JPH0443805B2 - - Google Patents
Info
- Publication number
- JPH0443805B2 JPH0443805B2 JP59133259A JP13325984A JPH0443805B2 JP H0443805 B2 JPH0443805 B2 JP H0443805B2 JP 59133259 A JP59133259 A JP 59133259A JP 13325984 A JP13325984 A JP 13325984A JP H0443805 B2 JPH0443805 B2 JP H0443805B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- cords
- polyamide fiber
- cord
- aromatic polyamide
- 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
- 239000000835 fiber Substances 0.000 claims description 30
- 239000004760 aramid Substances 0.000 claims description 24
- 229920003235 aromatic polyamide Polymers 0.000 claims description 24
- 230000003014 reinforcing effect Effects 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000011324 bead Substances 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 229920001778 nylon Polymers 0.000 description 7
- 239000004677 Nylon Substances 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
- B60C9/2009—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords comprising plies of different materials
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Description
〔発明の技術分野〕
本発明は、ベルト補強層の最外層の外側に積層
されたベルトカバー層の補強コードを構成する芳
香族ポリアミド繊維コードを改良することによ
り、上記ベルトカバー層のスプライス部に発生す
る剥離故障（セパレーシヨン）を防止して、タイ
ヤ耐久性を大幅に改善した空気入りラジアルタイ
ヤに関するものである。
〔従来技術〕
近年、高速道路網の発達や乗用車の高性能化等
に相まつて、タイヤに対する要求性能の高度化、
多技化は留まるところをしらない。
例えば、SRタイヤよりも更に高速走行可能な
HRタイヤ化、これよりも更にもつと高速走行可
能なVRタイヤとか、より繰縦安定性に優れた偏
平タイヤへの要求等があげられる。
そこで、高速走行時に遠心力によるタイヤ半径
方向外側へのせり上がりを防止するために、スチ
ールコードを補強コードとしかつプライ間でコー
ドが互いに交差した二層のベルト補強層の最外層
の外側に、ナイロンコードからなる補強コードを
タイヤ周方向に対してほぼ0゜（平行に配置したベ
ルトカバー層を積層配置することが試みられ、あ
る程度の効果を挙げている。しかしながら、ナイ
ロンコードは、そのモジユラスが低い関係上、こ
の場合、繰縦安定性の向上は望めなかつた。
このため、最近、ベルトカバー層の補強コード
としてナイロンコードよりもモジユラスが大幅に
高い芳香族ポリアミド繊維コードを用いることが
研究され提案されるようになつた。
このようにベルトカバー層の補強コードとして
芳香族ポリアミド繊維コードを用いると、確か
に、ナイロンコードを補強コードとしたベルトカ
バー層を積層配置した空気入りラジアルタイヤと
比較して、繰縦安定性は大幅に改善される。しか
し、芳香族ポリアミド繊維コードは、その分子構
造上、コードゴムとの接着性が劣る。したがつ
て、ベルトカバー層のスプライス部において、ベ
ルトカバー層を構成する芳香族ポルアミド繊維コ
ードとコードゴムとが剥離する、いわゆる剥離故
障（セパレーシヨン）が発生し、タイヤ耐久性を
低下せしめるという問題があつた。
〔発明の目的〕
本発明は、ベルトカバー層に芳香族ポリアミド
繊維コード層を用いた場合において、そのスプラ
イス部におけるセパレーシヨンの発生を防止して
タイヤ耐久性を向上させた空気入りラジアルタイ
ヤを提供することを目的とする。
〔発明の構成〕
このため本発明は、左右一対のビード部と、該
ビード部に連らなる左右一対のサイドウオール部
と、該一対のサイドウオール部間に位置するトレ
ツドからなり、該左右一対のビード部間にカーカ
