JP3444696B2 - Brake piston - Google Patents
Brake pistonInfo
- Publication number
- JP3444696B2 JP3444696B2 JP12543095A JP12543095A JP3444696B2 JP 3444696 B2 JP3444696 B2 JP 3444696B2 JP 12543095 A JP12543095 A JP 12543095A JP 12543095 A JP12543095 A JP 12543095A JP 3444696 B2 JP3444696 B2 JP 3444696B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- phenol resin
- glass fiber
- brake piston
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
- F16D2125/06—Pistons
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、フェノール樹脂からな
る耐摩耗性、耐ブレーキ液性及び耐熱性に優れたディス
クブレーキ用ブレーキピストンに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake piston for a disc brake, which is made of a phenolic resin and has excellent wear resistance, brake fluid resistance and heat resistance.
【０００２】[0002]
【従来の技術】従来、ディスクブレーキ用ブレーキピス
トンはその使用環境から耐熱性、耐摩耗性、耐ブレーキ
液性、機械的強度等が要求される。これらの特性を満た
すため、セラミックや金属製のブレーキピストンが用い
られていた。また、かかる特性からプラスチック材料で
はフェノール樹脂が用いられている。セラミックや金属
製のブレーキピストンは、重量が重い、加工に時間がか
かる、コストが高い等の問題がある。これに対し、フェ
ノール樹脂では耐熱性、機械的強度も良く成形品も比較
的安易に得られることからそのメリットは非常に高い。
しかし、このような特性を付与するため、従来は充填材
としてガラス繊維やシリカ等を配合していた。これらの
充填材では、機械的強度、耐熱性は向上するもののコス
トが高くなる上に、耐摩耗性が低下する。2. Description of the Related Art Conventionally, brake pistons for disc brakes are required to have heat resistance, wear resistance, brake fluid resistance, mechanical strength, etc., depending on the environment in which they are used. In order to satisfy these characteristics, a brake piston made of ceramic or metal has been used. Further, from such characteristics, a phenol resin is used as the plastic material. Brake pistons made of ceramic or metal have problems such as heavy weight, long processing time, and high cost. On the other hand, the phenol resin has excellent heat resistance and mechanical strength, and molded articles can be obtained relatively easily, and therefore its merit is very high.
However, in order to impart such characteristics, glass fibers, silica and the like have conventionally been blended as a filler. these
With the filler, although the mechanical strength and the heat resistance are improved, the cost is increased and the wear resistance is decreased .
【０００３】[0003]
【発明が解決しようとする課題】本発明は、従来のディ
スクブレーキ用ブレーキピストンとして使用されていた
セラミックや金属に代わり、機械的強度を損なうことな
く、耐摩耗性、耐ブレーキ液性に優れ、且つ従来のフェ
ノール樹脂製ブレーキピストンに比べ耐熱劣化性に優れ
た、フェノール樹脂からなるブレーキピストンを提供す
るものである。DISCLOSURE OF THE INVENTION The present invention replaces ceramics and metals used as conventional brake pistons for disc brakes with excellent wear resistance and brake fluid resistance without impairing mechanical strength, In addition, the present invention provides a brake piston made of a phenol resin, which is superior in heat deterioration resistance to the conventional phenol resin brake piston.
【０００４】[0004]
【課題を解決するための手段】本発明は、フェノール樹
脂、及び充填材として硅灰石及びガラス繊維を含有し、
フェノール１００重量部に対して、ガラス繊維８０〜１
２０重量部及び硅灰石２００〜３５０重量部を含有した
フェノール樹脂組成物を成形してなることを特徴とする
ブレーキピストン、及びフェノール樹脂、及び充填材と
して硅灰石及びガラス繊維を含有し、且つ部分架橋アク
リロニトリルブタジエンラバーを含有し、フェノール１
００重量部に対して、ガラス繊維８０〜１２０重量部、
硅灰石２００〜３５０重量部及び部分架橋ＮＢＲ５〜２
０重量部を含有したフェノール樹脂組成物を成形してな
ることを特徴とするブレーキピストンに関するものであ
る。 The present invention provides a phenolic tree.
