baber/WOPTO huggingface dataset:
Patent JP-2009141494-A (JP)
Title: Image processing system, image control method of frame image to be composed and photo-direct printer
Inventor: MIKAMI RURIKO
IPC: H04N1/60
Filed: 2007-12-04
Abstract: <P>PROBLEM TO BE SOLVED: To solve the problem that the burden of selection by a user increases due to an increase in options of frame image data in composite print.  <P>SOLUTION: Even if the number of options of frame image data increases, contents of information associated to the frame image data are compared to contents of information extracted from a captured image. An image processing system determines whether or not the frame image data should be recommended for the captured image on the basis of whether or not a result of comparison is a predetermined amount. Proper processing such as UI display facilitating user selection is executed on the basis of a result of determination, and thus, the burden of selection by the user can be reduced.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2009138995-A (JP)
Title: Heat exchanger
Inventor: SUNAHATA TAKUMI
IPC: F28D1/047
Filed: 2007-12-05
Abstract: <P>PROBLEM TO BE SOLVED: To provide a heat exchanger improved in the heat exchange efficiency of a peripheral area of a fin elongated hole hard to perform heat exchange inside the adjacent refrigerant pipes, also improved in heat exchange performance, and coping with the thinning of a material and rationalization.  <P>SOLUTION: In this heat exchanger 1, a zigzag refrigerant pipe 4 having straight pipe parts and bent pipe parts is pressed in elongated holes formed in plate fins 6. Only the straight part of the elongated hole formed in the plate fin 6 is provided with a drift 7, whereby heat exchange efficiency is improved, and the performance of the heat exchanger 1 is heightened to cope with the thinning of the material and rationalization.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2009136846-A (JP)
Title: Particle treatment system and particle treatment method
Inventor: YOSHIZAKI YASUHIRO
IPC: B03B9/06
Filed: 2007-12-11
Abstract: <P>PROBLEM TO BE SOLVED: To provide a particle treatment system which separates/removes a bulky material mixed in a treatment object and efficiently removes obstructive substances including water soluble components and heavy metals from particles while the amount of washing water is reduced by simplifying equipment.  <P>SOLUTION: A wet sorting means 2 which sorts the treatment object into the bulky material and the particles while washing it and classifies the particles into particulates and middle-sized particles having a particle size larger than that of the particulates are provided in the system. The wet sorting means sorts the bulky material into a bulky material having a larger specific gravity and a bulky material having a smaller specific gravity by a difference in specific gravity and classifies the particles into the particulates and the middle-sized particles having a larger particle size by a difference in sedimentation speed. A first washing means 4 for rewashing the particulates, a second washing means 6 for rewashing the middle-sized particles, a first circulation path 8 for returning washing drainage discharged from the first rewashing means to the wet sorting means, and a second circulation path 9 for returning washing drainage discharged from the second rewashing means to the second rewashing means are provided.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2008153661-A (JP)
Title: Method of measuring process parameter of semiconductor fabrication process using optical measurement
Inventor: CHU HANYOU
IPC: H01L21/027
Filed: 2007-12-12