ス層が装架され、トレツドとカーカス層と間に、
プライ間でコードが互いに交差した少なくとも２
層のスチールコード層からなるベルト補強層が配
置され、該ベルト補強層の外側に、コードがタイ
ヤ周方向とほぼ平行に配置された芳香族ポリアミ
ド繊維コード層からなるベルトカバー層が設けら
れた空気入りラジアルタイヤにおいて、前記芳香
族ポリアミド繊維コード層が、直径0.55〜0.65mm
の芳香族ポリアミド繊維コードを100％モジユラ
スが30Kg／cm2〜70Kg／cm2の被覆ゴム中のコードに
直角方向５cm当り40本〜70本埋め込んで構成され
たことを特徴とする。
このように本発明では、方向族ポリアミド繊維
コード層のコード径、エンド数（コードに直角方
向５cm当りのコード使用本数）、およびコードゴ
ム（被覆ゴム）の10％モジユラスを特定したため
に、芳香族ポリアミド繊維コードとコードゴムと
のなじみが良くなるので、芳香族ポリアミド繊維
コード層からなるベルトカバー層のスプライス部
でのセパレーシヨンの発生を防止することが可能
となる。
以下、図を参照して本発明の構成につき詳しく
説明する。
第１は、本発明の空気入りラジアルタイヤの一
例の判断面斜視図である。
第１図において、１はトレツド、２は左右一対
のビード部４，４間に装架されたカーカス層であ
り、トレツド１においてはこのカーカス層２の外
周を取り囲むようにスチールコードからなる下側
ベルト補強層３ｄおよび上側ベルト補強層３ｕと
その外周面に芳香族ポリアミド繊維コードからな
るベルトカバー層５とが配置されている、下側ベ
ルト補強層３ｄのコードと上側ベルト補強側３ｕ
のコードとは互いに交差している。タガ効果を発
揮させるためである。また、ベルトカバー層５の
コードはタイヤ周方向とほぼ平行である。高速走
行時の遠心力によるタイヤせり上がりを防止する
ためである。５ｓはベルトカバー層５のスプライ
ス部である。６，６へ左右一対のビード部４，４
に連結する左右一対のサイドウオール部である。
カーカス層２は、ビード部４でビード廻りに折り
返されている。EE′は、タイヤ周方向を示す。
カーカス層２のコード材料としては、ナイロ
ン、レーヨン、ポリエステル等の有機繊維が用い
られている。これらの繊維は、通常、５〜10ｇ／
ｄ程度の強度を有している。
本発明においては、上記のようにベルト補強層
がスチールコード層からなる。ここでは、スチー
ルコード層を下側ベルト補強層３ｄと上側ベルト
補強層３ｕとの２層で示したが、必ずしも２層で
なくともよく、少なくとも２層以上であればよ
い。スチールコード層のスチールコードは、炭素
含有率0.62〜0.87％で、かつ、引張りり強度250
Kg／mm2以上のスチール線材から構成されるのが好
ましい。
上記ベルトカバー層５を構成する芳香族ポリア
ミド繊維コード層に用いる芳香族ポリアミド繊維
コードとしては、引張強度150Kg／mm2以上、引張
弾性率3000Kg／mm2以上の特性を有する芳香族ポリ
アミド繊維に、下記式で表わされる撚り係数Ｋ値
が1500≦Ｋ≦3500の範囲となるように撚りを加え
てコードとし、接着熱処理したものでよい。
Ｋ＝Ｔ√
Ｋ：撚り係数、
Ｔ：コードの撚り数（回／10cm）、
Ｄ：コードの総デニール数。
なお、2800≦Ｋ≦3400であることが、コードの
耐屈曲疲労性を向上させる上で最も好ましい。
この芳香族ポリアミド繊維コードは、従来カー
カスコードとして用いられているナイロン、レー
ヨン、ポリエステル等の有機繊維に比して強度面
において下記表１に示すように優れている。
[Technical Field of the Invention] The present invention improves the aromatic polyamide fiber cord that constitutes the reinforcing cord of the belt cover layer, which is laminated on the outside of the outermost layer of the belt reinforcing layer. This invention relates to a pneumatic radial tire that significantly improves tire durability by preventing separation failures that occur. [Prior art] In recent years, with the development of expressway networks and higher performance of passenger cars, the performance requirements for tires have become more sophisticated.
The diversification of skills knows no bounds. For example, it can run even faster than SR tires.
