JPH06194962A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH06194962A JPH06194962A JP34457492A JP34457492A JPH06194962A JP H06194962 A JPH06194962 A JP H06194962A JP 34457492 A JP34457492 A JP 34457492A JP 34457492 A JP34457492 A JP 34457492A JP H06194962 A JPH06194962 A JP H06194962A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- developer
- sleeve
- magnetic pole
- developing
- 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
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はトナーと磁性キャリアを
含む２成分現像剤を用いて静電潜像を現像する現像装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device for developing an electrostatic latent image by using a two-component developer containing toner and magnetic carrier.
【０００２】[0002]
【従来の技術】現像部で静電潜像を現像した後の２成分
現像剤層にはトナー濃度のムラが生ずるので、現像スリ
ーブ内に設けた固定磁石に、現像部よりも現像スリーブ
回転方向下流側で、互いに隣りあった同極性の第１と第
２の磁極を設け、この２つの磁極の形成する反発磁界に
より現像剤を現像スリーブから除去し、反発磁界中に配
置された回転撹拌部材により上記除去された現像剤を撹
拌してトナー濃度を均一化し、そしてこのトナー濃度を
均一化させた現像剤を回転撹拌部材により第２の磁極側
で現像スリーブに供給することが行われている。2. Description of the Related Art Since a toner density unevenness occurs in a two-component developer layer after an electrostatic latent image is developed in a developing section, a fixed magnet provided in the developing sleeve is installed in a direction of rotation of the developing sleeve rather than in the developing section. On the downstream side, adjacent first and second magnetic poles of the same polarity are provided, the repulsive magnetic field formed by these two magnetic poles removes the developer from the developing sleeve, and the rotary stirring member is placed in the repulsive magnetic field. The developer thus removed is stirred to make the toner concentration uniform, and the developer having the uniform toner concentration is supplied to the developing sleeve on the second magnetic pole side by the rotary stirring member. .
【０００３】これにより現像画像に現像履歴に起因する
濃度ムラが発生するのを防止するようになっている。As a result, it is possible to prevent the occurrence of density unevenness in the developed image due to the development history.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、反発磁
界によっては現像剤を現像スリーブから完全に除去でき
るものではなく、現像スリーブに付着したまま第１磁極
側から第２磁極側に移動してしまう現像剤も存在する。However, depending on the repulsive magnetic field, the developer cannot be completely removed from the developing sleeve, and the developing agent moves from the first magnetic pole side to the second magnetic pole side while adhering to the developing sleeve. There are agents.
【０００５】特にトナーが体積平均粒径４〜１０μｍ程
度の小粒径トナーであったり、磁性キャリアが体積平均
粒径が２０〜５０μｍ程度の小粒径キャリアであるよう
な場合は、トナーやキャリアの単位重量当りの摩擦電荷
が相対的に大になって現像スリーブに対する静電的付着
力が強くなり、反発磁界によっても現像剤は現像スリー
ブから十分に除去できなくなる。Particularly when the toner is a small particle size toner having a volume average particle size of about 4 to 10 μm, or the magnetic carrier is a small particle size carrier having a volume average particle size of about 20 to 50 μm, the toner or the carrier is used. The triboelectric charge per unit weight becomes relatively large and the electrostatic adhesion force to the developing sleeve becomes strong, and the developer cannot be sufficiently removed from the developing sleeve even by the repulsive magnetic field.
【０００６】いずれにせよ、現像部を通過した現像剤が
現像スリーブから除去されることなく再び現像部に到来
すると現像画像の濃度にムラが生じ、高精細の画像が得
られなくなる。In any case, if the developer that has passed through the developing section reaches the developing section again without being removed from the developing sleeve, the density of the developed image becomes uneven, and a high-definition image cannot be obtained.
【０００７】また、現像スリーブから現像剤が十分除去
されないまま長期間現像装置を運転すると、現像剤の劣
化が促進され、現像画像の濃度低下やカブリが生じて来
るという問題もある。Further, if the developing device is operated for a long period of time without sufficiently removing the developer from the developing sleeve, there is a problem that the deterioration of the developer is promoted and the density of the developed image and fog occur.