Abstract: <P>PROBLEM TO BE SOLVED: To provide a method of measuring a process parameter of a semiconductor fabrication process using an optical measurement.  <P>SOLUTION: The fabrication process is performed on a first area using a first value of the process parameter. The fabrication process is next performed on a second area using a second value of the process parameter. Second measurements of the first and the second area are performed using an optical measuring device. One or more optical characteristics of the first area are determined based on the first measurement. One or more optical characteristics of the second area are determined based on the second measurement. The fabrication process is performed on a third area. A third measurement of the third area is performed using the optical measuring device. A third value of the process parameter is determined on the basis of the third measurement and a relation between the determined optical characteristics of the first area and the determined optical characteristics of the second area.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2009143833-A (JP)
Title: Extract of crude drug and skin external preparation having the same as active ingredient
Inventor: BANDO HIROTOMO
IPC: A61Q19/00
Filed: 2007-12-13
Abstract: <P>PROBLEM TO BE SOLVED: To provide an extract of a crude drug, a process for producing an extract of a crude drug and a photoaging inhibition skin external preparation having the obtained extract of a crude drug.  <P>SOLUTION: The extract of a crude drug is obtained by extraction of two-stage treatment comprising subjecting a dried product of a crude drug selected from scutellaria root, sophora flower, pueraria root, Gymnema sylvestre, geranium herb, plantago herb, and Areca to pressing wet heat treatment in a pressing wet heat treatment vessel in a saturated water vapor atmosphere of 105°C (19.5 kPaG) to 135°C (211.8 kPaG) and then subjecting the product thus treated to solvent extraction with a polar solvent. The obtained extract of scutellaria root alone or together with the extract from sophora flower, pueraria root, Gymnema sylvestre, geranium herb, plantago herb or areca seed is useful as a photoaging inhibition skin external preparation.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2009146683-A (JP)
Title: Manufacturing method of plasma display panel
Inventor: HOSOI KENTA
IPC: H01J11/24
Filed: 2007-12-13
Abstract: <P>PROBLEM TO BE SOLVED: To prevent the breakage and damage of a glass substrate, and to provide a method of obtaining many glass plates from one glass plate with a high yield.  <P>SOLUTION: A manufacturing method of the plasma display panel having a pair of glass substrates arranged opposite to each other to form a discharge space and having a through-hole 21 for sealing a discharge gas in a discharge space at the corner of at least one of the glass substrates includes steps of: preparing a sheet of base glass 30 which can be cut into at least three or more rows and three or more columns of the glass substrates 6; forming through-holes 21 of respective glass substrates 6 in the base glass 30 at positions which are symmetric with respect to the center point O of the base glass 30 and at the shortest distance from the end sides 76a, 76b, 76c and 76d of the base glass 30; and forming a constituent component of the plasma display panel on the base glass 30.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2009143467-A (JP)
Title: Protector for wire harness
Inventor: FUKUMOTO KOJI
IPC: B60R16/02
Filed: 2007-12-17
Abstract: <P>PROBLEM TO BE SOLVED: To provide a protector capable of being fixed to a rocker panel without mounting a separate clip.  <P>SOLUTION: This protector is for a wire harness wired along an upper surface of the rocker panel of a vehicle. The protector is provided with a bottom wall, a gutter-shaped protector body part provided with outside wall and inside wall projected from both sides of the width direction of the bottom wall and extended in the length direction, and a clip part having an opened lower end extending to the whole length of the length direction on an external surface of the outside wall of the protector body part. The cross sectional shape of the length direction is made to have the same shape. The clip part is fitted and locked from the above to a flange part projecting from the rocker panel and is fixed to the vehicle.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2009145724-A (JP)