Contains fat and silica stone and glass fiber as a filler,
80-1 glass fiber to 100 parts by weight of phenol
20 parts by weight and 200-350 parts by weight of silica stone
Characterized by molding a phenol resin composition
With brake piston, phenolic resin, and filler
Containing silica stone and glass fiber, and partially crosslinked
Contains Lilonitrile Butadiene Rubber, Phenol 1
80 to 120 parts by weight of glass fiber with respect to 00 parts by weight,
Silica stone 200-350 parts by weight and partially cross-linked NBR5-2
By molding a phenol resin composition containing 0 parts by weight
Relating to a brake piston characterized by
It
【０００５】フェノール樹脂はノボラック型フェノール
樹脂またはレゾール型フェノール樹脂のいずれを使用し
てもよい。レゾール型フェノール樹脂としてはジメチレ
ンエーテル型またはメチロール型のいずれを用いてもよ
い。また、ノボラック型フェノール樹脂を用いた場合、
硬化剤としてヘキサメチレンテトラミンまたは上記記載
のレゾール型フェノール樹脂を併用する。As the phenol resin, either a novolac type phenol resin or a resol type phenol resin may be used. As the resol type phenol resin, either a dimethylene ether type or a methylol type may be used. When using novolac type phenolic resin,
Hexamethylenetetramine or the above-mentioned resol type phenol resin is used in combination as a curing agent.
【０００６】硅灰石は粒径１０μｍ〜３００μｍが好ま
しい。１０μｍ未満では組成物を成形材料化の際、作業
性が悪くなり、また３００μｍを越えると成形時に配向
が生じ機械的強度に異方性がでることと、寸法精度も低
下するため好ましくない。硅灰石はフェノール樹脂１０
０重量部に対し、２００〜３５０重量部配合する。２０
０重量部未満では耐摩耗性、寸法精度が低下するうえ、
耐ブレーキ液性も低下する。３５０重量部を越えると成
形材料化の際、作業性が悪くなることと、成形時の流動
性が悪くなり成形が困難になるため好ましくない。The silica stone preferably has a particle size of 10 μm to 300 μm. When it is less than 10 μm, workability is deteriorated when the composition is made into a molding material, and when it exceeds 300 μm, orientation occurs during molding, resulting in anisotropy in mechanical strength and dimensional accuracy, which is not preferable. Silica stone is phenolic resin 10
200 to 350 parts by weight are mixed with 0 parts by weight. 20
If the amount is less than 0 parts by weight, wear resistance and dimensional accuracy will deteriorate, and
The brake fluid resistance is also reduced. If the amount exceeds 350 parts by weight, workability is deteriorated when forming a molding material, and fluidity during molding is deteriorated, which makes molding difficult, which is not preferable.
【０００７】また、機械的強度を維持・向上するためガ
ラス繊維を配合する。ガラス繊維の配合量はフェノール
樹脂１００重量部に対し８０〜１２０重量部である。８
０重量部未満では機械的強度が不十分となり、１２０重
量部を越えるとガラス繊維の配向により機械的強度の異
方性が生じたり、耐摩耗性が低下する、寸法精度が悪く
なるといった問題が生じるため好ましくない。更にその
繊維長は５００μｍ〜５ｍｍが好ましい。５００μｍ未
満では、ガラス繊維の特徴である高強度化の効果が小さ
くなるため好ましくない。５ｍｍを越えると、材料の生
産性が悪くなったり、成形品中での配向が強くなり機械
的強度に異方性が生じたり寸法精度が悪くなるため好ま
しくない。Further, glass fibers are blended in order to maintain and improve the mechanical strength. The glass fiber content is 80 to 120 parts by weight with respect to 100 parts by weight of the phenol resin . 8
If it is less than 0 parts by weight, the mechanical strength becomes insufficient, and if it exceeds 120 parts by weight, the anisotropy of the mechanical strength is caused by the orientation of the glass fibers, the abrasion resistance is lowered, and the dimensional accuracy is deteriorated. It is not preferable because it occurs. Furthermore, the fiber length is preferably 500 μm to 5 mm. When it is less than 500 μm, the effect of increasing the strength, which is a characteristic of glass fiber, becomes small, which is not preferable. If it exceeds 5 mm, the productivity of the material is deteriorated, the orientation in the molded product is increased, the mechanical strength becomes anisotropic, and the dimensional accuracy is deteriorated, which is not preferable.
