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公开(公告)号：US11940432B2
公开(公告)日：2024-03-26
申请号：US17267059
申请日：2019-07-25
Applicant: Figaro Engineering Inc. , New Cosmos Electric Co., Ltd. , University Public Corporation Osaka
Inventor： Masato Takeuchi , Junpei Furuno , Kenta Fukui , Kuniyuki Izawa , Masakazu Sai , Hirokazu Mitsuhashi , Takafumi Taniguchi
CPC classification number: G01N33/0014 , B01D71/08 , B01D71/22
Abstract: A gas detector comprises a gas detection unit and a filter introducing surrounding atmosphere to the gas detection unit. The filter comprises a gas-permeable organic polymer membrane having an acidic group or a basic group.
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公开(公告)号：US11567021B2
公开(公告)日：2023-01-31
申请号：US16973063
申请日：2019-04-24
Applicant: Figaro Engineering Inc.
Inventor： Masakazu Sai , Kuniyuki Izawa , Tomohiro Kawaguchi
IPC: G01N27/12
Abstract: A gas detector uses a MEMS gas sensor having: a substrate provided with a cavity and an insulating film over the cavity; a metal oxide semiconductor and a heater both provided on the insulating film. A drive circuit operates the heater with a predetermined period for a predetermined pulse duration in order to heat the metal oxide semiconductor. The drive circuit halts operation of the heater or elongates the period when a humidity sensor detects that the atmosphere is humid.
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公开(公告)号：US20220163474A1
公开(公告)日：2022-05-26
申请号：US17432973
申请日：2020-03-17
Applicant: Figaro Engineering Inc. , University of Fukui
Inventor： Masakazu SAI , Kenichi YOSHIOKA , Kuniyuki IZAWA , Toshikazu SAKAGUCHI
Abstract: A gas sensor comprises a gas separation membrane comprising substituted polyacetylene where a substituent group is combined to a double-bonded carbon atom in the backbone chain of the substituted polyacetylene and a sensing element configured to detect gas permeated through the gas separation membrane.
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14.发明申请公开(公告)号：US20210247341A1
公开(公告)日：2021-08-12
申请号：US17054893
申请日：2019-03-01
Applicant: Figaro Engineering Inc.
Inventor： Kuniyuki IZAWA
Abstract: A gas detector comprises a metal oxide semiconductor gas sensor whose resistance decreases in reducing gases and a digital information processing device that treats the output of the gas sensor and compares the output with a comparison value for gas detection. The digital information processing device extracts data representing the resistance of the gas sensor in air from the output of the gas sensor and generates the comparison value such that the larger the resistance of the gas sensor in air is, the larger the ratio between the resistance of the gas sensor in air and a resistance value corresponding to the comparison value is.
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15.发明申请公开(公告)号：US20190265188A1
公开(公告)日：2019-08-29
申请号：US16005042
申请日：2018-06-11
Applicant: Figaro Engineering Inc.
Inventor： Yoshihiro Yamamoto
IPC: G01N27/404 , G01N27/407 , G01N27/416 , G01N27/12 , G01N27/30
Abstract: The output of the electrochemical gas sensor is amplified, and the ambient temperature is measured by means of a temperature sensor. When the ambient temperature is above or equal to a predetermined temperature, a standard value is generated and stored and is increased when the output of the amplification circuit is larger than the standard value, and a gas is detected according to the difference between the output of said amplification circuit and the standard value.
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Patent Agency Ranking
公开(公告)号：US20170227489A1
公开(公告)日：2017-08-10
申请号：US15016487
申请日：2016-02-05
Applicant: Nagasaki University , Figaro Engineering Inc.
Inventor： Yasuhiro Shimizu , Takeo Hyodo , Taro Ueda , Hirotaka Takeda , Kai Kamada
IPC: G01N27/407
CPC classification number: G01N27/4071 , G01N27/4075 , G01N27/4076 , G01N33/004
Abstract: A CO sensor includes a solid electrolyte substrate, a sensing electrode, and a reference electrode, and outputs electromotive forces in accordance with CO concentrations. The sensing electrode and the reference electrode are provided on the same surface of the solid electrolyte substrate. The sensing electrode contains a metal oxide such as Bi2O3 that generates a positive electromotive force response when coming into contact with CO. The reference electrode contains a metal oxide such as CeO2 that generates a negative electromotive force response when coming into contact with CO.