There are demands for HR tires, VR tires that can last longer and run at higher speeds, and flat tires with better longitudinal stability. Therefore, in order to prevent the tire from rising outward in the radial direction due to centrifugal force during high-speed running, steel cords are used as reinforcement cords, and the cords are intersected between plies on the outside of the outermost layer of the two-layer belt reinforcement layer. Attempts have been made to stack reinforcing cords made of nylon cords with belt cover layers arranged parallel to the tire circumferential direction at approximately 0° (parallel to the tire circumferential direction), and have achieved some degree of effectiveness. However, nylon cords have a In this case, it was not possible to improve the feeding stability due to the low relationship between fibers and nylon fibers.Recently, therefore, research has been carried out on using aromatic polyamide fiber cords, which have a significantly higher modulus than nylon cords, as reinforcing cords for the belt cover layer. In this way, the use of aromatic polyamide fiber cords as reinforcing cords for the belt cover layer is certainly effective compared to pneumatic radial tires in which belt cover layers are laminated with nylon cords as reinforcement cords. However, due to its molecular structure, aromatic polyamide fiber cord has poor adhesion to the cord rubber. There has been a problem in that so-called separation failure, in which the aromatic polyamide fiber cord and the cord rubber that make up the cover layer separate, reduces tire durability. An object of the present invention is to provide a pneumatic radial tire that improves tire durability by preventing separation at the splice portion when an aromatic polyamide fiber cord layer is used for the belt cover layer. [Invention] Therefore, the present invention comprises a pair of left and right bead portions, a pair of left and right sidewall portions connected to the bead portions, and a tread located between the pair of sidewall portions. A carcass layer is installed between the parts, and between the tread and the carcass layer,
At least two cords crossed each other between plies
A belt reinforcing layer consisting of a steel cord layer is arranged, and a belt cover layer consisting of an aromatic polyamide fiber cord layer having cords arranged substantially parallel to the circumferential direction of the tire is provided on the outside of the belt reinforcing layer. In the padded radial tire, the aromatic polyamide fiber cord layer has a diameter of 0.55 to 0.65 mm.
The present invention is characterized in that it is constructed by embedding 40 to 70 aromatic polyamide fiber cords per 5 cm in the perpendicular direction in a coated rubber having a 100% modulus of 30 Kg/cm 2 to 70 Kg/cm 2 . In this way, in the present invention, since the cord diameter, the number of ends (the number of cords used per 5 cm in the direction perpendicular to the cord), and the 10% modulus of the cord rubber (covering rubber) of the directional group polyamide fiber cord layer are specified, aromatic Since the polyamide fiber cord and the cord rubber are better compatible, it is possible to prevent separation at the splice portion of the belt cover layer made of the aromatic polyamide fiber cord layer. Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings. The first is a perspective view of an example of the pneumatic radial tire of the present invention. In Fig. 1, 1 is a tread, and 2 is a carcass layer installed between a pair of left and right bead parts 4, 4. The cord of the lower belt reinforcing layer 3d and the upper belt reinforcing layer 3u, in which the belt reinforcing layer 3d, the upper belt reinforcing layer 3u, and the belt cover layer 5 made of an aromatic polyamide fiber cord are arranged on the outer peripheral surface thereof.
The codes intersect with each other. This is to bring out the tag effect. Further, the cords of the belt cover layer 5 are substantially parallel to the tire circumferential direction. This is to prevent tires from rising due to centrifugal force when driving at high speeds. 5s is a splice portion of the belt cover layer 5. A pair of left and right bead parts 4, 4 to 6, 6
A pair of left and right sidewalls that connect to the
The carcass layer 2 is folded back around the bead at the bead portion 4. EE′ indicates the tire circumferential direction. As the cord material for the carcass layer 2, organic fibers such as nylon, rayon, and polyester are used. These fibers are usually 5-10g/
It has a strength of about d. In the present invention, the belt reinforcing layer is made of a steel cord layer as described above. Here, the steel cord layer is shown as having two layers, the lower belt reinforcing layer 3d and the upper belt reinforcing layer 3u, but it does not necessarily have to be two layers, and may be at least two layers or more. The steel cord in the steel cord layer has a carbon content of 0.62~0.87% and a tensile strength of 250
Preferably, it is made of steel wire with a weight of Kg/mm 2 or more. The aromatic polyamide fiber cord used for the aromatic polyamide fiber cord layer constituting the belt cover layer 5 is an aromatic polyamide fiber having a tensile strength of 150 Kg/mm 2 or more and a tensile modulus of 3000 Kg/mm 2 or more. A cord may be twisted so that the twist coefficient K expressed by the following formula falls within the range of 1500≦K≦3500, and then subjected to adhesive heat treatment. K=T√ K: Twist coefficient, T: Number of twists of cord (twists/10cm), D: Total denier of cord. Note that it is most preferable that 2800≦K≦3400 in order to improve the bending fatigue resistance of the cord. This aromatic polyamide fiber cord is superior in strength to organic fibers such as nylon, rayon, and polyester that have been conventionally used as carcass cords, as shown in Table 1 below.
以上説明したように本発明によれば、ベルト補
強層をプライ間でコードが互いに交差した少なく
とも２層のスチールコード層で構成し、かつ、ベ
ルトカバー層をコードがタイヤ周方向とほぼ平行
に配置された芳香族ポリアミド繊維コード層とで
構成すると共に、直径0.55〜0.65mmの芳香族ポリ
アミド繊維コードを100％モジユラスが30Kg／cm2
〜70Kg／cm2の被覆ゴム中にコードに直角方向５cm
当り40本〜70本埋め込んで該芳香ポリアミド繊維
コード層を構成したので、タイヤの耐久性、特に
芳香族ポリアミド繊維コード層からなるベルトカ
バー層のスプライス部の耐久性を向上させること
ができる。
As explained above, according to the present invention, the belt reinforcing layer is composed of at least two steel cord layers in which the cords intersect with each other between the plies, and the belt cover layer is arranged such that the cords are arranged substantially parallel to the tire circumferential direction. It consists of a 100% aromatic polyamide fiber cord layer with a diameter of 0.55 to 0.65 mm and a modulus of 30 kg/cm 2.
5cm perpendicular to the cord in ~70Kg/ cm2 coated rubber
Since the aromatic polyamide fiber cord layer is constructed by embedding 40 to 70 cords per aromatic polyamide fiber cord layer, it is possible to improve the durability of the tire, particularly the durability of the splice portion of the belt cover layer made of the aromatic polyamide fiber cord layer.
第１図は本発明の空気入りラジアルタイヤの一
例の半断面斜視図、第２図は芳香族ポリアミド繊
維コード径と耐久性との関係図、第３図は従来タ
イヤのベルト補強層の断面図、第４図は本発明タ
イヤのベルト補強層としての芳香族ポリアミド繊
維コードの断面図である。
１……トレツド、２……カーカス層、３ｄ……
下側ベルト補強層、３ｕ……上側ベルト補強層、
５……ベルトカバー層、５ｓ……スプライス部、
６……サイドウオール部。
Fig. 1 is a half-sectional perspective view of an example of the pneumatic radial tire of the present invention, Fig. 2 is a diagram showing the relationship between aromatic polyamide fiber cord diameter and durability, and Fig. 3 is a sectional view of the belt reinforcing layer of a conventional tire. , FIG. 4 is a sectional view of an aromatic polyamide fiber cord as a belt reinforcing layer of the tire of the present invention. 1... Tortled, 2... Carcass layer, 3d...
Lower belt reinforcement layer, 3u...Upper belt reinforcement layer,
5... Belt cover layer, 5s... Splice part,
6...Side wall section.