【０００８】更に、耐熱性をより向上させるためには部
分架橋ＮＢＲを配合する。部分架橋ＮＢＲは、モノマー
の段階でブタジエンの二重結合とアクリルを架橋させた
ものを適当な割合で重合させたものであればよく、ノー
マルなアクリロニトリルブタジエンに対する架橋部分の
比率は特に限定しないが、架橋の比率が高いと樹脂との
相溶性が悪くなるため、０．１〜１％の比率で架橋して
いるものが好ましい。また、アクリロニトリルとブタジ
エンの混合比率はフェノール樹脂との相溶性を考えてＳ
Ｐ値９〜１０程度に調整されていればよい。このような
部分架橋ＮＢＲをフェノール樹脂１００重量部に対し５
〜２０重量部配合する。５重量部未満では耐熱性の向上
が十分ではなく、２０重量部を越えると熱剛性が低下す
るとともに耐ブレーキ液性が低下するようになる。Furthermore, in order to improve the heat resistance blending a partially crosslinked NBR. The partially cross-linked NBR may be any one obtained by polymerizing a double bond of butadiene and acrylic cross-linked in a monomer stage at an appropriate ratio, and the ratio of the cross-linked part to normal acrylonitrile butadiene is not particularly limited. If the cross-linking ratio is high, the compatibility with the resin becomes poor. Therefore, the cross-linking ratio of 0.1 to 1% is preferable. Also, the mixing ratio of acrylonitrile and butadiene should be S in consideration of compatibility with phenol resin.
The P value may be adjusted to about 9 to 10. Such partially crosslinked NBR is added to 5 parts by weight of 100 parts by weight of the phenol resin.
˜20 parts by weight . If it is less than 5 parts by weight, the heat resistance is not sufficiently improved, and if it exceeds 20 parts by weight, the thermal rigidity is lowered and the brake fluid resistance is lowered.
【０００９】このような、フェノール樹脂と充填材、又
はフェノール樹脂と部分架橋ＮＢＲと充填材からなる原
材料に、滑剤、着色剤、硬化触媒等を加え、加熱混練す
ることによりブレーキピストン用の成形材料を得る。更
にこのような方法により得られた成形材料を射出成形、
移送成形、圧縮成形等により成形しディスクブレーキ用
ブレーキピストンを得る。A molding material for a brake piston by adding a lubricant, a coloring agent, a curing catalyst, etc. to the raw material composed of the phenol resin and the filler, or the phenol resin and the partially crosslinked NBR and the filler, and kneading the mixture by heating. To get Furthermore, injection molding the molding material obtained by such a method,
A brake piston for a disc brake is obtained by molding by transfer molding or compression molding.
【００１０】[0010]
【作用】本発明においては、用いられる硅灰石は針状結
晶であることからガラス繊維と同様な効果により他の無
機充填材を多量に含有した場合に比べ、機械的強度に優
れた特性を得ることが出来るばかりでなく、ガラス繊維
やシリカに比べ耐摩耗性に優れている。このため硅灰石
を多量に配合しても機械的強度の低下、及び耐摩耗性を
損なうことはない。また、耐摩耗性に影響を与えない範
囲でガラス繊維を配合することで、機械的強度をより向
上させている。更に部分架橋ＮＢＲを配合することによ
り熱時の応力集中を分散させ、微小クラックの進行を防
ぎ、熱時劣化を抑え、耐熱性を向上させている。このよ
うな配合により機械的強度、耐摩耗性、耐ブレーキ液性
に優れたフェノール樹脂製のディスクブレーキ用ブレー
キピストンを得ることが出来る。In the present invention, since the apatite used is acicular crystals, it has excellent mechanical strength as compared with the case where a large amount of other inorganic filler is contained by the same effect as glass fiber. Not only can it be obtained, but it is also superior in abrasion resistance compared to glass fiber and silica. Therefore, even if a large amount of silica stone is mixed, the mechanical strength is not lowered and the wear resistance is not impaired. Further, the mechanical strength is further improved by blending the glass fiber in a range that does not affect the wear resistance. Further, by blending partially cross-linked NBR, stress concentration during heating is dispersed, progress of microcracks is prevented, deterioration during heating is suppressed, and heat resistance is improved. With such a composition, it is possible to obtain a brake piston for a disc brake, which is made of a phenol resin and has excellent mechanical strength, wear resistance, and brake fluid resistance.
【００１１】[0011]
【実施例】次に本発明を実施例及び比較例に基づいて説
明する。ここで「部」は「重量部」を示す。表１に示す
材料及び配合にて、加熱ロールにより混練してフェノー
ル樹脂成形材料を得た。EXAMPLES Next, the present invention will be explained based on Examples and Comparative Examples. Here, "part" means "part by weight". The materials and formulations shown in Table 1 were kneaded with a heating roll to obtain a phenol resin molding material.