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公开(公告)号：US20010003916A1
公开(公告)日：2001-06-21
申请号：US09734546
申请日：2000-12-13
Applicant: Figaro Engineering, Inc.
Inventor： Tohru Nomura , Hideki Okoshi , Tomoko Yoshimura
IPC: G01N007/00 , G01N019/10
CPC classification number: G01N33/004 , G01N27/12 , G01N33/0047
Abstract: A central electrode 12 is arranged in a coiled heater electrode 10. They are buried in a SnO2-based inner area 6, and the entirety is covered by a filter 8. The volume of the inner area 6 is set at from 1null10null3 mm3 to 16null10null3 mm3, the total volume of the bead 4 is set at from 15null10null3 mm3 to 70null10null3 mm3, and the ratio of the total volume of the bead 4 to the volume of the inner area 6 is set at from 4 to 20 to bring the sensor resistance in CO and that in methane closer to each other and increase the selectivity from hydrogen.
Abstract translation: 中心电极12布置在线圈加热器电极10中。它们被埋在基于SnO 2的内部区域6中，并且整个被过滤器8覆盖。内部区域6的体积设定为1×10 -3 mm 3 到16×10 -3 mm 3，珠4的总体积设定为15×10 -3 mm 3〜70×10 -3 mm 3，珠4的总体积与内区6的体积的比率设定为 4至20以使传感器电阻在CO和甲烷中的电阻更接近并增加氢的选择性。
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公开(公告)号：US11977007B2
公开(公告)日：2024-05-07
申请号：US17264868
申请日：2020-05-01
Applicant: Figaro Engineering Inc. , New Cosmos Electric Co., Ltd. , University Public Corporation Osaka
Inventor： Masato Takeuchi , Junpei Furuno , Kenta Fukui , Kenichi Yoshioka , Tatsuya Tanihira , Masakazu Sai , Takafumi Taniguchi , Hirokazu Mitsuhashi
CPC classification number: G01N1/2205 , B01D53/0407 , B01J20/22 , B01J20/28064 , B01J20/28073 , B01J20/28076 , G01N27/16
Abstract: Siloxane compounds are removed from the atmospheres by silica supporting an organic sulfonic acid compound. The silica with the organic sulfonic acid compound has a specific surface area down to 500 m2/g and up to 750 m2/g and a pore volume down to 0.8 m3/g and up to 1.2 m3/g, both measured by nitrogen gas adsorption method and has a pore diameter down to 4 nm and up to 8 nm, at the peak of differential pore volume measured by nitrogen gas adsorption method. The durability of gas sensing element against siloxanes is improved.
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公开(公告)号：US20210164951A1
公开(公告)日：2021-06-03
申请号：US17267059
申请日：2019-07-25
Applicant: Figaro Engineering Inc. , New Cosmos Electric Co., Ltd. , University Public Corporation Osaka
Inventor： Masato TAKEUCHI , Junpei FURUNO , Kenta FUKUI , Kuniyuki IZAWA , Masakazu SAI , Hirokazu MITSUHASHI , Takafumi TANIGUCHI
Abstract: A gas detector comprises a gas detection unit and a filter introducing surrounding atmosphere to the gas detection unit. The filter comprises a gas-permeable organic polymer membrane having an acidic group or a basic group.
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公开(公告)号：US20210164929A1
公开(公告)日：2021-06-03
申请号：US17267060
申请日：2019-07-25
Applicant: Figaro Engineering Inc. , New Cosmos Electric Co., Ltd. , University Public Corporation Osaka
Inventor： Masato TAKEUCHI , Junpei FURUNO , Kenta FUKUI , Kuniyuki IZAWA , Masakazu SAI , Hirokazu MITSUHASHI , Takafumi TANIGUCHI
Abstract: A gas detection unit is accommodated within a housing of a gas sensor and the outside atmosphere of the housing is introduced through the filter to the gas detection unit. The filter comprises an organic polymer gas-permeable filter removing siloxanes and an inorganic filter removing alcohols and passing gases to be detected.
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