JPH08118917A - Pneumatic tire - Google Patents

Pneumatic tire

Info

Publication number
JPH08118917A
JPH08118917A JP6257237A JP25723794A JPH08118917A JP H08118917 A JPH08118917 A JP H08118917A JP 6257237 A JP6257237 A JP 6257237A JP 25723794 A JP25723794 A JP 25723794A JP H08118917 A JPH08118917 A JP H08118917A
Authority
JP
Japan
Prior art keywords
tire
tread
lateral groove
block
peripheral
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
JP6257237A
Other languages
Japanese (ja)
Other versions
JP3554377B2 (en
Inventor
Takeshi Watanabe
剛 渡邊
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.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP25723794A priority Critical patent/JP3554377B2/en
Publication of JPH08118917A publication Critical patent/JPH08118917A/en
Application granted granted Critical
Publication of JP3554377B2 publication Critical patent/JP3554377B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03Tread patterns
    • B60C11/0318Tread patterns irregular patterns with particular pitch sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

PURPOSE: To maintain an antiwet-skid property while reducing pitch noises by setting the peripheral length of a tire having blocks dividing lateral grooves in a tread circumferentially of the tire in a specified relation to the average value of the peripheral length on the tire of the divided lateral groove. CONSTITUTION: Peripheral grooves 2 are disposed in the peripheral direction of a tire on a tire tread 1 to form a rib 11 on the proximity of the equator surface M and tread end of the tire so that lateral grooves 4 are formed between the peripheral grooves 2-1, 2-2 and define blocks 15 while dividing the lateral grooves 4 by blocks 17. The peripheral length D of the block 17 on the tire is set to exceed the average value of the peripheral lengths T1 , T2 of the divided lateral grooves 4-1, 4-2 on the tire and below 2 times thereof. Thus, an antiwet skid property can be maintained while pitch noises can be reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は走行時の騒音を低減した
空気入りタイヤに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire having reduced noise during running.

【0002】[0002]

【従来の技術】近年、自動車に起因する公害問題として
騒音が取り上げられるようになり、また自動車内の居住
性としても、車内の静粛性が重視されるようになってき
た。タイヤが走行中に発生する騒音として、一つに、横
溝を有するトレッドのエッヂと路面との打撃を音源とす
る周波数0〜2kHz の、いわゆるピッチノイズがあり、
車内外の騒音に影響を与えている。このピッチノイズ
は、接地しているトレッドが圧縮変形し、横溝を挟んで
続いて接地するトレッドのエッヂが路面を打撃すること
により発生するものである。したがってこの問題を解決
するためには、端的には、横溝をトレッドから排除すれ
ばよい。
2. Description of the Related Art In recent years, noise has been taken up as a pollution problem caused by automobiles, and the quietness inside the automobile has also been emphasized as the habitability inside the automobile. One of the noises generated while a tire is running is the so-called pitch noise of frequency 0 to 2kHz, which uses the impact of a tread edge with a lateral groove and the road surface as the sound source.
It affects the noise inside and outside the car. This pitch noise is generated when the grounded tread is compressed and deformed, and the edge of the tread that subsequently grounds across the lateral groove strikes the road surface. Therefore, in order to solve this problem, it is simply necessary to eliminate the lateral groove from the tread.

【0003】しかしながら、横溝は自動車の駆動力や制
動力の伝達において、特に耐ウェットスキッド性におい
て重要な役割を果たしており、水膜の排除の点からは横
溝はむしろ広幅であることが好ましいのである。一方、
横溝を広幅にすれば前記したようなトレッドの不連続性
は増大し、ピッチノイズは増大することになってしまう
わけである。
However, the lateral groove plays an important role in transmission of driving force and braking force of an automobile, especially in resistance to wet skid, and it is preferable that the lateral groove is rather wide from the viewpoint of elimination of water film. . on the other hand,
If the width of the lateral groove is increased, the discontinuity of the tread as described above will increase and the pitch noise will increase.

【0004】[0004]

【発明が解決しようとする課題】このように、ピッチノ
イズの抑制と耐ウェットスキッド性とは両立しがたい。
したがって本発明の目的は、耐ウェットスキッド性を維
持しながらピッチノイズを低減することにある。
As described above, it is difficult to achieve both pitch noise suppression and wet skid resistance.
Therefore, it is an object of the present invention to reduce pitch noise while maintaining wet skid resistance.

