JP2004008721A - Electric kettle - Google Patents

Electric kettle Download PDF

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Publication number
JP2004008721A
JP2004008721A JP2002170879A JP2002170879A JP2004008721A JP 2004008721 A JP2004008721 A JP 2004008721A JP 2002170879 A JP2002170879 A JP 2002170879A JP 2002170879 A JP2002170879 A JP 2002170879A JP 2004008721 A JP2004008721 A JP 2004008721A
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JP
Japan
Prior art keywords
water heater
insulating layer
electric water
container
heating element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002170879A
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Japanese (ja)
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JP3864856B2 (en
Inventor
Yuko Fujii
藤井 優子
Shigetoshi Kanazawa
金澤 成寿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2002170879A priority Critical patent/JP3864856B2/en
Publication of JP2004008721A publication Critical patent/JP2004008721A/en
Application granted granted Critical
Publication of JP3864856B2 publication Critical patent/JP3864856B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in a thermal conduction mechanism of a conventional heating cooker, an air layer, or the like, exists due to a separate structure of a vessel and a heating means, so that thermal efficiency goes down. <P>SOLUTION: An electric kettle is composed of a vessel 11 containing a liquid 10, an insulating layer 12 formed on a bottom surface of the vessel 11, and a heating body 13 formed on the insulating layer 12 to heat the liquid 10. According to this structure, since the heating body 13 and the vessel 11 are structured integrally, a thermal efficiency is increased, energy-savings can be achieved, and the size of the kettle can be reduced. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、電気湯沸かし器に関するものである。
【0002】
【従来の技術】
従来の電気湯沸かし器の構成を図4に基づいて説明する。液体1を収容する容器2の底面に加熱手段3を設け、固定治具4によって容器2と加熱手段3が接し、固定される構造となる。また加熱手段3には電気回路5を通して電力を供給・制御している。また電力制御するためには温度センサ6を容器2に外接させて液体1の温度を検知することで行っている。
【0003】
【発明が解決しようとする課題】
しかしながら、従来の図4に示した電気湯沸かし器の熱伝導機構は、容器2と加熱手段3とが別構造となっているため空気層等が存在してしまい熱効率が低くなってしまう。
【0004】
【課題を解決するための手段】
本発明は、上記課題を解決するために、液体を収容する容器と、前記容器の底面部に形成した絶縁層と、前記絶縁層上に形成した発熱体とを備えた電気湯沸かし器である。
【0005】
この構成によれば、発熱体と容器が一体構成になっているので熱効率が高くなり省エネが実現できるとともに、小型化が可能となる。
【0006】
【発明の実施の形態】
請求項1の発明は、液体を収容する容器と、前記容器の底面部に形成した絶縁層と、前記絶縁層上に形成した発熱体とを備えた電気湯沸かし器である。
【0007】
よって、発熱体と容器が一体構成になっているので熱効率が高くなり省エネが実現できるとともに小型化が可能となる。
【0008】
請求項2記載の発明は、特に請求項1記載の発明において、容器の底面部を金属で構成した電気湯沸かし器である。
【0009】
よって、容器を金属で構成することで、衝撃等の信頼性が増すとともに製造加工も容易である。
【0010】
請求項3記載の発明は、特に請求項1または2記載の発明において、少なくとも絶縁層または発熱体の一方を印刷形成した電気湯沸かし器である。
【0011】
よって、印刷成形によって容易に構成できるとともに、薄型形成が可能となる。
【0012】
請求項4記載の発明は、特に請求項1〜3のいずれか1項に記載の発明において、発熱体上に保護層を形成した電気湯沸かし器である。
【0013】
よって、保護層を設けることによって抵抗体の腐食等の影響を抑制することが可能となり信頼性が向上する。
【0014】
請求項5記載の発明は、特に請求項4記載の保護層が絶縁層と同質材料である電気湯沸かし器である。
【0015】
よって、保護層を絶縁板と同質材料にすることによって、絶縁板との密着性が向上するとともに、熱膨張差による歪み等の影響が無いため信頼性が増す。
【0016】
請求項6記載の発明は、特に請求項1〜5のいずれか1項に記載の発明において、絶縁層あるいは保護層上に温度により抵抗が変化する抵抗体を形成し、前記抵抗体によって液体の温度を検知する電気湯沸かし器である。