【０００８】従って本発明の目的は、反発磁界により現
像後の現像剤を現像スリーブから除去しやすくし、回転
撹拌部材にこの除去された現像剤を供給しやすくした現
像装置を提供することである。Therefore, an object of the present invention is to provide a developing device which makes it easier to remove the developer after development from the developing sleeve by the repulsive magnetic field and to easily supply the removed developer to the rotary stirring member. .
【０００９】[0009]
【課題を解決するための手段】本発明の現像装置は、ト
ナーと磁性キャリアを含む２成分現像剤を担持して静電
潜像を現像する現像部に搬送する回転現像スリーブと、
この現像スリーブ内に配置された固定磁石であって、現
像部を通過した現像剤が到達する位置に設けられた第１
の磁極と、上記現像スリーブの回転方向に関してこの第
１の磁極の下流側であり、かつ第１の磁極と隣接して設
けられた、第１の磁極と同極性の第２の磁極とを有する
固定磁石と、上記現像スリーブに対向して設けられ、第
１の磁極側で現像スリーブから剥離された現像剤を受け
取り、第２の磁極側で現像スリーブ上へ現像剤を付与す
る回転撹拌部材と、現像スリーブと回転撹拌部材の間で
あり、かつ第１の磁極と、第１、第２磁極間の磁束密度
が最小となる位置との間で現像スリーブに対向して配置
され、第１の磁極により誘導磁化されて現像スリーブか
ら現像剤を除去する磁性部材と、を備えた現像装置、で
ある。A developing device of the present invention comprises a rotary developing sleeve for carrying a two-component developer containing a toner and a magnetic carrier and carrying it to a developing section for developing an electrostatic latent image.
A fixed magnet disposed in the developing sleeve, the first magnet being provided at a position where the developer passing through the developing unit reaches.
And a second magnetic pole that is provided downstream of the first magnetic pole with respect to the rotation direction of the developing sleeve and adjacent to the first magnetic pole and that has the same polarity as the first magnetic pole. A fixed magnet and a rotary stirring member that is provided so as to face the developing sleeve, receives the developer separated from the developing sleeve on the first magnetic pole side, and applies the developer onto the developing sleeve on the second magnetic pole side. A first magnetic pole and a position where the magnetic flux density between the first and second magnetic poles is minimum, between the developing sleeve and the rotary stirring member, and the first magnetic pole is disposed so as to face the developing sleeve. And a magnetic member that is induced and magnetized by a magnetic pole to remove the developer from the developing sleeve.
【００１０】[0010]
【実施例】以下に本発明の実施例を添付図面に基づいて
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１１】図１は電子写真感光ドラム１の側方に配設
される現像装置２の断面を示しており、該現像装置２で
は磁性粒子のキャリアと非磁性粒子のトナーとからなる
２成分現像剤１５が使用され、磁気ブラシ現像法によっ
て感光ドラム１上の潜像が現像されるようになってい
る。FIG. 1 shows a cross section of a developing device 2 disposed on the side of the electrophotographic photosensitive drum 1. In the developing device 2, two-component development comprising carrier of magnetic particles and toner of non-magnetic particles is shown. The agent 15 is used to develop the latent image on the photosensitive drum 1 by the magnetic brush developing method.
