baber/WOPTO huggingface dataset:
Patent JP-2012512266-A (JP)
Title: ポリマー性毛髪染料
IPC: C09B69/10
Filed: 2009-12-04
Abstract: 少なくとも１個の共有結合したカチオン性染料を有する天然もしくは合成のアミノ酸から選択されるオリゴおよびポリペプチドを含有するポリマー性染料。これらの染料を使用して、ヒトの毛髪に対して非常に良好な染色結果が得られる。
Patent JP-2012513126-A (JP)
Title: 機械的信頼性のある太陽電池モジュール
IPC: H01L31/04
Filed: 2009-12-17
Abstract: 第１のフロートガラスシート上に堆積された薄膜型太陽電池と、アイオノマー封止材シートと、フロートガラス保護シートと、を含む薄膜型太陽電池モジュール。
Patent JP-2012516300-A (JP)
Title: ドデカトリエナールの単離法、及びその香料としての使用
IPC: C07C47/21
Filed: 2010-01-27
Abstract: 本発明は、Ｚ−１個の環と７〜１６個のＣ原子とを有し、アルデヒド基を少なくとも１つ有する、少なくとも１つの化合物の製造方法に関し、本方法は少なくとも以下の工程：（ａ１）Ｚ個の環と７〜１６個のＣ原子とを有し、Ｃ−Ｃ二重結合を少なくとも２つ有する環状オレフィンを少なくとも含む組成物（Ａ）を、一酸化二窒素により酸化して、組成物Ａ１を得る工程、（ａ２）Ｚ個の環と７〜１６個のＣ原子とを有し、Ｃ−Ｃ二重結合を少なくとも２つ有する、少なくとも１つの環状オレフィンを、工程（ａ１）から得られる組成物（Ａ１）から分離して、組成物（Ａ２）を得る工程、（ｂ１）Ｚ個の環と７〜１６個のＣ原子とを有し、ケト基を有する少なくとも１つの環状化合物を、工程（ａ２）から得られる組成物（Ａ２）から分離して、Ｚ−１個の環と７〜１６個のＣ原子とを有し、アルデヒド基を少なくとも１つ、Ｃ−Ｃ二重結合を少なくとも２つ有する、少なくとも１つの化合物を含有する組成物（Ｂ１）を得る工程、を含み、ここでＺは１、２、３、又は４である。
Patent JP-2012516485-A (JP)
Title: 画像における変化した可能性のあるオブジェクトの検出
IPC: G06T7/20
Filed: 2010-01-28
Abstract: 第１の画像と第２の画像とが、少なくとも部分的に重なり合っている場合に、第１の画像と第２の画像とにおいて、変化した可能性のあるオブジェクトを検出する方法である。当該方法は、第１の画像（２０３Ａ）を記述しているデータと第２の画像（２０３Ｂ）を記述しているデータとを得て、画像の中のオブジェクトの組を検出することを含む。オブジェクトの組に対する共通座標系を計算する。オブジェクトの場所に基づいて、組の中のオブジェクトを削除して、更に、画像の重なり合うエリアの外部のオブジェクトを削除する。組の中のゼロ以上の残りのオブジェクトを示すデータ（２１７）を出力して、変化した可能性のあるオブジェクトを示す。 【選択図】    図２
Patent JP-2012518923-A (JP)
Title: 無線ネットワーク問題を突き止める方法、装置、およびシステム
IPC: H04W36/30
Filed: 2010-02-11
Abstract: 本発明の各実施形態は、無線ネットワーク問題を突き止めるための方法、装置、およびシステムを開示する。具体的には、ユーザ機器(UE)に無線ネットワーク問題が生じた場合、無線リソース制御(RRC)接続を再確立もしくは確立するときに、または前記RRC接続が確立された後に、前記UEとの間で前記RRC接続を確立したセルは、前記UEによって送信された無線ネットワーク問題情報を受信し、無線ネットワーク問題が生じているサーバ側またはセルに、前記問題情報を転送する。これにより、ネットワーク側は、UEに生じている無線ネットワーク問題を自動的に特定し突き止めることができ、ネットワークは自らを調整し最適化することができ、結果的にネットワークパフォーマンスを改善し、ユーザの要求を満たすことができる。
Patent JP-2012518564-A (JP)
Title: 車両の衝突を分類する方法及び装置
IPC: B60R21/0134
Filed: 2009-12-21
Abstract: 本発明は、車両の直線運動に関する情報を含んだ直線信号（１）をインタフェースを介して受信するステップと、前記車両の回転運動に関する情報を含んだ回転信号（２）をインタフェースを介して受信するステップと、前記直線信号と前記回転信号とに基づいて、衝突に関する情報を含んだ評価信号（７１）を生成するすステップとを有する、車両の衝突を分類する方法に関する。
Patent JP-2012518232-A (JP)
Title: コンダクトルーチンの管理および制御のための装置
IPC: G06T7/20
Filed: 2010-02-18