【0017】
よって、容器の底面に形成した絶縁層または保護層に抵抗体を形成することで、より精度良く水温を検知できるため、安全性が向上する。
【0018】
請求項7記載の発明は、特に請求項1〜6のいずれか1項に記載の発明において、発熱体はPt、Pd、Rh、Ni、Agの群から選択される少なくとも1種の有機金属化合物または金属粉末を有した電気湯沸かし器である。
【0019】
よって、発熱体はPt、Pd、Rh、Ni、Agの群から選択される少なくとも1種の有機金属化合物または金属粉末を含む材料で構成したことによって発熱体自身の延性が優れるため絶縁板との密着性に優れるとともに、クラック等の発生がないため信頼性が向上する。
【0020】
請求項8記載の発明は、特に請求項1〜7のいずれか1項に記載の発明において、絶縁層は結晶化ガラスで形成した電気湯沸かし器である。
【0021】
よって、結晶化ガラスで形成することで熱衝撃等に対する信頼性が向上する。
【0022】
【実施例】
以下、本説明の実施例について図面を用いて説明する。
【0023】
(実施例1)
図1は、本発明の実施例1における電気湯沸し器の断面図である。構成を説明すると、液体10を収容する容器11と、容器11の底面部に形成した絶縁層12と、絶縁層12上に発熱体13を形成して構成した。容器11は衝撃に優れ、加工も容易である金属材料を使用し、本実施例においてはSUS430系を使用した。この容器1の底面部に絶縁層12を形成した。絶縁層2は絶縁性、耐熱性を有するものであれば特に限定はなく、セラミック等でも良いが、本実施例において絶縁層12は結晶化ガラスを使用することで熱衝撃性が増した。
【0024】
また、この結晶化ガラスはペースト状のものを容器11の底面部に印刷・焼成することで形成した。印刷形成することで容易に絶縁層12を形成できるとともに薄型構造が可能となる。
【0025】
さらに、絶縁層2の上に発熱体13を形成するが、本実施例において発熱体13はAg・Pdによって構成された金属ペーストを印刷によって形成することで構成した。とくに発熱体3はPt、Pd、Rh、Ni、Agの群から選択される少なくとも1種の有機金属化合物あるいは金属粉末を含む材料で構成することによって抵抗体自身の延性が優れるため絶縁板との密着性に優れるとともに、クラック等の発生がないため信頼性が増す。
【0026】
さらに、発熱体13の上に保護層14を形成することによって腐食などの影響を抑制することが可能となり信頼性が向上する。さらに保護層14を絶縁層12と同質材料で構成することによって、熱膨張差によって生じるマイクロクラックなどの発生を抑制できるため、より信頼性が増す。本構成によって小型構成になるとともに容器11と発熱体13の空気層の影響を取り除くことができ、より効率良く液体を加熱することができる。液体10として水2Lを加熱するのに必要な電力を測定し、図3に示した従来の電気湯沸かし器と、本発明の電気湯沸かし器で比較した。
【0027】
この結果、従来の電気湯沸かし器は806Wh必要であるのに対し、本発明の電気湯沸かし器は686Whであり、約120Whの省エネとなった。この結果から本実施例の電気湯沸かし器は、容器11と発熱体13が一体構成になっているので発熱体の熱が効率良く液体10に伝達され、省エネ効果を有することができる。
【0028】
さらに、従来の電気湯沸かし器は熱の伝達が悪いため、容器2の裏面温度が240度まで上昇したが、本発明の電気湯沸し器は熱伝達が良いため、容器11の裏面温度は120度と低くすることが可能である。従来では電気回路5への熱の影響を防ぐために電気回路5と加熱手段3とは近接することができなかったが、本発明では容器11の裏面温度が低いので発熱体13に電力を供給する電気回路15と近接することが可能となり小型化も実現できる。
【0029】
(実施例2)
図2は、本発明の実施例2における電気湯沸し器の断面図である。実施例1と異なる点は絶縁層11あるいは保護層14に温度によって抵抗値が変化する抵抗体16を形成し、液体10の温度を検知し電気回路15によって電力調整している点である。本実施例において抵抗体16として銀ペーストを印刷焼成することで絶縁層上に形成した。図3に液体10の温度と抵抗体16の抵抗値を示した。この結果から抵抗値と液体10の温度とは相関があるため精度良い検知が実現でき安全性を向上することが可能となる。
【0030】
さらに、新たに図4に示した従来の電気湯沸し器のように温度センサ6を容器11に外接する必要がないため小型化が実現できる。また従来の電気湯沸し器は実施例1でも述べたように熱の伝達が悪いため容器2と液体1との温度差が非常に大きく、温度センサ6での温度検知は応答性が低く精度も低かった。しかし本発明の電気湯沸し器では熱の伝達が良いため、容器11の温度と液体10の温度はほぼ同じである。このため抵抗体16の温度検知は応答性が良好でかつ、精度も高い。
【0031】
なお、本実施例において、抵抗体16として銀ペーストを使用したが、温度によって抵抗値が変化するものであればこれに限るものではない。
【0032】
【発明の効果】
以上のように、請求項1から8に記載された発明によれば、加熱手段と容器が一体構成になっているので熱効率が高くなり省エネが実現できるとともに、小型化が可能となる。
【図面の簡単な説明】
【図1】本発明の実施例1における加熱調理器の構成図
【図2】本発明の実施例1における加熱調理器の構成図
【図3】本発明の液体の温度と抵抗体の出力結果を示す特性図
【図4】従来の加熱調理器の断面図
【符号の説明】
11 容器
12 絶縁層
13 発熱体
14 保護層
16 抵抗体
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric water heater.
[0002]
[Prior art]
The configuration of a conventional electric water heater will be described with reference to FIG. The heating means 3 is provided on the bottom surface of the container 2 containing the liquid 1, and the container 2 and the heating means 3 are in contact with and fixed by the fixing jig 4. Electric power is supplied and controlled to the heating means 3 through an electric circuit 5. Power control is performed by externally connecting the temperature sensor 6 to the container 2 and detecting the temperature of the liquid 1.