【００１２】この現像装置２は磁力の作用で現像剤をそ
の外周部に吸着しつつ矢印Ａ方向に回転して、現像剤中
のトナーを感光ドラム１の方へ供給する円筒状の非磁性
現像スリーブ２０と、該現像スリーブ２０内に固定状態
で配設され、その外方に向かって所定の磁極Ｓ1，Ｓ2，
Ｎ1，Ｎ2，Ｎ3が形成された磁石２１と、現像スリーブ
２０上に吸着され、静電潜像を現像する現像部Ｄに搬送
される現像剤の層厚を規制する現像剤層厚規制ブレード
２２を有している。This developing device 2 rotates in the direction of arrow A while attracting the developer to the outer peripheral portion thereof by the action of magnetic force, and supplies the toner in the developer to the photosensitive drum 1 in a cylindrical non-magnetic developing manner. The sleeve 20 and the developing sleeve 20 are fixedly disposed in the developing sleeve 20, and outwardly of the predetermined magnetic poles S 1 , S 2 ,
A magnet 21 on which N 1 , N 2 and N 3 are formed, and a developer layer thickness that regulates the layer thickness of the developer that is attracted to the developing sleeve 20 and is conveyed to the developing unit D that develops the electrostatic latent image. It has a regulation blade 22.
【００１３】現像部Ｄで潜像の現像を終えた現像剤層は
スリーブ２０に担持されて現像容器１０内に戻って来
る。After the latent image has been developed in the developing section D, the developer layer is carried by the sleeve 20 and returns to the inside of the developing container 10.
【００１４】前述のように、現像部Ｄに対してスリーブ
回転方向Ａの下流側には互いに隣り合う２つの磁極
Ｎ1，Ｎ2が配置されている。この２つの磁極Ｎ1，Ｎ2は
同極性の磁極であり、回転方向Ａに関して上流側の第１
磁極Ｎ1は、現像部Ｄを通過した現像剤を容器１０内に
搬送するのに寄与し、一方、回転方向Ａに関して下流側
の第２磁極Ｎ2は、後述スクリュー２３で撹拌搬送され
る現像剤をスリーブ２０上に磁気力で汲み上げるのに寄
与している。As described above, the two magnetic poles N 1 and N 2 adjacent to each other are arranged on the downstream side in the sleeve rotation direction A with respect to the developing section D. These two magnetic poles N 1 and N 2 are magnetic poles of the same polarity, and are the first magnetic poles on the upstream side in the rotational direction A.
The magnetic pole N 1 contributes to the conveyance of the developer having passed through the developing section D into the container 10, while the second magnetic pole N 2 on the downstream side in the rotation direction A is agitated and conveyed by the screw 23 to be described later. It contributes to magnetically pumping the agent onto the sleeve 20.
【００１５】更に、第１、第２磁極Ｎ1，Ｎ2は上述のよ
うに同極性であるので、両磁極間に反発磁界が形成され
る。このように反発磁界が形成されることによって、ス
リーブにスイレーパのようなものを圧接させなくても、
現像剤は磁気力によってスリーブ２０から剥離される。Further, since the first and second magnetic poles N 1 and N 2 have the same polarity as described above, a repulsive magnetic field is formed between both magnetic poles. By forming a repulsive magnetic field in this way, even if you do not press something like a wiper on the sleeve,
The developer is separated from the sleeve 20 by the magnetic force.
【００１６】即ち、第１磁極Ｎ1と第２磁極Ｎ2との間の
スリーブ周面上に磁束密度が最小となる位置Ｐが存在
し、現像剤は磁極Ｎ1の位置と位置Ｐの間でスリーブ２
０から剥離除去される。That is, there is a position P where the magnetic flux density is minimum on the sleeve peripheral surface between the first magnetic pole N 1 and the second magnetic pole N 2, and the developer is between the position of the magnetic pole N 1 and the position P. With sleeve 2
Stripped from 0.
【００１７】（尚、本明細書で磁極の位置と言うのは、
その磁極によるスリーブ周面上での磁束密度がピークと
なるスリーブ周面上での位置の事を言い、また磁束密度
というのはスリーブ周面に対する法線方向の磁束密度成
分の事を言うものとする。）(In this specification, the position of the magnetic pole means
The magnetic flux density refers to the position on the sleeve peripheral surface where the magnetic flux density on the sleeve peripheral surface reaches a peak, and the magnetic flux density refers to the magnetic flux density component in the direction normal to the sleeve peripheral surface. To do. )
【００１８】上記反発磁界中には第１スクリュー２３が
スリーブ２０と対向して配置されている。スクリュー２
３は２つの磁極Ｎ1，Ｎ2の間の位置でスリーブ２０に最
近接している。第１スクリュー２３は矢印方向に回転
し、現像剤を撹拌しつつスリーブ２０の長手方向に沿っ
て搬送する。The first screw 23 is arranged to face the sleeve 20 in the repulsive magnetic field. Screw 2
3 is closest to the sleeve 20 at a position between the two magnetic poles N 1 and N 2 . The first screw 23 rotates in the arrow direction and conveys the developer along the longitudinal direction of the sleeve 20 while stirring the developer.