Abstract: 所定時間内に繰り返される行動および／または活動を捉えるために構成された特定の行動または活動を取得するための第１手段（１１，２１）と、新しいと解釈される行動パターンを記憶するよう構成された、行動パターンおよび活動パターンを記憶するための第２手段（１２，２２）とを少なくとも備えるコンダクトルーチンの管理および制御のための装置であって、処理および制御のための第３論理手段（１３，２３）において、上記第１手段および上記第２手段の結果が比較されて、（ｉ）現在のパターンの比較が過去のパターンと一致する場合、第１アラート出力がユーザに対し確定して出力され、その第１アラート出力は、現在のパターンが認識されたことを知らせるよう設定される、および、（ｉｉ）作動させるための第４手段（１４，２４）に向けての第２出力が生成され、認識された行動または活動が自律モードで再生される、ことに応じて構成された出力を確定して出力することを特徴とする。
Patent JP-2012518491-A (JP)
Title: 臭気抑制体排出液吸収体
IPC: A61F13/472
Filed: 2010-02-23
Abstract: 臭気抑制体排出液吸収部材が、（ａ）吸収材料または基材と、（ｂ）以下の式（Ｉ）のハロ活性芳香族スルホンアミド化合物とを含む： 【化１】     ［式中、Ｒ １ 、Ｒ ２ 、Ｒ ３ 、Ｒ ４ 、Ｒ ５ 、Ｘ、Ｍ、およびｎは、本明細書に記載するとおりであり、Ｒ １ 、Ｒ ２ 、Ｒ ３ 、Ｒ ４ 、およびＲ ５ の少なくとも１つは水素ではない］。本吸収部材はさまざまな体液から生じる臭気を効果的に抑制する。
Patent JP-2012519433-A (JP)
Title: プロキシ移動体インターネットプロトコルバージョン６ローカルルーティングに関する経路最適化のための方法および装置
IPC: H04L45/122
Filed: 2010-02-27
Abstract: MN(移動ノード)に関連し、さらにPBU(プロキシ結合更新)を、CN(コレスポンデントノード)に関連する第2MAG(移動体アクセスゲートウェイ)に送信する第1MAGを備える装置。MAGへのROStartReq(経路最適化開始要求)メッセージの送信を促進するように構成されたプロセッサを備える装置であって、ROStartReqメッセージは、MNとCNの間の経路最適化を要求し、さらにROStartReqメッセージは、MN-CN RO(経路最適化)オプションを備える装置。LMA(ローカル移動性アンカ)と、LMAに結合され、MNと通信状態にある第1のMAGと、LMAに結合され、CNと通信状態にある第2のMAGとを備えるシステムであって、MNとCNの間の通信は、LMAを経由してルーティングされることなしに第1のMAGおよび第2のMAGを経由してルーティングされるシステム。
Patent JP-2012145108-A (JP)
Title: Apparatus and method for controlling oxygen emission from gas turbine
Inventor: SNOOK DANIEL DAVID
IPC: F02C7/18
Filed: 2012-01-10
Abstract: PROBLEM TO BE SOLVED: To provide an apparatus and method for controlling oxygen emissions from a gas turbine.SOLUTION: A combined cycle power plant 10 includes a first compressor 16 for producing a compressed working fluid 22, and a turbine 20 downstream of the first compressor 16. The turbine 20 includes stationary components and rotating components and produces exhaust gases 38. A heat exchanger 32 downstream of the turbine 20 receives the exhaust gases 38 from the turbine 20, and a second compressor 48 downstream of the heat exchanger 32 receives the exhaust gases 38 from the heat exchanger 32 and provides a flow of the exhaust gases 38 to the turbine 20. A method for reducing oxygen emissions from a gas turbine 12 includes a step of flowing the exhaust gases 38 from the turbine 20 to the heat exchanger 32 and removing heat from the exhaust gases 38, and a step of increasing the pressure of the exhaust gases 38 to produce a pressurized exhaust gas and flowing the pressurized exhaust gas back to the turbine 20 to remove heat from the turbine 20.
Patent JP-2013147361-A (JP)
Title: Sapphire single crystal and method for producing sapphire single crystal
Inventor: SHONAI TOMOHIRO
IPC: C30B29/20
Filed: 2012-01-17
Abstract: PROBLEM TO BE SOLVED: To more precisely suppress the deterioration in the crystallinity of a body part of a sapphire ingot and entrainment of bubbles in the body part when a sapphire single crystal is crystal-grown from a melt of aluminum oxide.SOLUTION: A method for producing a sapphire single crystal includes: a melting process for melting, by heating, an aluminum oxide of a solid filled in a crucible in a heating furnace; a seeding process for bringing the lower end of a seed crystal into contact with the melt of aluminum oxide, that is, an alumina melt; a shoulder formation process including a bubble taking process for forming a shoulder part under the seed crystal and taking bubbles that float on the alumina melt in the shoulder part by pulling upward the seed crystal while stopping or rotating in a state that the lower end of the seed crystal is in contact with the alumina melt; and a body part formation process for forming the body part under the shoulder part by pulling upward the seed crystal while rotating the shoulder part through the seed crystal in a state that the lower end of the shoulder part is in contact with the alumina melt.
Patent JP-2013148620-A (JP)
Title: Display device
Inventor: KURIBAYASHI HIDENORI
IPC: G03B21/00
Filed: 2012-01-17
Abstract: PROBLEM TO BE SOLVED: To project a first image and a second image from a single projection unit.SOLUTION: A display device 1 includes: projection units 12 and 13; a member of projection 14 that is projected from a back face by the projection units 12 and 13; and an optical member 15 that is formed along the member of projection 14, and has a first area that diffuses projection light from the projection units 12 and 13 and a second area that transmits the projection light.
Patent JP-2013147094-A (JP)
Title: Pneumatic tire
Inventor: NISHIDE SHIORI
IPC: B60C9/20
Filed: 2012-01-18
Abstract: PROBLEM TO BE SOLVED: To provide a pneumatic tire excellent in both fracture resistance and high speed durability.SOLUTION: A pneumatic tire includes a belt comprised of belt layers of at least two layers, and a code of at least an innermost belt layer positioned at an innermost side in a tire radial direction is bent so that angles to a tire circumferential direction are different at a center part in a tire width direction and an outer part in the tire width direction among the belt layers constituting the belt. An angle between the code of the innermost belt layer and the tire circumferential direction in the center part in the tire width direction is larger than that in the outer part in the tire width direction. In the code of the innermost belt layer, a twisting pitch of a part positioned at the center part in the tire width direction is smaller than that positioned at the outer part in the tire width direction and the twisting pitch of the part positioned at the center part in the tire width direction of the code of the innermost belt layer is smaller than those of the other belt layers.
Patent JP-2013148256-A (JP)
Title: Panel-type heat exchanger for underground thermal source heat pump
Inventor: ECHIGO SHIGERU
IPC: F28F3/12
Filed: 2012-01-18
Abstract: PROBLEM TO BE SOLVED: To provide a ground burial heat exchanger which is used for an underground thermal source heat pump system and can provide immense advantages in terms of cost containment, shortening in work periods and the like compared with existing ones.SOLUTION: A panel-type heat exchanger 1 for an underground thermal source heat pump includes: a steel plate 2; a concrete layer 3 attached to a surface on one side of the steel plate 2; and a pipe 4 embedded in the concrete layer 3. The steel plate 2 has a plurality of plate-like ribs 5 on a surface on a side opposite to the surface attached with the concrete layer 3. The pipe 4 has: an inlet 6 through which a liquid medium passing through the pipe is taken from an outside of the panel-type heat exchanger 1; and an outlet 7 for discharging the liquid medium taken from the inlet 6 to the outside of the panel-type heat exchanger 1.