[0003]
[Problems to be solved by the invention]
However, in the heat conduction mechanism of the conventional electric water heater shown in FIG. 4, since the container 2 and the heating means 3 have different structures, an air layer or the like is present and the thermal efficiency is reduced.
[0004]
[Means for Solving the Problems]
The present invention, in order to solve the above-mentioned problem, is an electric water heater including a container for accommodating a liquid, an insulating layer formed on a bottom portion of the container, and a heating element formed on the insulating layer.
[0005]
According to this configuration, since the heating element and the container are integrally configured, the thermal efficiency is increased, energy can be saved, and the size can be reduced.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 is an electric water heater including a container for accommodating a liquid, an insulating layer formed on a bottom portion of the container, and a heating element formed on the insulating layer.
[0007]
Therefore, since the heating element and the container are integrally formed, the thermal efficiency is increased, energy can be saved, and the size can be reduced.
[0008]
A second aspect of the present invention is an electric water heater in which the bottom surface of the container is made of metal in the first aspect of the invention.
[0009]
Therefore, when the container is made of metal, the reliability of impact and the like is increased and the manufacturing process is easy.
[0010]
The invention according to claim 3 is an electric water heater in which at least one of the insulating layer and the heating element is formed by printing in the invention according to claim 1 or 2.
[0011]
Therefore, it can be easily formed by print molding and can be formed thin.
[0012]
The invention according to a fourth aspect is an electric water heater in which a protective layer is formed on a heating element in the invention according to any one of the first to third aspects.
[0013]
Therefore, by providing the protective layer, it is possible to suppress the influence of corrosion of the resistor and the like, and the reliability is improved.
[0014]
The invention according to claim 5 is an electric water heater in which the protective layer according to claim 4 is made of the same material as the insulating layer.
[0015]
Therefore, by forming the protective layer from the same material as the insulating plate, the adhesion to the insulating plate is improved, and the reliability is increased because there is no influence of distortion due to a difference in thermal expansion.
[0016]
According to a sixth aspect of the present invention, in particular, in the invention of any one of the first to fifth aspects, a resistor whose resistance is changed by temperature is formed on the insulating layer or the protective layer, and the resistance of the liquid is changed by the resistor. It is an electric kettle that detects temperature.
[0017]
Therefore, by forming the resistor on the insulating layer or the protective layer formed on the bottom surface of the container, the water temperature can be detected more accurately, and the safety is improved.
[0018]
The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the heating element is at least one kind of an organometallic compound selected from the group consisting of Pt, Pd, Rh, Ni, and Ag. Or an electric water heater having metal powder.
[0019]
Therefore, since the heating element is made of a material containing at least one kind of organometallic compound or metal powder selected from the group consisting of Pt, Pd, Rh, Ni, and Ag, the ductility of the heating element itself is excellent. The adhesiveness is excellent, and the reliability is improved because cracks and the like do not occur.
[0020]
According to an eighth aspect of the present invention, in particular, in the first aspect of the present invention, the insulating layer is an electric water heater formed of crystallized glass.
[0021]
Therefore, the reliability with respect to thermal shock and the like is improved by forming with crystallized glass.
[0022]
【Example】
Hereinafter, embodiments of the present description will be described with reference to the drawings.
[0023]
(Example 1)
FIG. 1 is a cross-sectional view of an electric water heater according to Embodiment 1 of the present invention. Explaining the configuration, a container 11 containing the liquid 10, an insulating layer 12 formed on the bottom of the container 11, and a heating element 13 formed on the insulating layer 12 were formed. The container 11 is made of a metal material which is excellent in impact and is easy to process. In this embodiment, SUS430 is used. An insulating layer 12 was formed on the bottom of the container 1. The insulating layer 2 is not particularly limited as long as it has insulation and heat resistance, and may be ceramic or the like. In this embodiment, the use of crystallized glass for the insulating layer 12 increases the thermal shock resistance.
[0024]
The crystallized glass was formed by printing and baking a paste-like glass on the bottom of the container 11. By printing, the insulating layer 12 can be easily formed and a thin structure can be realized.
[0025]
Further, the heating element 13 is formed on the insulating layer 2. In this embodiment, the heating element 13 is formed by forming a metal paste made of Ag / Pd by printing. In particular, the heating element 3 is made of a material containing at least one kind of organometallic compound or metal powder selected from the group consisting of Pt, Pd, Rh, Ni, and Ag. As well as excellent adhesion, there is no occurrence of cracks and the like, so reliability increases.
[0026]
Further, by forming the protective layer 14 on the heating element 13, the influence of corrosion or the like can be suppressed, and the reliability is improved. Further, by forming the protective layer 14 from the same material as the insulating layer 12, it is possible to suppress the occurrence of microcracks and the like caused by the difference in thermal expansion, thereby further increasing reliability. With this configuration, a compact configuration can be achieved, and the influence of the air layer of the container 11 and the heating element 13 can be removed, so that the liquid can be heated more efficiently. The electric power required to heat 2 L of water as the liquid 10 was measured, and compared with the conventional electric water heater shown in FIG. 3 and the electric water heater of the present invention.
[0027]
As a result, while the conventional electric water heater requires 806 Wh, the electric water heater of the present invention requires 686 Wh, which saves about 120 Wh. From this result, in the electric water heater of the present embodiment, since the container 11 and the heating element 13 are integrally formed, the heat of the heating element is efficiently transmitted to the liquid 10 and an energy saving effect can be obtained.
[0028]
Furthermore, the back surface temperature of the container 2 has risen to 240 degrees due to poor heat transfer in the conventional electric water heater, but the back surface temperature of the container 11 is as low as 120 degrees due to the good heat transfer of the electric water heater of the present invention. It is possible to Conventionally, the electric circuit 5 and the heating means 3 could not be close to each other in order to prevent the influence of heat on the electric circuit 5, but in the present invention, power is supplied to the heating element 13 because the back surface temperature of the container 11 is low. It can be close to the electric circuit 15 and can be downsized.
[0029]
(Example 2)
FIG. 2 is a cross-sectional view of an electric water heater according to Embodiment 2 of the present invention. The difference from the first embodiment is that a resistor 16 whose resistance value changes according to the temperature is formed on the insulating layer 11 or the protective layer 14, the temperature of the liquid 10 is detected, and the power is adjusted by the electric circuit 15. In this embodiment, the resistor 16 was formed on the insulating layer by printing and baking a silver paste. FIG. 3 shows the temperature of the liquid 10 and the resistance value of the resistor 16. From this result, since there is a correlation between the resistance value and the temperature of the liquid 10, accurate detection can be realized and safety can be improved.