【００１９】一方、隔壁１４を間にしてもう１つのスク
リュー２４が配置されている。このスクリュー２４は現
像剤を撹拌しつつ、スクリュー２３によるのとは逆向き
の方向に搬送する。On the other hand, another screw 24 is arranged with the partition wall 14 in between. The screw 24 stirs the developer and conveys it in a direction opposite to that of the screw 23.
【００２０】隔壁１４の図上手前側と奥側には夫々開口
が設けられていて、スクリュー２３で搬送された現像剤
は一方の開口を通してスクリュー２４に渡され、スクリ
ュー２４で搬送された現像剤は他方の開口を通してスク
リュー２３に渡される。Openings are provided on the front side and the back side of the partition wall 14 in the figure. The developer carried by the screw 23 is passed to the screw 24 through one opening, and the developer carried by the screw 24 is It is passed to the screw 23 through the other opening.
【００２１】現像部Ｄが消費されたトナー量に見合う量
のトナーが開口１８を通してスクリュー２４上に供給さ
れ、現像剤のトナー濃度が一定に維持される。An amount of toner commensurate with the amount of toner consumed in the developing section D is supplied onto the screw 24 through the opening 18, and the toner concentration of the developer is maintained constant.
【００２２】さて、磁極Ｎ1位置と位置Ｐとの間であっ
て、かつスリーブ２０とスクリュー２３との間の位置に
於いて、スリーブ２０に対向して磁性体５１が配置され
ている。この磁性体５１は直径が０．５〜３ｍｍ程度の
丸棒状或いは角棒状の鉄やニッケルであり、スリーブ２
０と０．５〜２ｍｍ程度の間隔をおいて、スリーブ２０
と平行に配置されている。Now, between the magnetic pole N 1 position and the position P, and between the sleeve 20 and the screw 23, the magnetic body 51 is arranged facing the sleeve 20. The magnetic body 51 is iron or nickel in the shape of a round bar or a square bar having a diameter of about 0.5 to 3 mm, and the sleeve 2
The sleeve 20 is spaced apart from 0 to about 0.5 to 2 mm.
It is arranged in parallel with.
【００２３】上記磁性体５１は磁極Ｎ1により誘導磁化
され、スリーブ２０と磁性体５１との間に現像剤の磁気
ブラシを形成する。The magnetic body 51 is induction-magnetized by the magnetic pole N 1 and forms a magnetic brush of developer between the sleeve 20 and the magnetic body 51.
【００２４】而して、前記の通り反発磁界が形成される
ので、磁極Ｎ1から磁極Ｎ2への現像剤の搬送力は元々弱
い上に、上記の磁気ブラシの形成によって、現像剤はス
リーブ２０から略完全に除去され、そして磁性体５１に
よって除去された現像剤は矢印１１に示すようにスクリ
ュー２３上に落下し、スクリュー２３に取り込まれる。
即ち、磁性体５１はスリーブ２０からスクリュー２３へ
の現像剤の受け渡しの仲介の機能も持つ。As described above, since the repulsive magnetic field is formed as described above, the developer carrying force from the magnetic pole N 1 to the magnetic pole N 2 is originally weak, and due to the formation of the above magnetic brush, the developer is sleeved. The developer that has been almost completely removed from 20 and has been removed by the magnetic material 51 drops onto the screw 23 as shown by the arrow 11, and is taken into the screw 23.