Patent JP-2013147338-A (JP)
Title: Carrying device of railroad wheel set
Inventor: MIYAUCHI YOSHINORI
IPC: B61F5/00
Filed: 2012-01-20
Abstract: PROBLEM TO BE SOLVED: To eliminate the need for a counterweight and reduce a dimension in an axial direction of a wheel set, in a carrying device of a railroad wheel set.SOLUTION: A carrying device 1 is a device for lifting and carrying a railroad wheel set 50 with a reducer 51 by holding a tread along a circumference of a wheel from above, and includes: two pairs of holding arms 2a, 2b and 3a, 3b which hold the tread at the lower portion; a lifting frame 4 which holds upper parts of the holding arms 2a, 2b, 3a and 3b in an openable/closable manner; an arm opening/closing mechanism which locks lower end parts of the holding arms 2a, 2b, 3a and 3b by holding the tread of the wheel; and reducer supporting pieces 7 and 8 which are provided at intermediate portions of the holding arms 2a, 2b, 3a and 3b and which support the reducer 51 by wrapping around a lower side of the reducer 51 during operation of the holding arms 2a, 2b, 3a and 3b to hold the tread of the wheel. Accordingly, a counterweight is not required and the dimension in the axle direction can be reduced, and at the same time the wheel set 50 can be safely lifted without damaging an axle 54.
Patent JP-2013153911-A (JP)
Title: Game machine
Inventor: ARAKAWA TAKESHI
IPC: A63F7/02
Filed: 2012-01-30
Abstract: PROBLEM TO BE SOLVED: To provide a game machine capable of eliminating the need of a loop processing till completion of an initial processing executed in a subordinate control part, and capable of reducing the program capacity.SOLUTION: A game machine includes: a CPU (a main control CPU 500) for integrally controlling game motions based on a prescribed game program; a resetting circuit (a system reset generating part 113) for generating a resetting signal to reset the CPU (the main control CPU 500); and a reset extension means (a reset extension counter 500a) for extending a resetting period when the CPU (the main control CPU 500) is reset based on the generated resetting signal. The CPU (the main control CPU 500) executes the prescribed game program after the resetting period extended by the reset extension means elapses.
Patent JP-2013156170-A (JP)
Title: Detection method of moisture content in oil and detection device thereof
Inventor: SHIRATA TAKUYA
IPC: G01N21/27
Filed: 2012-01-30
Abstract: PROBLEM TO BE SOLVED: To provide a detection method of a moisture content in oil, which can detect the moisture content in a lubricating oil more easily than ever before.SOLUTION: A detection method of a moisture content in oil, which detects the moisture content in a lubricating oil 109 of a machine, comprises the following processes: white light emitted by a white light emitting element 101 is made penetrate through the lubricating oil 109; the light penetrating through the lubricating oil 109 is made received by a color photodetector 102; a color of the light received by the color photodetector 102 is made detected by the color photodetector 102; and the moisture content is determined on the basis of the brightness of the color detected by the color photodetector 102.
Patent JP-2012124934-A (JP)
Title: Optical transmission system and optical transmission method
Inventor: NAKAJIMA HISAO
IPC: H04B10/556
Filed: 2012-02-02
Abstract: PROBLEM TO BE SOLVED: To provide an optical transmission system that attains good transmission characteristics by surely compensating or correcting a receiving data error caused by a modulation method or a multiplexing method for an optical signal, when receiving and transmitting the optical signal that can transmits multi-bit information for one symbol time.SOLUTION: An optical transmission system includes: an optical transmitter 10; a transmission path 20; and an optical receiver 30. The optical transmitter 10 encodes transmission information according to a predetermined format and produces a plurality of transmission signals corresponding to each of a plurality of transmission channels. When an optical signal, in which light is modulated and produced according to the each transmission signal, is transmitted to the transmission path 20, variation in characteristics among the respective transmission channels occurring at propagation in the transmission path is averaged over the all transmission channels by giving a change to the state of the transmission light. The optical receiver 30 receives the optical signal in response to the change in the state given at the transmission and performs a decoding process including an error correction for the received signal.
Patent JP-2013158709-A (JP)
Title: Anion exchange resin and method for treating the anion exchange resin
Inventor: SATO TOMONORI
IPC: C08L25/06
Filed: 2012-02-06
Abstract: PROBLEM TO BE SOLVED: To provide an anion exchange resin or the like having properties hard to be changed even when an oxidizer is present in water for treatment.SOLUTION: An anion exchange resin is used for an ion exchange means 33 or the like treating water for treatment by passing therethrough the water for treatment containing an oxidizer. In the anion exchange resin, a polyelectrolyte having an acid charge group is added to the anion exchange resin so as to suppress oxidation by the oxidizer contained in the water for treatment.
Patent JP-2013159053-A (JP)
Title: Image forming apparatus and image forming system
Inventor: TSUKAMOTO YASUSHI
IPC: G03G21/00
Filed: 2012-02-06
Abstract: PROBLEM TO BE SOLVED: To provide an image forming apparatus that can execute printing which is based on print data on a storage unit earlier than in the conventional manner, in accordance with an operation input to an input device.SOLUTION: When an MFP (Multifunctional Peripheral) causes a printer to execute printing which is based on image data for printing, the MFP causes, when standby printing as another printing waiting execution by use of the printer is present (YES at S325), the printer to execute the printing which is based on the print image data earlier than the execution waiting printing (S331), and when printing in process as another printing executed by the printer is present (YES at S321), causes the printer to suspend the printing operation in process (S323), then, causes the printer to execute the printing which is based on the print image data (S324), and then, causes the printer to restart the printing operation in process after ending the execution of the printing which is based on the print image data.
Patent JP-2012180591-A (JP)
Title: Substrate treating agent for precoated metal sheet, coated substrate-treated metal sheet coated with the same, and precoated metal sheet produced by using the coated substrate-treated metal sheet
Inventor: MORISHITA ATSUSHI
IPC: C23C22/48
Filed: 2012-02-08
Abstract: PROBLEM TO BE SOLVED: To provide: a new substrate treating agent suitably used for various types of precoated metal sheets; a coated substrate-treated metal sheet processed by coating the substrate treating agent ; and a precoated metal sheet produced using the coated substrate-treated metal sheet.SOLUTION: The substrate treating agent for a precoated metal sheet includes, in water as solid contents, tannin or tannic acid, a silane coupling agent, and fine silica as well as a polyester resin including a sulfonic acid group or a sulfonate group as a substituent, and has a pH as a treating agent of 2.0-6.5. The substrate treating agent for a precoated metal sheet may include a phosphate compound in order to further improve the corrosion resistance of the precoated metal sheet.
Patent JP-2013164231-A (JP)
Title: Vacuum drying apparatus and vacuum drying method
Inventor: OKAMOTO SHUNICHI
IPC: F26B9/06
Filed: 2012-02-13
Abstract: PROBLEM TO BE SOLVED: To provide a vacuum drying apparatus that can reduce mixing of moisture to recover a solvent while decompression-drying a coating liquid on a substrate, and a vacuum drying method.SOLUTION: A vacuum drying apparatus 1 includes: a chamber 2 for accommodating a substrate W; an exhaust device 3 for exhausting a gas in the chamber 2; a recovery device 4 for cooling a gas to recover a liquid generated by cooling; and first piping 5 that connects the chamber 2 to the exhaust device 3 via the recovery device 4 on the way. The vacuum drying apparatus decompression-dries a coating liquid R applied on the substrate W by making the exhaust device 3 exhaust the gas in the chamber 2 through the first piping 5 to perform decompression. The solvent is recovered by liquefying the solvent evaporated from the coating liquid R through decompression drying to be cooled by the recovery device 4. Second piping 6 is further provided that connects the chamber 2 with the exhaust device 3 not by way of the recovery device 4 on the way.
Patent JP-2012095362-A (JP)
Title: Method and device for three-dimensional standstill image service in digital broadcasting ground
Inventor: YUN KUG-JIN
IPC: H04N7/173
Filed: 2012-02-14
Abstract: PROBLEM TO BE SOLVED: To provide a method and device for providing a three-dimensional standstill image in a digital broadcasting ground.SOLUTION: This invention relates to a method and device for providing a three-dimensional standstill image service in a specific interval, during an AV service of digital broadcasting. The method comprises: a step of receiving a reference image and a three-dimensional additive image constituting the three-dimensional standstill image via a data channel or a video channel, with a two-dimensional image; a step of restoring the received reference image and the three-dimensional additive image to the three-dimensional standstill image; and a step of displaying, during digital AV broadcasting using a two-dimensional image, the three-dimensional standstill image in the specific interval, with display information including a reproduction time point and a reproduction mode.