Claims (1)
る左右一対のサイドウオール部と、該一対のサイ
ドウオール部間に位置するトレツドからなり、該
左右一対のビード部間にカーカス層が装架され、
トレツドとカーカス層との間に、プライ間でコー
ドが互いに交差した少なくとも２層のスチールコ
ード層からなるベルト補強層が配置され、該ベル
ト補強層の外側に、コードがタイヤ周方向とほぼ
平行に配置された芳香族ポリアミド繊維コード層
からなるベルトカバー層が設けられた空気入りラ
ジアルタイヤにおいて、前記芳香族ポリアミド繊
維コード層が、直径0.55〜0.65mmの芳香族ポリア
ミド繊維コードを100％モジユラスが30Kg／cm3〜
70Kg／cm2の被覆ゴム中にコードに直角方向５cm当
り40本〜70本埋め込んで構成された空気入りラジ
アルタイヤ。1 Consists of a pair of left and right bead parts, a pair of left and right sidewall parts connected to the bead parts, and a tread located between the pair of sidewall parts, and a carcass layer is installed between the pair of left and right bead parts. is,
A belt reinforcing layer consisting of at least two steel cord layers with cords crossing each other between the plies is arranged between the tread and the carcass layer, and the cords are arranged on the outside of the belt reinforcing layer in a manner substantially parallel to the tire circumferential direction. In a pneumatic radial tire provided with a belt cover layer made of arranged aromatic polyamide fiber cord layers, the aromatic polyamide fiber cord layer comprises 100% aromatic polyamide fiber cords with a diameter of 0.55 to 0.65 mm and a modulus of 30 kg. / cm3 ~
A pneumatic radial tire consisting of 40 to 70 cords embedded per 5cm perpendicular to the cord in a 70Kg/ cm2 coated rubber.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59133259A JPS6112408A (en) | 1984-06-29 | 1984-06-29 | Aired radial tire for passenger car |
| KR1019850003749A KR920007837B1 (en) | 1984-06-29 | 1985-05-30 | Pneumatic radial tire of passenger car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59133259A JPS6112408A (en) | 1984-06-29 | 1984-06-29 | Aired radial tire for passenger car |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6112408A JPS6112408A (en) | 1986-01-20 |
| JPH0443805B2 true JPH0443805B2 (en) | 1992-07-17 |
Family
ID=15100433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59133259A Granted JPS6112408A (en) | 1984-06-29 | 1984-06-29 | Aired radial tire for passenger car |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS6112408A (en) |
| KR (1) | KR920007837B1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0228005A (en) * | 1988-07-15 | 1990-01-30 | Sumitomo Rubber Ind Ltd | Pneumatic radial tire |
| JPH03128702A (en) * | 1989-07-24 | 1991-05-31 | Sumitomo Rubber Ind Ltd | Heavy duty tire |
| CA2018018C (en) * | 1989-08-10 | 1999-10-05 | Rene Francois Reuter | Pneumatic tire |
| JP2767501B2 (en) * | 1991-04-11 | 1998-06-18 | 横浜ゴム株式会社 | Pneumatic radial tires for passenger cars |
| WO1994014625A1 (en) * | 1992-12-28 | 1994-07-07 | Bridgestone Corporation | Pneumatic radial tire |
| EP1047564A1 (en) * | 1997-11-19 | 2000-11-02 | THE GOODYEAR TIRE & RUBBER COMPANY | Radial medium truck tire with multifilament top belt |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411562A (en) * | 1977-06-29 | 1979-01-27 | Toyoda Autom Loom Works Ltd | Cooler drier for granular matter |
| JPS55132308A (en) * | 1978-12-07 | 1980-10-15 | Uniroyal Ag | Tire for vehicle |
| JPS5623804A (en) * | 1979-08-03 | 1981-03-06 | Suzue Agric Mach | Automatic tillage adjusting device in walking power tiller |
| JPS5695704A (en) * | 1979-12-06 | 1981-08-03 | Dunlop Co Ltd | Pneumatic tire |
| JPS5731204B2 (en) * | 1975-06-06 | 1982-07-03 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0122721Y2 (en) * | 1980-07-30 | 1989-07-10 |
-
1984
- 1984-06-29 JP JP59133259A patent/JPS6112408A/en active Granted
-
1985
- 1985-05-30 KR KR1019850003749A patent/KR920007837B1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5731204B2 (en) * | 1975-06-06 | 1982-07-03 | ||
| JPS5411562A (en) * | 1977-06-29 | 1979-01-27 | Toyoda Autom Loom Works Ltd | Cooler drier for granular matter |
| JPS55132308A (en) * | 1978-12-07 | 1980-10-15 | Uniroyal Ag | Tire for vehicle |
| JPS5623804A (en) * | 1979-08-03 | 1981-03-06 | Suzue Agric Mach | Automatic tillage adjusting device in walking power tiller |
| JPS5695704A (en) * | 1979-12-06 | 1981-08-03 | Dunlop Co Ltd | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6112408A (en) | 1986-01-20 |
| KR920007837B1 (en) | 1992-09-18 |
| KR860000166A (en) | 1986-01-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |