44
摘要： A device is provided for use in analytical instrumentation that provides continuous transfer of a known molar quantity of gas from a source having an unknown gas mixture and varying pressure. In addition to the upstream and downstream paths of typical flow control devices, the device has a midstream path to introduce a carrier gas at a known elevated pressure. The device has at least three equal-volume ballast vessels and a valve arrangement to cycle the ballasts through at least three states: fill, equilibrate, and empty. The ballasts fill with the upstream gas, pressurize and equilibrate at the midstream pressure, and empty to the downstream path. The cycle of each ballast is timed in phased relationship to the other ballasts to keep the flow relatively uninterrupted; as one fills, another equilibrates, and another empties.
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公开(公告)号：US11846614B2
公开(公告)日：2023-12-19
申请号：US17385742
申请日：2021-07-26
申请人： LECO Corporation
CPC分类号： G01N30/30 , G01N30/463 , G01N30/465 , G01N2030/303 , G01N2030/3023 , G01N2030/3053
摘要： A method for modulating analytes in a gaseous stream passing through a capillary, wherein the analytes are retained in a trapping zone of the capillary, or allowed to pass therethrough, based on certain conditions. The method includes, during a first time period, heating the trapping zone of the capillary to a first temperature to desorb analytes therewithin and allow the analytes to pass therethrough, and during a second time period, cooling the capillary to a second temperature that is sufficient to trap and focus the analytes within the trapping zone. During the first time period, the method also includes retaining heat at the capillary during to minimize the load on a cooling device thermally connected thereto, and during the second time period, selectively allowing thermal transfer toward the cooling device.
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公开(公告)号：US20220262616A1
公开(公告)日：2022-08-18
申请号：US17625682
申请日：2020-07-10
申请人： LECO Corporation
摘要： A time-of-flight mass spectrometer (TOF MS) comprises a mass analyzer, an ion pushing device, a filtering device, a multi-pass reflector, a detector, and a decoder. The ion pushing device is arranged to push ions into the mass analyzer. The filtering device is arranged to filter a portion of the ions based on a mass range of the ions. The multi-pass reflector is arranged to selectively reflect the ions for further passes through the mass analyzer. The detector is arranged to receive the ions. The decoder is arranged to reconstruct a mass spectrum for the entire mass range of the ions.
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公开(公告)号：US20220082535A1
公开(公告)日：2022-03-17
申请号：US17423090
申请日：2020-01-17
申请人： LECO Corporation
摘要： A multi-dimensional gas chromatograph for analyzing compounds in a sample during a single run is disclosed. The multi-dimensional gas chromatograph includes a first column, a second column, and a modulator disposed between the first column and the second column. The modulator modulates at (i) a first modulation period over a first time period during the run and (ii) a second modulation period over a second time period during the run later than the first time, the second modulation period being different than the first modulation period.
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公开(公告)号：US20210372888A1
公开(公告)日：2021-12-02
申请号：US17335540
申请日：2021-06-01
申请人： Leco Corporation
发明人： Peter M. Willis , Bradley R. Rush
摘要： A rotary dosing device for use in analytical instrumentation quickly transfers a sequence of precise molar quantities of gas from a primary stream into a secondary stream. The device has a rotating chamber with dosing ports that cycle through three states: fill, equilibrate, and transfer. The device cycles in an overlapping manner such that as one dose volume fills with gas from the primary stream, another equilibrates at a known pressure and temperature, and another transfers its contents to the secondary stream. The device initiates its operation so that the first transfer in a sequence is a properly filled and equilibrated dose from the primary stream. Rather than cycling a single dose volume through the three states multiple times, the overlapping operation of the rotary doser enables multiple precise molar quantities of gas to be transferred in one-third the time.
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公开(公告)号：US10794879B2
公开(公告)日：2020-10-06
申请号：US16534202
申请日：2019-08-07
申请人： LECO Corporation
摘要： For improving sensitivity, dynamic range, and specificity of GC-MS analysis there are disclosed embodiments of novel apparatuses based on improved characteristics of semi-open source with electron impact ionization, providing much higher brightness compared to known open EI sources. In an implementation, the source becomes compatible with multi-reflecting TOF analyzers for higher resolution analysis for improving detection limit. With improved schemes of spatial and temporal refocusing there are proposed various tandem TOF-TOF spectrometers with PSD, CID, and SID fragmentation and using either singly reflecting TOF or MR-TOF analyzers.
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公开(公告)号：US10770280B2
公开(公告)日：2020-09-08
申请号：US15301249
申请日：2015-03-31
申请人： LECO Corporation
摘要： There is proposed a right angle time-of-flight detector comprising a conductive converter for emitting and accelerating secondary electrons, a magnetic field formed by at least one magnet for deflecting the secondary electrons at a right angle and a sealed photo-multiplier. The detector is expected to provide an extended resource and dynamic range and may be fit into tight assemblies, such as MR-TOF MS.
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公开(公告)号：US10741377B2
公开(公告)日：2020-08-11
申请号：US16787268
申请日：2020-02-11
申请人： LECO Corporation
摘要： An ion guide includes electrodes and an RF generator. The electrodes extend in a Z-axis that is straight or curved with a radius that is larger than a distance between the electrodes. The electrodes are made of carbon filled ceramic resistors, silicon carbide, or boron carbide to form bulk resistance with specific resistance between 1 and 1000 Ohm*cm. Conductive Z-edges are disposed on each electrode. An insulating coating is disposed on one side of each electrode and oriented away from an inner region of the ion guide surrounded by said electrodes. At least one conductive track per electrode is attached on a top side of the insulating coating. The conductive track is connected to one conductive electrode edge. The RF generator has at least two sets of secondary coils with DC supplies connected to central taps of the sets of secondary coils to provide at least four distinct signals.
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公开(公告)号：US20200185211A1
公开(公告)日：2020-06-11
申请号：US16787268
申请日：2020-02-11
申请人： LECO Corporation
摘要： An ion guide includes electrodes and an RF generator. The electrodes extend in a Z-axis that is straight or curved with a radius that is larger than a distance between the electrodes. The electrodes are made of carbon filled ceramic resistors, silicon carbide, or boron carbide to form bulk resistance with specific resistance between 1 and 1000 Ohm*cm. Conductive Z-edges are disposed on each electrode. An insulating coating is disposed on one side of each electrode and oriented away from an inner region of the ion guide surrounded by said electrodes. At least one conductive track per electrode is attached on a top side of the insulating coating. The conductive track is connected to one conductive electrode edge. The RF generator has at least two sets of secondary coils with DC supplies connected to central taps of the sets of secondary coils to provide at least four distinct signals.
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