Title: Projection optical system and exposure device with the same
Inventor: SUMIYOSHI YUHEI
IPC: G02B13/18
Filed: 2007-12-17
Abstract: <P>PROBLEM TO BE SOLVED: To provide a relatively compact projection optical system excellent in imaging performance.  <P>SOLUTION: The projection optical system 100 for projecting an image of a first object 101 onto a second object 102 includes: a first imaging optical system for forming a first intermediate image of the first object 101; a second imaging optical system G2 for forming a second intermediate image of the first object 101 based on a luminous flux from the first intermediate image, and having a concave mirror CM21; a third imaging optical system G3 for forming a third intermediate image of the first object 101 based on a luminous flux from the second intermediate image, and having a concave mirror CM31; a fourth imaging optical system G4 for forming an image of the first object 101 on the second object 102 based on a luminous flux from the third intermediate image; and a flat mirror FM1 which is disposed between a refractive member located closest to the third imaging optical system G3 along the optical path in the second imaging optical system G2 and a refractive member located closest to the second imaging optical system G2 along the optical path in the third imaging optical system G3, and reflects the luminous flux from the second imaging optical system G2 toward the third imaging optical system G3. The third imaging optical system G3 and the fourth imaging optical system G4 share the optical axis OA<SB>2</SB>.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2008125110-A (JP)
Title: Radio communication apparatus and radio communication system
Inventor: KOBAYASHI TAKAHIRO
IPC: H04B1/7143
Filed: 2007-12-17
Abstract: <P>PROBLEM TO BE SOLVED: To obtain a suitable communication state with a frequency-hopping multiplex system.  <P>SOLUTION: A radio base station compares a plurality of hopping pattern information indicative of a hopping pattern from among a plurality of radio communication apparatuses, and generates a collision information indicative of whether hopping patterns collides among each radio communication apparatus. Each radio communication apparatus receives a OFDM (orthogonal frequency division multiplex) signal from the radio base station and transmits a FH (frequency hopping) signal to the radio base station. At the radio communication apparatus, an estimation means 15 estimates the propagation path response, based on the signal received from the radio base station. A selection means 16 selects a plurality of sub channels, having a value for the propagation path response which is larger than some value. A determination means 17 determines a hopping pattern from among the plurality of sub channels. A transmission means 21 transmits a hopping pattern information indicative of the hopping pattern, to the radio base station. A reception means 18 receives the collision information from the radio base station. A modification means 17 modifies the determined hopping pattern, based on the collision information.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2009153273-A (JP)
Title: Signal generator
Inventor: SATO REIJI
IPC: H02K5/22
Filed: 2007-12-19
Abstract: <P>PROBLEM TO BE SOLVED: To provide a signal generator capable of improving vibration resistance at a connecting portion between an electrical cord and a terminal fitting, and eliminating troublesome work of applying adhesive to the connecting portion.  <P>SOLUTION: In this signal generator 11, a signal generator body having a signal coil wound around an iron core and a permanent magnet magnetically jointed to the iron core is housed in an insulation case 12. Terminal fittings 16, 16 connected to the both sides of the signal coil are attached to a wall portion 12b of the insulation case 12. Cord holders 12g, 12h that retain a pair of electrical cords 17, 17 where core conductors are soldered respectively to the terminal portions 16a, 16a of a pair of the terminal fittings in such a state to run along the back face of the insulation case 12 are fixed to the wall portion 12b on the back face side of the insulation case 12. The cord holders have portions 12h, 12h that individually retain a pair of the electrical cords 17, 17 at a position adjacent to the terminal portions 16a, 16a of the terminal fitting.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2008174226-A (JP)