【0005】[0005]

【課題を解決するための手段】本発明は、円筒状に連な
るトレッドに横溝を有し、該横溝をタイヤ周方向に分割
するブロックを備える空気入りタイヤにおいて、前記ブ
ロックのタイヤ周方向長さが、分割された各横溝のタイ
ヤ周方向長さの平均値以上かつ該平均値の2倍以下であ
ることを特徴とする空気入りタイヤである。
DISCLOSURE OF THE INVENTION The present invention is a pneumatic tire having a lateral groove in a tread which is continuous in a cylindrical shape, and a block which divides the lateral groove in the tire circumferential direction. The pneumatic tire is characterized in that it is not less than an average value and not more than twice the average value of the tire circumferential length of each of the divided lateral grooves.

【0006】尚、ここで横溝とはタイヤ赤道面に対する
角度が45°〜90°であるものとする。また、溝が屈
曲や湾曲をした結果、該溝の一部がタイヤ赤道面に対す
る角度を45°〜90°としている場合には、該当部分
をもって横溝とする。また、横溝を分割するブロック
は、横溝に沿って横溝全体を分割していてもよいが、横
溝を部分的に分割していてもよく、また、該ブロックは
横溝に沿って複数個並んでもよい。ただし、1個乃至複
数個の該ブロックが横溝に沿って90%以上にあたる領
域をタイヤ周方向に分割していることが好ましい。そし
て、前記ブロックはタイヤ周方向に複数個並んでいても
よい。該ブロックがタイヤ周方向に1個であるときは、
分割する横溝のタイヤ周方向長さの中心を含むことが好
ましい。また、前記ブロックはトレッドに配置される多
数本の横溝のうち、全本数を分割してもよいし、また、
そのうちの一部の横溝を分割していてもよい。尚、分割
後の横溝幅の合計が、分割しない場合に予定される横溝
幅と同等として、ネガティブ率を低下させないことが好
ましい。
It is assumed that the lateral groove has an angle of 45 ° to 90 ° with respect to the equatorial plane of the tire. In addition, as a result of the groove being bent or curved, when a part of the groove has an angle of 45 ° to 90 ° with respect to the tire equatorial plane, the corresponding part is defined as a lateral groove. Further, the block dividing the lateral groove may divide the entire lateral groove along the lateral groove, but may also partially divide the lateral groove, and the blocks may be arranged in plural along the lateral groove. . However, it is preferable that one or a plurality of the blocks divide the region corresponding to 90% or more along the lateral groove in the tire circumferential direction. A plurality of the blocks may be arranged in the tire circumferential direction. When the block is one in the tire circumferential direction,
The center of the tire circumferential direction length of the divided lateral groove is preferably included. Further, the block may be divided into a total number of a large number of lateral grooves arranged on the tread,
Some of the lateral grooves may be divided. In addition, it is preferable that the total of the lateral groove widths after the division is equal to the lateral groove width that is expected when the division is not performed and the negative ratio is not reduced.

【0007】[0007]

【作用】トレッドの不連続性は、横溝を分割するブロッ
クによって緩和されるので、ピッチノイズが抑制され
る。前記不連続性を緩和するためには、横溝を分割する
ブロックが所定の剛性を有することが必要となるが、剛
性が過大となると今度は該ブロックによるピッチノイズ
増大の虞がある。したがって、該ブロックのタイヤ周方
向長さを、分割された各横溝のタイヤ周方向長さの平均
値以上かつ該平均値の2倍以下とするのである。また、
同様の理由から、該ブロックが横溝に沿って90%以上
にあたる領域をタイヤ周方向に分割していることが好ま
しいのである。
Since the discontinuity of the tread is mitigated by the block dividing the lateral groove, pitch noise is suppressed. In order to alleviate the discontinuity, it is necessary that the block dividing the lateral groove has a predetermined rigidity. However, if the block becomes excessively rigid, there is a possibility that the pitch noise may increase due to the block. Therefore, the tire circumferential length of the block is equal to or greater than the average value of the divided circumferential grooves in the tire circumferential direction and equal to or less than twice the average value. Also,
For the same reason, it is preferable that the block divides an area corresponding to 90% or more along the lateral groove in the tire circumferential direction.