That is, the magnetic body 51 also has a function of mediating the transfer of the developer from the sleeve 20 to the screw 23.
【００２５】磁性体５１によってスリーブから一旦除去
された現像剤が、スクリュー２３によって十分撹拌され
る前に磁極Ｎ2によりスリーブに再び汲み上げられるこ
とのないように、磁性体５１はスリーブ２０とスクリュ
ー２３の最近接点よりも、スリーブ回転方向上流側に位
置させることが好ましい。The magnetic material 51 is provided with a sleeve 20 and a screw 23 so that the developer once removed from the sleeve by the magnetic material 51 is not pumped up again into the sleeve by the magnetic pole N 2 before being sufficiently stirred by the screw 23. It is preferable to position it on the upstream side of the closest contact point in the sleeve rotation direction.
【００２６】さて、スクリュー２３で十分撹拌された現
像剤は、磁極Ｎ2の磁力によって矢印１２に示すよう
に、再びスリーブ２０に汲み上げられる。スリーブ上で
の現像剤汲み上げ地点Ｑは、位置Ｐよりもスリーブ回転
方向下流となる。The developer sufficiently stirred by the screw 23 is again pumped up to the sleeve 20 by the magnetic force of the magnetic pole N 2 , as shown by the arrow 12. The developer drawing-up point Q on the sleeve is downstream of the position P in the sleeve rotation direction.
【００２７】再びスリーブ２０に汲み上げられた現像剤
は、ブレード２２で層厚規制され、現像部Ｄに搬送され
る。The developer drawn up into the sleeve 20 is regulated by the blade 22 to a layer thickness, and is conveyed to the developing section D.
【００２８】[0028]
【発明の効果】本発明によれば、現像後の２成分現像剤
を反発磁界によりスリーブから十分除去でき、かつその
除去された現像剤を撹拌部材に良好に取り込ませること
ができるので、現像画像の濃度ムラや現像剤の劣化を防
止することができる。According to the present invention, the two-component developer after development can be sufficiently removed from the sleeve by the repulsive magnetic field, and the removed developer can be satisfactorily taken into the stirring member. It is possible to prevent uneven density and deterioration of the developer.
【図１】本発明の実施例の説明図。FIG. 1 is an explanatory diagram of an embodiment of the present invention.
２０ 現像スリーブ ２１ 磁石 ２３ 第１撹拌スクリュー ５１ 磁性体 Ｎ1 第１磁極 Ｎ2 第２磁極20 developing sleeve 21 magnet 23 first stirring screw 51 magnetic material N 1 first magnetic pole N 2 second magnetic pole
Claims (1)
剤を担持して静電潜像を現像する現像部に搬送する回転
現像スリーブと、この現像スリーブ内に配置された固定
磁石であって、現像部を通過した現像剤が到達する位置
に設けられた第１の磁極と、上記現像スリーブの回転方
向に関してこの第１の磁極の下流側であり、かつ第１の
磁極と隣接して設けられた、第１の磁極と同極性の第２
の磁極とを有する固定磁石と、上記現像スリーブに対向
して設けられ、第１の磁極側で現像スリーブから剥離さ
れた現像剤を受け取り、第２の磁極側で現像スリーブ上
へ現像剤を付与する回転撹拌部材と、現像スリーブと回
転撹拌部材の間であり、かつ第１の磁極と、第１、第２
磁極間の磁束密度が最小となる位置との間で現像スリー
ブに対向して配置され、第１の磁極により誘導磁化され
て現像スリーブから現像剤を除去する磁性部材と、を備
えた現像装置。1. A rotary developing sleeve for carrying a two-component developer containing toner and a magnetic carrier and carrying it to a developing section for developing an electrostatic latent image, and a fixed magnet arranged in the developing sleeve. A first magnetic pole provided at a position where the developer passing through the developing unit reaches, and a first magnetic pole provided downstream of the first magnetic pole in the rotation direction of the developing sleeve and adjacent to the first magnetic pole. Also, a second pole having the same polarity as the first magnetic pole.