【００１２】[0012]
【表１】 （注）ノボラック樹脂 数平均分量９００ レゾール樹脂 数平均分量６００ 部分架橋ＮＢＲ 日本合成ゴム製ＰＮＣ−３８ （部分架橋の割合０．８モル％、ＳＰ値９．７） 硅灰石 平均粒径５０μｍ ガラス繊維 長さ２ｍｍ、径５μｍ シリカ 平均粒径３μｍ[Table 1] (Note) Novolak resin Number average quantity 900 Resol resin Number average quantity 600 Partially crosslinked NBR Nippon Synthetic Rubber PNC-38 (Partial crosslink ratio 0.8 mol%, SP value 9.7) Silica stone Average particle size 50 μm Glass Fiber length 2 mm, diameter 5 μm, silica average particle diameter 3 μm
【００１３】実施例１〜３は部分架橋ＮＢＲを含まない
組成であり、実施例４〜６は部分架橋ＮＢＲを含む組成
である。実施例１及び４はフェノール樹脂としてノボラ
ック型を用い従来の充填材であるシリカを硅灰石に置き
換えたものである。実施例２及び５はフェノール樹脂と
してレゾール型を用いた場合である。実施例３及び６は
フェノール樹脂としてノボラック型とレゾール型を併用
した場合である。比較例１及び比較例２は充填材として
シリカを用いている。フェノール樹脂として比較例１は
ノボラックを、比較例２はレゾールを用いている。比較
例３及び４は充填材としてガラス繊維、硅灰石をそれぞ
れ単独で使用した場合である。各実施例及び比較例で得
られた成形材料について、強度試験、耐ブレーキ液性、
耐熱性、摩耗試験等の確認を行った。その結果を表２に
示す。Examples 1 to 3 are compositions containing no partially crosslinked NBR, and Examples 4 to 6 are compositions containing partially crosslinked NBR. In Examples 1 and 4, a novolac type was used as the phenol resin and silica, which is a conventional filler, was replaced with silica stone. Examples 2 and 5 are cases in which a resol type was used as the phenol resin. Examples 3 and 6 are cases where the novolac type and the resol type are used together as the phenol resin. In Comparative Example 1 and Comparative Example 2, silica is used as the filler. As the phenolic resin, novolac is used in Comparative Example 1 and resol is used in Comparative Example 2. Comparative Examples 3 and 4 are the cases where glass fiber and silica stone were used alone as the fillers. For the molding materials obtained in each Example and Comparative Example, strength test, brake fluid resistance,
The heat resistance and abrasion test were confirmed. The results are shown in Table 2.
【００１４】[0014]
【表２】 [Table 2]
【００１５】〔測定方法〕
（１）曲げ強さ：ＪＩＳ Ｋ ７２０３による。
（２）耐ブレーキ液性：ブレーキ液中で２００℃で５０
０時間処理後の曲げ強さ保持率、寸法変化率、重量変化
率を測定。
（３）耐熱性：雰囲気２５０℃で５００時間で処理後の
曲げ強さ保持率、寸法変化率、重量変化率を測定した。
（４）耐摩耗性：滑り摩耗試験による（相手材；鉄Ｓ５
５Ｃ）[Measuring Method] (1) Bending Strength: According to JIS K7203. (2) Brake fluid resistance: 50 at 200 ° C in brake fluid
Bending strength retention rate, dimensional change rate, and weight change rate after 0 hour treatment were measured. (3) Heat resistance: The bending strength retention rate, the dimensional change rate, and the weight change rate were measured after treatment at 250 ° C. for 500 hours. (4) Wear resistance: According to a sliding wear test (counterpart material: iron S5
5C)
【００１６】[0016]
【発明の効果】本発明のブレーキピストンは硅灰石及び
ガラス繊維を含有し、且つ部分架橋ＮＢＲを含有したフ
ェノール樹脂組成物からなるので、機械的強度、耐摩耗
性及び耐ブレーキ液性に優れ、且つ耐熱性に優れた軽量
なブレーキピストンを提供することができる。Since the brake piston of the present invention comprises a phenolic resin composition containing silica stone and glass fiber and partially cross-linked NBR, it is excellent in mechanical strength, wear resistance and brake fluid resistance. It is also possible to provide a lightweight brake piston having excellent heat resistance.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−79070（ＪＰ，Ａ) 特開 平４−1259（ＪＰ，Ａ) 特開 平５−32862（ＪＰ，Ａ) 特開 平６−107902（ＪＰ，Ａ) 特開 平６−128459（ＪＰ，Ａ) 特開 昭61−48623（ＪＰ，Ａ) 特開 昭62−137435（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continued front page (56) References Japanese Patent Laid-Open No. 61-79070 (JP, A) Japanese Patent Laid-Open No. 4-1259 (JP, A) Japanese Patent Laid-Open No. 5-32862 (JP, A) JP-A-6-107902 (JP, A) JP-A-6-128459 (JP, A) JP 61-48623 (JP, A) JP 62-137435 (JP, A)
Claims (2)
石及びガラス繊維を含有し、フェノール１００重量部に
対して、ガラス繊維８０〜１２０重量部及び硅灰石２０
０〜３５０重量部を含有したフェノール樹脂組成物を成
形してなることを特徴とするブレーキピストン。1. A phenol resin and silica wollastonite and glass fiber as a filler are contained in 100 parts by weight of phenol.