【0008】[0008]

【実施例】本発明を図面を用いながらさらに説明する。
図1に示されたのは本発明に従う空気入りタイヤのトレ
ッドパターンの展開図である(ただし、タイヤ赤道面 M
を挟んで左右対称であるので右側のみを示している)。
該タイヤのトレッド 1にはタイヤ周方向にストレートに
延びる4本の周溝 2が配置されてタイヤ赤道面 M近傍と
トレッド端部にそれぞれリブ11が形成され、タイヤ赤道
面側の周溝2-1 とトレッド端側の周溝2-2 との間には、
前記周溝に交差する横溝 4がタイヤ赤道面に対する角度
60°で傾斜配置されて、多数のブロック15が形成され
ている。
The present invention will be further described with reference to the drawings.
FIG. 1 is a development view of the tread pattern of the pneumatic tire according to the present invention (however, the tire equatorial plane M
Only the right side is shown because it is symmetrical with sandwiching the).
Four treads 2 extending straight in the tire circumferential direction are arranged on the tread 1 of the tire, and ribs 11 are formed near the tire equatorial plane M and at the tread end, respectively. Between 1 and the peripheral groove 2-2 on the tread end side,
A large number of blocks 15 are formed by arranging lateral grooves 4 intersecting the circumferential groove at an angle of 60 ° with respect to the tire equatorial plane.

【0009】そして本発明では前記横溝 4をタイヤ周方
向に分割するブロック17を備えることが特徴である。図
1の場合、横溝 4が1個のブロック17によって横溝全体
に亘ってタイヤ周方向に2分割されており、該ブロック
のタイヤ周方向長さDが分割された横溝4-1,4-2 のタイ
ヤ周方向長さT1 およびT2 の平均値の1.0倍であ
る。このブロック17によってトレッド 1の不連続性が緩
和されてピッチノイズが抑制されるのである。尚、図1
ではブロック17は横溝 4を等分しており、分割する横溝
のタイヤ周方向長さの中心を含んでいる。
The present invention is characterized by including a block 17 for dividing the lateral groove 4 in the tire circumferential direction. In the case of FIG. 1, the lateral groove 4 is divided into two in the tire circumferential direction over the entire lateral groove by one block 17, and the lateral groove length D of the block is divided into lateral grooves 4-1, 4-2. Is 1.0 times the average value of the tire circumferential lengths T1 and T2. This block 17 alleviates the discontinuity of the tread 1 and suppresses pitch noise. FIG.
In the block 17, the lateral groove 4 is equally divided, and the center of the tire circumferential length of the lateral groove to be divided is included.

【0010】尚、分割後の横溝幅の合計が、分割しない
場合に予定される横溝幅と同等として、ネガティブ率を
低下させないことが好ましいが、この点は後述する比較
試験により明らかにされる。
Incidentally, it is preferable that the total of the lateral groove widths after the division is equal to the lateral groove width expected when the division is not carried out and the negative ratio is not lowered, but this point will be clarified by a comparative test described later.

【0011】[0011]

【発明の効果】図1に示すトレッドを有するサイズ20
5/55R16の空気入りラジアルタイヤを試作した
(以下、実施例1とする)。この比較として、図2に示
すトレッドを有する従来タイヤ1も試作した。図2のト
レッドは図1の場合と同様に、タイヤ周方向にストレー
トに延びる4本の周溝 2が配置されてタイヤ赤道面 M近
傍とトレッド端部にそれぞれリブ11が形成され、タイヤ
赤道面側の周溝2-1 とトレッド端側の周溝2-2 との間に
は、前記周溝に交差する横溝 4がタイヤ赤道面に対する
角度60°で傾斜配置されて、多数のブロック15が形成
されている。しかしながら、横溝をタイヤ周方向に分割
するブロック17は配置されていない。ここで、横溝 4の
溝幅は、図1の場合における横溝4-1,4-2 の溝幅の合計
と同等とされており、ネガティブ率が両者同等とされて
いる。
The size 20 having the tread shown in FIG.
A 5 / 55R16 pneumatic radial tire was prototyped (hereinafter referred to as Example 1). For this comparison, a conventional tire 1 having a tread shown in FIG. 2 was also prototyped. As in the case of FIG. 1, the tread of FIG. 2 has four circumferential grooves 2 extending straight in the tire circumferential direction, and ribs 11 are formed near the tire equatorial plane M and at the tread end, respectively. Between the peripheral groove 2-1 on the side and the peripheral groove 2-2 on the tread end side, a lateral groove 4 intersecting with the peripheral groove is arranged at an angle of 60 ° with respect to the tire equatorial plane, and a large number of blocks 15 are formed. Has been formed. However, the block 17 that divides the lateral groove in the tire circumferential direction is not arranged. Here, the groove width of the lateral groove 4 is equal to the sum of the groove widths of the lateral grooves 4-1 and 4-2 in the case of FIG. 1, and the negative ratios are equal to each other.

【0012】(車外騒音試験)この試験は、タイヤに内
圧2.0kgf/cm2 を充填し、荷重400kgf を負荷して
台上騒音試験用ドラムにより、速度4水準(40km/h、
50km/h、60km/h、80km/h)にて音圧を測定し、そ
の平均値によって比較した。この結果、実施例1のタイ
ヤは従来例1のタイヤに対して−2.0dBであって、
ピッチノイズ低減に関する本発明の効果が明らかとなっ
た。
(External noise test) In this test, tires were filled with an internal pressure of 2.0 kgf / cm 2 , a load of 400 kgf was applied, and a drum for a noise test on a table was used to measure a speed of 4 levels (40 km / h,
Sound pressure was measured at 50 km / h, 60 km / h, 80 km / h), and the average value was compared. As a result, the tire of Example 1 was -2.0 dB compared with the tire of Conventional Example 1,
The effect of the present invention on pitch noise reduction has been clarified.

【0013】(ハイドロプレーニング試験)この試験
は、タイヤに内圧2.0kgf/cm2 を充填した後、実車に
装着し、水深10mmの溜水路を直進走行させてハイドロ
プレーニング現象が発生する最低速度を測定することに
よって行った。この結果、実施例1のタイヤと従来例1
のタイヤとは前記発生速度が同等であって、ネガティブ
率を低下させなければ耐ウェットスキッド性を維持する
ことができることが明らかとなった。
(Hydroplaning test) In this test, after the tire was filled with an internal pressure of 2.0 kgf / cm 2 , the tire was mounted on an actual vehicle and the minimum speed at which the hydroplaning phenomenon occurred was caused by running straight in a reservoir with a water depth of 10 mm. It was done by measuring. As a result, the tire of Example 1 and the conventional example 1
It was found that the above-mentioned generation speed is the same as that of the tire of No. 1, and wet skid resistance can be maintained unless the negative ratio is reduced.

【0014】さらに本発明の効果を確認するべく、図3
に示されたようなトレッドを有する実施例2のタイヤも
試作した。図3の場合、トレッドにはやはり4本の周溝
2が配置されるものの、トレッド端側の周溝2-2 のタイ
ヤ幅方向内側には3本のリブ11が形成され、該周溝2-2
のタイヤ幅方向外側にはタイヤ赤道面に対する角度が9
0°の横溝 4が配置されて多数のブロック15が形成され
ている。そして、横溝4が1個のブロック17によって横
溝全体に亘ってタイヤ周方向に2分割されており、該ブ
ロックのタイヤ周方向長さが分割された横溝4-1,4-2 の
タイヤ周方向長さの平均値の1.0倍である。尚、図3
ではブロック17は横溝 4を等分しており、分割する横溝
の幅中心を含んでいる。
Further, in order to confirm the effect of the present invention, FIG.
A tire of Example 2 having a tread as shown in Fig. 3 was also manufactured. In the case of FIG. 3, there are also four circumferential grooves on the tread.
Although two are arranged, three ribs 11 are formed inside the circumferential groove 2-2 on the tread end side in the tire width direction.
On the outside in the tire width direction, the angle with respect to the tire equatorial plane is 9
A large number of blocks 15 are formed by arranging the 0 ° lateral grooves 4. Further, the lateral groove 4 is divided into two in the tire circumferential direction over the entire lateral groove by one block 17, and the tire circumferential direction of the lateral grooves 4-1, 4-2 in which the tire circumferential direction length of the block is divided. It is 1.0 times the average value of the length. FIG.
In the block 17, the lateral groove 4 is equally divided, and the width center of the lateral groove to be divided is included.

【0015】図4に示したのは、図3の実施例2の比較
として試作した従来例2のタイヤである。従来例2のタ
イヤも、実施例1のタイヤと従来例1のタイヤの関係と
同様に、実施例2のタイヤにあるブロック17が配置され
ず、また、ネガティブ率が同等となるよう溝幅 4が設定
されている。
Shown in FIG. 4 is a tire of Conventional Example 2 which was experimentally produced as a comparison with Example 2 of FIG. Similar to the relationship between the tire of Example 1 and the tire of Conventional Example 1, the tire of Conventional Example 2 does not include the block 17 in the tire of Example 2, and the groove width 4 is set so that the negative ratio becomes equal. Is set.

【0016】実施例2と従来例2のタイヤについても、
前記の車外騒音試験とハイドロプレーニング試験を行っ
た結果、車外騒音試験については実施例2のタイヤは従
来例2のタイヤ対比で−2.5dBであり、ハイドロプ
レーニング試験については両者同等であり、ここでも本
発明の効果が確認された。
Also for the tires of Example 2 and Conventional Example 2,
As a result of performing the vehicle exterior noise test and the hydroplaning test, the tire of Example 2 was -2.5 dB in comparison with the tire of Conventional Example 2 in the vehicle exterior noise test, and both of them were the same in the hydroplaning test. However, the effect of the present invention was confirmed.

【0017】すなわち本発明によれば、耐ウェットスキ
ッド性を維持しながらピッチノイズを低減することがで
きるのである。
That is, according to the present invention, pitch noise can be reduced while maintaining wet skid resistance.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に従う空気入りタイヤのトレッドパター
ンの展開図である。タイヤ赤道面 Mの右側のみを示して
いる。
FIG. 1 is a development view of a tread pattern of a pneumatic tire according to the present invention. Only the right side of the tire equatorial plane M is shown.

【図2】従来の空気入りタイヤのトレッドパターン展開
図である。タイヤ赤道面 Mの右側のみを示している。
FIG. 2 is a development view of a tread pattern of a conventional pneumatic tire. Only the right side of the tire equatorial plane M is shown.

【図3】本発明に従う他の空気入りタイヤのトレッドパ
ターンの展開図である。タイヤ赤道面 Mの右側のみを示
している。
FIG. 3 is a development view of a tread pattern of another pneumatic tire according to the present invention. Only the right side of the tire equatorial plane M is shown.

【図4】従来の空気入りタイヤのトレッドパターン展開
図である。タイヤ赤道面 Mの右側のみを示している。
FIG. 4 is a development view of a tread pattern of a conventional pneumatic tire. Only the right side of the tire equatorial plane M is shown.

【符号の説明】[Explanation of symbols]

1 トレッド 2 周溝 4 横溝 11 リブ 15 ブロック 17 ブロック 1 tread 2 circumferential groove 4 lateral groove 11 rib 15 block 17 block

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 円筒状に連なるトレッドに横溝を有し、
該横溝をタイヤ周方向に分割するブロックを備える空気
入りタイヤにおいて、前記ブロックのタイヤ周方向長さ
が、分割された各横溝のタイヤ周方向長さの平均値以上
かつ該平均値の2倍以下であることを特徴とする空気入
りタイヤ。
1. A tread that is continuous in a cylindrical shape has a lateral groove,
In a pneumatic tire including a block that divides the lateral groove in a tire circumferential direction, a tire circumferential direction length of the block is equal to or greater than an average value of tire circumferential lengths of each of the divided lateral grooves and is equal to or less than twice the average value. A pneumatic tire characterized by being
JP25723794A 1994-10-24 1994-10-24 Pneumatic tire Expired - Fee Related JP3554377B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25723794A JP3554377B2 (en) 1994-10-24 1994-10-24 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25723794A JP3554377B2 (en) 1994-10-24 1994-10-24 Pneumatic tire

Publications (2)

Publication Number Publication Date
JPH08118917A true JPH08118917A (en) 1996-05-14
JP3554377B2 JP3554377B2 (en) 2004-08-18

Family

ID=17303597

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25723794A Expired - Fee Related JP3554377B2 (en) 1994-10-24 1994-10-24 Pneumatic tire

Country Status (1)

Country Link
JP (1) JP3554377B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010032736A1 (en) 2008-09-18 2010-03-25 株式会社ブリヂストン Method of designing tire and tire
WO2010032737A1 (en) 2008-09-18 2010-03-25 株式会社ブリヂストン Method of designing tire and tire
WO2010061631A1 (en) 2008-11-27 2010-06-03 株式会社ブリヂストン Tire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010032736A1 (en) 2008-09-18 2010-03-25 株式会社ブリヂストン Method of designing tire and tire
WO2010032737A1 (en) 2008-09-18 2010-03-25 株式会社ブリヂストン Method of designing tire and tire
WO2010061631A1 (en) 2008-11-27 2010-06-03 株式会社ブリヂストン Tire
US9073391B2 (en) 2008-11-27 2015-07-07 Bridgestone Corporation Tire

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