Title: Pneumatic tire
Inventor: YAMAGUCHI MASASHI
IPC: B60C11/13
Filed: 2007-12-21
Abstract: <P>PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of maintaining normal traveling performance and efficiently reducing the temperature of the tire.  <P>SOLUTION: This pneumatic tire is provided with a projection 17 for generating turbulence on the surface of the tire. The projection 17 is provided with a front rugged part 17 projected and recessed toward a tire rotating direction on a front side of a projection center line CL passing through a center of a tire rotating direction width of the projection 17 and perpendicular to the tire rotating direction.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2009151238-A (JP)
Title: Image forming device
Inventor: OKADA NORIYUKI
IPC: G03G15/01
Filed: 2007-12-21
Abstract: <P>PROBLEM TO BE SOLVED: To provide an image forming device strictly reproducing the glossiness of a document without large cost increase.  <P>SOLUTION: This image forming device has CCD 306 which reads the image information of a document, an image forming section 150 which forms an image on a recording sheet with colored toner and colorless toner according to the image information read by the CCD 306, CCD 310 which detects the glossiness of the document, and CPU 100 which determines the image forming conditions of the colorless toner by the image forming section 150 according to the glossiness of the document detected by the CCD 310 and the glossiness of the recording sheet.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2009159030-A (JP)
Title: Video delivery system
Inventor: YANAGI YASUHIRO
IPC: G09G5/377
Filed: 2007-12-25
Abstract: <P>PROBLEM TO BE SOLVED: To provide a video delivery system which facilitates imitation of the movement of a person in a content video image accurately to the right and left.  <P>SOLUTION: A video delivery system 1 includes a server 10, a camera 30, a display monitor 40, and a video control section 50. The server 10 stores a video image representing the movement of a person in a content video image. The camera 30 photos a user. The display monitor 40 displays the content video image together with the video image of a user photoed by means of the camera 30. The video control section 60 performs switching between reversal processing and non-reversal processing with regard to the video image of a person in a content video image which is displayed on the display monitor 40 in accordance with the photography direction when photoing the video image of a person in a content video image, and performs switching between reversal and non-reversal by synchronizing the video image photoed by means of the camera 30 with the video image of a person in a content video image.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2009157003-A (JP)
Title: Accessory device
Inventor: TAKANO HIRONOBU
IPC: G03B17/02
Filed: 2007-12-26
Abstract: <P>PROBLEM TO BE SOLVED: To provide an accessory device comprising a connection part of high reliability.  <P>SOLUTION: The accessory device includes the connection part slid and connected to an accessory shoe of an imaging apparatus. The connection part includes a contact point for electrical connection to the imaging apparatus; a contact holding member for holding the contact point and sliding in a first direction and a second direction opposite to the first direction in a space held by a first engaging part and a second engaging part of the accessory shoe; a rotating member capable of rotating operation; and a moving member linearly movable in a third direction and a fourth direction opposite to the third direction by the rotating operation of the rotating member. The moving member includes an abutting surface which abuts on the first engaging part and the second engaging part by moving in the fourth direction, and a projecting part which abuts on the first engaging part and the second engaging part to prevent the accessory device from sliding in the second direction.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2008166809-A (JP)
Title: Method for forming germanium silicide and semiconductor device having germanium silicide
Inventor: RYO GENTOKU
IPC: H01L29/78
Filed: 2007-12-27
Abstract: <P>PROBLEM TO BE SOLVED: To provide a method for depositing germanium silicide and a device having germanium silicide.  <P>SOLUTION: The method for depositing germanium silicide includes the step of offering a substrate at least a partial region of which consists of silicon germanium, the step of depositing a metallization layer on the silicon germanium, and the step of heat-treating a substrate having a metallization layer under a high pressure to deposit germanium silicide, in addition the semiconductor device having the germanium silicide is provided.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2009160123-A (JP)
Title: Diving face mask
Inventor: KURODA YUJI
IPC: A63B33/00
Filed: 2007-12-28
Abstract: <P>PROBLEM TO BE SOLVED: To provide a diving face mask improved to facilitate lens exchange.  <P>SOLUTION: The diving face mask includes: a pair of right and left front lenses 2; a lens frame 4 provided with an outer frame 7 having a pair of lens holders 6 in which the lenses 2 are detachably mounted from front, and an inner frame 8 having a pair of annular portions 30 adapted to be detachably snap engaged with an inner peripheral surface of the lens holders 6; a cylindrical skirt 5 extending rearward from the lens frame 4; and a strap 9 adapted to be put around the wearer's head. The inner frame 8 includes a pair of the integrally formed annular portions and is formed with a notch portion 33 into which a connector member 34 prepared separately of the inner frame 8 is detachably fitted.  <P>COPYRIGHT: (C)2009,JPO&INPIT
Patent JP-2007527793-A (JP)
Title: 反応器用のガス分配器
IPC: B01J8/24
Filed: 2005-03-07
Abstract: 反応器（２１）用のスパージャーシステム（１０）が、スパージャーの上方に配置された分配システムを介して反応器の床板上のスパージャーに反応物を供給するための供給管を備える。ガス又は他の反応物を床板全体に放出するために、一般にスパージャーの出口（１２）は床板の方向を向いているか又は床板に平行な方向に向いている。これにより、反応器の床板上への触媒の沈降が抑制されることで、スラリーの混合が改善され、制御されない反応に関連した問題が緩和される。
Patent JP-2007528556-A (JP)
Title: 遠隔区域における圧力を制御するシステム及び方法
IPC: F16K31/36
Filed: 2005-02-01
Abstract: ｉを１からＮまでの整数としてｉ個の区域に管を介して接続可能なｉ個のラインを流れる流体フローを制御するシステムである。このシステムは、ｉ個のラインのそれぞれにおける少なくとも１つの弁と圧力トランスデューサと、弁を制御する制御装置と、区域圧力評価計とを含む。区域圧力評価計は圧力トランスデューサに接続されており、ｉ個の区域のそれぞれにおける評価された圧力を計算し、評価された圧力を制御装置に提供する。
Patent JP-2007532227-A (JP)
Title: 広視野超音波イメージングプローブ
IPC: G10K11/32
Filed: 2005-04-12
Abstract: 本開示の実施例によれば、広視野超音波プローブ（１２）は、互いに対して角度をなしてプローブ（１２）内に配置された２つの平らなマトリックスアレイ・サブアセンブリ（４０，４２）を含む。各サブアセンブリ（４０，４２）からの情報は、広角画像視野に対応したデータを生成するために結合される。
Patent JP-2007533586-A (JP)
IPC: B01J29/89
Filed: 2004-04-20
Abstract: A family of microporous aluminosilicate zeolites and substituted versions thereof which are identified as UZM-8 and UZM-8HS have been prepared. These UZM-8 compositions can be prepared using either only one or more organoammonium cations, such as diethyldimethylammonium or ethyltrimethylammonium cations and optionally an alkali and/or an alkaline earth cation as structure directing agents. The UZM-8 compositions are described by an empirical formula of Mm<n+>Rr<p+>Al1-xExSiyOz and have a unique x-ray diffraction pattern. The UZM-8HS are derived from the UZM-8 zeolites and have a lower aluminum content than the UZM-8 compositions. These UZM-8HS are represented by the empirical formula M'm'<n+>Rr'<p+>Al(1-x)ExSiy'Oz' and are prepared by treatments such as acid extraction and AFS treatments. Both the UZM-8 and UZM-8HS are useful in various hydrocarbon conversion processes.
Patent JP-2007537063-A (JP)
IPC: C08L51/04
Filed: 2005-05-17