On the other hand, 80 to 120 parts by weight of glass fiber and silica stone 20
A brake piston formed by molding a phenol resin composition containing 0 to 350 parts by weight .
石及びガラス繊維を含有し、且つ部分架橋アクリロニト
リルブタジエンラバーを含有し、フェノール１００重量
部に対して、ガラス繊維８０〜１２０重量部、硅灰石２
００〜３５０重量部及び部分架橋ＮＢＲ５〜２０重量部
を含有したフェノール樹脂組成物を成形してなることを
特徴とするブレーキピストン。2. A phenolic resin and silica ash as a filler.
Partially cross-linked acrylonite containing stone and glass fiber
Containing Ryl butadiene rubber, 100 weight of phenol
80 to 120 parts by weight of glass fiber, silica stone 2
0 to 350 parts by weight and partially crosslinked NBR 5 to 20 parts by weight
To form a phenol resin composition containing
The characteristic brake piston .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12543095A JP3444696B2 (en) | 1994-11-16 | 1995-05-24 | Brake piston |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28231894 | 1994-11-16 | ||
| JP6-282318 | 1994-11-16 | ||
| JP12543095A JP3444696B2 (en) | 1994-11-16 | 1995-05-24 | Brake piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08193632A JPH08193632A (en) | 1996-07-30 |
| JP3444696B2 true JP3444696B2 (en) | 2003-09-08 |
Family
ID=26461871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12543095A Expired - Lifetime JP3444696B2 (en) | 1994-11-16 | 1995-05-24 | Brake piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3444696B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4120517B2 (en) * | 2003-07-24 | 2008-07-16 | 株式会社豊田自動織機 | Wood resin for molding on-vehicle components, its manufacturing method, wood resin material for molding on-vehicle components, and on-vehicle components molded therefrom |
| JP5504786B2 (en) * | 2009-09-24 | 2014-05-28 | 住友ベークライト株式会社 | Phenolic resin molding material |
-
1995
- 1995-05-24 JP JP12543095A patent/JP3444696B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08193632A (en) | 1996-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0576514B2 (en) | ||
| JP2003313398A (en) | Phenolic resin molding material and brake piston obtained by using the same | |
| JP3444696B2 (en) | Brake piston | |
| JP2002201335A (en) | Phenol resin molding material | |
| JP3034886B2 (en) | Phenolic resin composition with excellent impact strength | |
| JP3121754B2 (en) | Phenolic resin molding material | |
| JPH11148071A (en) | Composition for friction material | |
| JP3121751B2 (en) | Phenolic resin molding material | |
| JP2005048009A (en) | Phenolic resin molding compound | |
| JP3032136B2 (en) | Brake piston | |
| JP2002265752A (en) | Phenolic resin molding material | |
| JPH0512396B2 (en) | ||
| JP2653574B2 (en) | Phenolic resin composition with excellent impact strength | |
| JPH08109937A (en) | Heat resistant braking material and its manufacture | |
| JPH08159244A (en) | Resin pulley | |
| JP3437031B2 (en) | Phenolic resin molding materials | |
| JP2000026706A (en) | Phenolic resin molding material | |
| JP3526087B2 (en) | Phenolic resin molding material | |
| JPH08145148A (en) | Resin made pulley | |
| JP3938477B2 (en) | Phenolic resin molding material | |
| JPH09286901A (en) | Phenol resin gear | |
| JP3375110B2 (en) | Phenolic resin molding materials | |
| JP2003035330A (en) | Brake piston | |
| JP3121686B2 (en) | Phenolic resin molding material | |
| JP2872797B2 (en) | Friction material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090627 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090627 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100627 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110627 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120627 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130627 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130627 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140627 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term |