Patent JP-2013166298-A (JP)
Title: Functional film production method and functional film
Inventor: IWASE EIJIRO
IPC: C08J7/048
Filed: 2012-02-15
Abstract: PROBLEM TO BE SOLVED: To provide a functional film production method that can stably manufacture a high-performance functional film such as a gas barrier film having high gas barrier properties, and to provide the functional film.SOLUTION: A halogen-free organic layer is formed on a substrate using a coating material and a silicon nitride layer is formed on the organic layer by plasma CVD to solve a problem.
Patent JP-2013168556-A (JP)
Title: Method of manufacturing electronic device, electronic device, and electronic apparatus
Inventor: HASHI YUKIHIRO
IPC: H03H9/02
Filed: 2012-02-16
Abstract: PROBLEM TO BE SOLVED: To provide a method of manufacturing an electronic device capable of increasing airtightness of a space containing an electronic component.SOLUTION: A method of manufacturing an electronic device 100 comprises: a step of preparing an electronic component 40 and a substrate 10 including a through hole 16a; a step of integrally forming a mounting electrode 20a on one main surface 12 of the substrate 10, a packaged electrode 22a on the other main surface 14 of the substrate 10, and a penetrating electrode 24a in the through hole 16a by means of plating; and a step of mounting an electronic component 40 on the substrate 10.
Patent JP-2013166224-A (JP)
Title: Robot control apparatus, robot, and program thereof
Inventor: TANAKA MOTOYASU
IPC: B25J9/10
Filed: 2012-02-16
Abstract: PROBLEM TO BE SOLVED: To achieve a structure capable of driving deflection correction such that actuator performance can be effectively utilized, and actuator performance U does not exceed a first constraint value as an upper limit.SOLUTION: A target trajectory calculation means 101 uses a target value Xref and a second constraint value Uopt to calculate a target trajectory θref of a robot. A deflection correction trajectory θref is calculated from the target trajectory θref and a deflection correction amount Δθ to calculate actuator performance U necessary for achieving the deflection correction trajectory θref. A determination means 105 determines whether the actuator performance U is within a range of a first constraint value and whether a difference between them is within a range of a predetermined value. If the conditions are not satisfied, a constraint value change means 106 changes the second constraint value Uopt to repeat the calculation. If the conditions are satisfied, the deflection correction trajectory θref at that point is decided as the trajectory of the robot.
Patent JP-2013166129-A (JP)
Title: Objective metal ion adsorbent and method for producing the same
Inventor: TASAKI YUIKO
IPC: C07F9/30
Filed: 2012-02-16
Abstract: PROBLEM TO BE SOLVED: To provide an objective metal ion adsorbent capable of separating objective metal ions contained in a solution inexpensively with high versatility, capable of being easily and efficiently produced, and capable of being used repeatedly, and to provide a method for producing the same.SOLUTION: An objective metal ion adsorbent includes a metal complex containing a solid organophosphorus compound. A method for producing the objective metal ion adsorbent includes a precipitate generation process for immersing the metal complex containing a liquid organophosphorus compound in a mixture solution of at least two kinds of liquids and generating a precipitate containing the metal complex, and an objective metal ion adsorbent acquiring process for acquiring the objective metal ion adsorbent containing the metal complex from the precipitate.
Patent JP-2013170089-A (JP)
Title: Method for producing metal hydroxide and method for producing metal oxide powder
Inventor: BALAGOPAL N NAIR
IPC: C01B13/14
Filed: 2012-02-20
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing nano fine powder of a metal oxide dispersing easily into an organic solvent, and to provide a method for producing metal hydroxide usable suitably therefor.SOLUTION: In an acetylacetone cleaning step, hydroxide gel is washed by acetylacetone to allow the acetylacetone to work as a chelating agent, and to thereby bond a generated organic compound to the particle surface of the hydroxide (Y-OH). Then, a heat treatment is applied to the hydroxide to obtain YOpowder having the organic compound bonded to the surface thereof. Accordingly, the generated YOnano fine powder has excellent affinity to an organic solvent because the organic compound is bonded to the particle surface, and disperses easily into the organic solvent. Namely, the YOnano fine powder dispersing easily into the organic solvent can be obtained by a simple production step only for applying a washing treatment with a chelating agent followed by a heat treatment.