Abstract: The invention relates to a molded body consisting of plastic with a material thickness of at least 150 $g(m)m at any point. Said body contains a polymer mixture of an impact-resistance modified poly(meth)acrylate plastic, a polymethyl methacrylate matrix, elastomer particles contained in said matrix and a fluoropolymer. According to the invention, the fraction of the fluoropolymer in the mixture is between 30 and 95 wt. % and the polymer mixture of the impact-resistance modified poly(meth)acrylate plastic and the fluoropolymer is present in an outer layer with a continuous material thickness of at least 10 $g(m)m. The invention is characterized in that the impact-resistance modified poly(meth)acrylate plastic consists of between 20 and 70 wt. % poly(meth)acrylate matrix and between 30 and 80 wt. % elastomer particles.
Patent JP-2007535962-A (JP)
Title: 化合物のキャラクタリゼーション法
IPC: C12M1/00
Filed: 2005-05-05
Abstract: 宿主細胞内での情報伝達経路及び／又は細胞プロセスに対する被験因子の活性及び／又は機能のインビトロキャラクタリゼーション法であって、生細胞で非破壊的に実施される方法について開示する。本発明の方法はイメージング装置及びコンピューター化されたデータ処理装置と共に使用できる。 【選択図】    なし
Patent JP-2007537475-A (JP)
Title: 鏡機能付き表示装置及び携帯情報装置
IPC: G02B5/08
Filed: 2005-04-27
Abstract: 本発明は周囲の暗い状況においても鏡機能を遺憾なく利用することのできる表示装置を提供することを目的とする。表示装置は、１の状態において表示すべき情報を表示し他の状態において外光を反射して鏡を形成する像形成手段（５０，６０，７０，７１）と、鏡機能実行指令を入力する入力手段（３０）と、鏡機能実行指令に応答して像形成手段を他の状態に切り換える制御手段（８２）とを有する表示装置。この装置は、他の状態において当該鏡（６０）に映すべきオブジェクトに光を照射するための照明ユニット（９１）をさらに有する。
Patent JP-2008501294-A (JP)
Title: 無線通信に使用される受信機、及び当該受信機を使用する方法及び端末
IPC: H03K9/06
Filed: 2005-04-25
Abstract: 周波数変調ＲＦ信号を受信し、そして直接変換方式によって復調する無線受信機（２００）であって、前記受信機は入力信号経路（１０１）と、局部発振器（１１１）と、局部発振器からの出力基準信号を入力受信信号と混合して同相成分を生成する第１ミキサ（１０７）と、入力信号経路に接続される直交位相シフター（１１３）と、位相シフターからの出力信号を入力受信信号と混合して直交成分を生成する第２ミキサ（１０９）と、そして出力復調情報信号を、同相成分及び直交成分の合成関数を生成することにより生成する手段（２１８）と、を備え、更に同相成分と直交成分との間の相対位相差の誤差を周期的に検出する手段（２１４）と、そして位相差の相対調整量を付加して検出誤差を相殺する手段（２１７）と、を実現することを特徴とする。
Patent JP-2008502208-A (JP)
Title: Ｆｅｃコード化されたイーサネット（登録商標）フレームにおけるデータをデリニエートするための方法および装置
IPC: H04L12/56
Filed: 2005-05-18
Abstract: 順方向誤り修正（ＦＥＣ）コード化されたイーサネット（登録商標）フレームの構築を容易にするシステムが提供される。動作時システムは従来のイーサネット（登録商標）フレームを受信する。次にシステムは、従来のイーサネット（登録商標）フレーム用に多数のＦＥＣパリティビットを生成し、従来のイーサネット（登録商標）フレームの前に開始シーケンスを挿入する。次にシステムは、偶数または奇数デリミタ（ＴＦＥＣ＿Ｅ  ２１０、ＴＦＥＣ＿０  ２２０）を従来のイーサネット（登録商標）フレームに添付する。従来のイーサネット（登録商標）フレームの最後にある記号が奇数位置の場合、偶数デリミタは従来のイーサネット（登録商標）フレームをＦＥＣパリティビットから分離するために使用される。最後にある記号が偶数位置の場合、奇数デリミタは従来のイーサネット（登録商標）フレームをＦＥＣパリティビットから分離するために使用される。
Patent JP-2008502870-A (JP)
Title: 節水のための施設、装置および方法
IPC: E03B1/04
Filed: 2005-06-13
Abstract: 水を節約するための施設、装置および方法。   温水回路および冷水回路ならびに両方の回路のための少なくとも１つの共通の水分配点を備えるタイプの流水を消費する施設であって、冷水回路が、温水回路より低い圧力で動作することと、温水回路および冷水回路のための共通の水分配点の所に配置され、ユーザが作動させることができ、温水回路からの水が水分配点を経由して冷水回路へ通過することを可能にする制御要素を備える少なくとも１つの装置と、好ましくは感温手段を用いて両方の回路が連通している時間を決定する装置と、冷水回路内に設置された、温水回路から得られる水量を放出するための手段を特徴とする流水を消費する施設。
Patent JP-2008504595-A (JP)
Title: 更新可能かつプライベートなバイオメトリクス
IPC: G07C9/00
Filed: 2005-06-22
Abstract: 本発明は、認証装置（３１１）において個体（３２１）を認証する方法および個体を認証するための認証システムに関する。本発明の基本的な発想は、個体が自分を認証したい装置またはシステムにおいて一つまたは複数のデータ構造を保存し、そのそれぞれが当該個体に属する識別子に基づく値および該識別子の暗号化されたコピーを含むというものである。個体が自らを認証したいとき、個体は認証装置にコンタクトし、それにより認証装置に保存されている特定のデータ構造に含まれる暗号化された識別子を入手する要求がなされる。その後、個体は実際に識別子を知っているという証明を認証装置に提供する。
Patent JP-2008504782-A (JP)
IPC: H04L12/56
Filed: 2005-06-07
Abstract: A medical ad hoc wireless network (10) is deployed in a healthcare medical facility surrounding individual patients and including wireless nodes (A, B, . . . , Z). Before deployment, each node (A, B, . . . , Z) is pre-initialized with a public key certificate (22) and offers a trust and symmetric key distribution service (32). In joining the ad hoc network (10), a node (B) authenticates and registers to one randomly self-chosen node (A) by using certified public keys (20). Such node (A) becomes Trusted Portal (TPA) of the node (B). The node (B) dynamically registers to a new self-chosen TP node when its old TP node leaves the ad hoc network (10). The network (10) supports symmetric key authentication between nodes registered to the same TP node. Additionally, it supports symmetric key authentication between nodes registered to different TP nodes.