[0030]
Further, unlike the conventional electric water heater shown in FIG. 4, it is not necessary to externally connect the temperature sensor 6 to the container 11, so that the size can be reduced. In addition, the conventional electric water heater has a very large temperature difference between the container 2 and the liquid 1 due to poor heat transfer as described in the first embodiment, and the temperature detection by the temperature sensor 6 has low response and low accuracy. Was. However, in the electric kettle of the present invention, since the heat transfer is good, the temperature of the container 11 and the temperature of the liquid 10 are almost the same. Therefore, the temperature detection of the resistor 16 has good responsiveness and high accuracy.
[0031]
In this embodiment, the silver paste is used as the resistor 16. However, the present invention is not limited to this, as long as the resistance changes depending on the temperature.
[0032]
【The invention's effect】
As described above, according to the first to eighth aspects of the present invention, since the heating means and the container are integrally configured, the thermal efficiency is increased, energy can be saved, and the size can be reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a heating cooker according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of a heating cooker according to a first embodiment of the present invention. FIG. 3 is an output result of a liquid temperature and a resistor according to the present invention. FIG. 4 is a cross-sectional view of a conventional cooking device.
11 Container 12 Insulating Layer 13 Heating Element 14 Protective Layer 16 Resistor

Claims (8)

液体を収容する容器と、前記容器の底面部に形成した絶縁層と、前記絶縁層上に形成した発熱体とを備えた電気湯沸かし器。An electric water heater comprising: a container for accommodating a liquid; an insulating layer formed on a bottom portion of the container; and a heating element formed on the insulating layer. 容器の底面部を金属で構成した請求項1記載の電気湯沸かし器。2. The electric water heater according to claim 1, wherein the bottom of the container is made of metal. 少なくとも絶縁層または発熱体の一方を印刷形成した請求項1または2記載の電気湯沸かし器。3. The electric water heater according to claim 1, wherein at least one of the insulating layer and the heating element is formed by printing. 発熱体上に保護層を形成した請求項1〜3のいずれか1項に記載の電気湯沸かし器。The electric water heater according to any one of claims 1 to 3, wherein a protective layer is formed on the heating element. 保護層が絶縁層と同質材料である請求項4記載の電気湯沸かし器。The electric water heater according to claim 4, wherein the protective layer is made of the same material as the insulating layer. 絶縁層または保護層上に温度によって抵抗が変化する抵抗体を形成し、前記抵抗体によって液体の温度を検知する請求項1〜5のいずれか1項に記載の電気湯沸かし器。The electric water heater according to any one of claims 1 to 5, wherein a resistor whose resistance changes with temperature is formed on the insulating layer or the protective layer, and the temperature of the liquid is detected by the resistor. 発熱体はPt、Pd、Rh、Ni、Agの群から選択される少なくとも1種の有機金属化合物または金属粉末を有した請求項1〜6のいずれか1項に記載の電気湯沸かし器。The electric water heater according to any one of claims 1 to 6, wherein the heating element has at least one kind of organometallic compound or metal powder selected from the group consisting of Pt, Pd, Rh, Ni, and Ag. 絶縁層が結晶化ガラスで形成した請求項1〜7のいずれか1項に記載の電気湯沸かし器。The electric water heater according to any one of claims 1 to 7, wherein the insulating layer is formed of crystallized glass.
JP2002170879A 2002-06-12 2002-06-12 Electric water heater Expired - Fee Related JP3864856B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002170879A JP3864856B2 (en) 2002-06-12 2002-06-12 Electric water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002170879A JP3864856B2 (en) 2002-06-12 2002-06-12 Electric water heater

Publications (2)

Publication Number Publication Date
JP2004008721A true JP2004008721A (en) 2004-01-15
JP3864856B2 JP3864856B2 (en) 2007-01-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109744866A (en) * 2017-11-08 2019-05-14 广东美的生活电器制造有限公司 Liquid heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109744866A (en) * 2017-11-08 2019-05-14 广东美的生活电器制造有限公司 Liquid heater
CN109744866B (en) * 2017-11-08 2024-03-26 广东美的生活电器制造有限公司 Liquid heater

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