A fixed magnet having a magnetic pole and a developer which is provided so as to face the developing sleeve and is separated from the developing sleeve on the side of the first magnetic pole, and the developer is applied onto the developing sleeve on the side of the second magnetic pole. Between the developing sleeve and the rotary stirring member, and the first magnetic pole and the first and second magnetic poles.
A developing device, comprising: a magnetic member that is disposed so as to face the developing sleeve between a position where the magnetic flux density between the magnetic poles is minimum, and that is magnetized by the first magnetic pole to remove the developer from the developing sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04344574A JP3109931B2 (en) | 1992-12-24 | 1992-12-24 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04344574A JP3109931B2 (en) | 1992-12-24 | 1992-12-24 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06194962A true JPH06194962A (en) | 1994-07-15 |
| JP3109931B2 JP3109931B2 (en) | 2000-11-20 |
Family
ID=18370331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04344574A Expired - Fee Related JP3109931B2 (en) | 1992-12-24 | 1992-12-24 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3109931B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266507B1 (en) | 1998-09-28 | 2001-07-24 | Sharp Kabushiki Kaisha | Developing device having low turbulence developer flow |
| US6317576B1 (en) | 1999-01-22 | 2001-11-13 | Sharp Kabushiki Kaisha | Electrophotographic developing unit |
| KR100719419B1 (en) * | 2000-05-16 | 2007-05-18 | 후지쯔 가부시끼가이샤 | Analog switch circuit |
| KR100729691B1 (en) * | 2000-05-16 | 2007-06-18 | 후지쯔 가부시끼가이샤 | Operational amplifier circuit |
-
1992
- 1992-12-24 JP JP04344574A patent/JP3109931B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266507B1 (en) | 1998-09-28 | 2001-07-24 | Sharp Kabushiki Kaisha | Developing device having low turbulence developer flow |
| US6317576B1 (en) | 1999-01-22 | 2001-11-13 | Sharp Kabushiki Kaisha | Electrophotographic developing unit |
| KR100719419B1 (en) * | 2000-05-16 | 2007-05-18 | 후지쯔 가부시끼가이샤 | Analog switch circuit |
| KR100729691B1 (en) * | 2000-05-16 | 2007-06-18 | 후지쯔 가부시끼가이샤 | Operational amplifier circuit |
| KR100731226B1 (en) * | 2000-05-16 | 2007-06-22 | 후지쯔 가부시끼가이샤 | Operational amplifier circuit |
| KR100742803B1 (en) * | 2000-05-16 | 2007-07-25 | 후지쯔 가부시끼가이샤 | Operational amplifier circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3109931B2 (en) | 2000-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH11161029A (en) | Developing roller and image forming device | |
| JPH07107618B2 (en) | Development device | |
| JPH0651623A (en) | One-component developing device | |
| JPH06194962A (en) | Developing device | |
| JPS62267782A (en) | Developing device | |
| JPH0744018A (en) | Developing device | |
| JP4731218B2 (en) | Development device | |
| JP3636590B2 (en) | Development device | |
| JP2003330269A (en) | Developing device, process cartridge and image forming apparatus | |
| US20040114970A1 (en) | Magnetic core | |
| JP3270663B2 (en) | Developing device | |
| JP2901197B2 (en) | Developing device | |
| JP2003345136A (en) | Developing device | |
| JP2001290364A (en) | Image forming device | |
| JPH0115065B2 (en) | ||
| JPH10198171A (en) | Developing device | |
| JP3226697B2 (en) | Developing device | |
| JPH034265A (en) | Developing device | |
| JPH0194366A (en) | Developing device | |
| JPH058825B2 (en) | ||
| JP2001027848A (en) | Developing device | |
| JPS617862A (en) | Developing device | |
| JPS6296977A (en) | Developer thin layer forming device | |
| JPS60176071A (en) | Developing device | |
| JPS62234177A (en) | Developing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20000829 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070914 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080914 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090914 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090914 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100914 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100914 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110914 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110914 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120914 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |