US4488587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic radial tires
Assignee: Bridgestone Corp
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Filing: 1983-05-25
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Granted: 1984-12-18
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Expires: 2003-05-25
Abstract
Abstract A pneumatic radial tire having an improved durable life is disclosed. In the pneumatic radial tire, a metal cord used in the carcass ply is characterized by having a layer construction of 3+9+1 wherein three filaments are twisted together to form a core, nine filaments each having the same diameter as in the filament for the core are twisted around the core to form a second layer and a single filament is wrapped around the second layer, and limiting a twisting angle α of the second layer to a range of 72.0°≦α≦78.0°.
Inventors
- 👤 Yujiro Umezawa
- 👤 Yoshio Suzuki
- 👤 Teruo Miura
- 👤 Kiyohito Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:52
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/06; D07B1/0606; D07B1/062; D07B1/0626; B; B60; B60C; B60C9/00; B60C9/0007; B60C9/18; B60C9/20; B60C9/2003; B60C9/2006; D07B1/0646; D07B1/0653; D07B2201/00; D07B2201/20; D07B2201/2015; D07B2201/2024; D07B2201/2025; D07B2201/2095; D07B2201/2097; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A pneumatic radial tire containing metal cords as a tire reinforcement comprising; a rubberized carcass ply having a metal cord coated with a coating rubber, said metal cord having a layer construction of 3+9+1 with three filaments twisted together to form a core, nine filaments each having the same diameter as in the filament for the core and twisted around the core to form a second layer and a single filament wrapped around the second layer, a twisting angle α of the second layer limited to a range of 72.0°≦α≦78.0°, and wherein the surfaces of the filaments forming said core are not covered with said coating rubber.
Claim 2
Dependent Claim
107 words
A pneumatic radial tire containing metal cords as a tire reinforcement comprising; a rubberized carcass ply having a metal cord coated with a coating rubber, said metal cord having a layer construction of 3+9+1 with three filaments twisted together to form a core, nine filaments each having the same diameter as in the filament for the core and twisted around the core to form a second layer and a single filament wrapped around the second layer, a twisting angle α of the second layer limited to a range of 72.0°≦α≦78.0°, and wherein the surfaces of the filaments forming said core are not covered with said coating rubber.
Claim 3
Dependent Claim
23 words
A pneumatic radial tire according to claim 1, wherein the filament in said core and/or second layer has a preforming ratio of 0.90-1.15.
Claim 4
Dependent Claim
37 words
A pneumatic tire of claim 2 wherein the diameter of the filaments of said core and said second layer are 0.15 mm, the diameter of said single filament is 0.12 mm and said preforming ratio is 1.0.
Claim 5
Dependent Claim
86 words
A pneumatic tire of claim 1 wherein said coating rubber covers said single filament and the outer surfaces of filaments forming said second layer, said coating rubber comprising, 90 parts by weight of natural rubber, 10 parts by weight of synthetic polyisoprene rubber, 50 parts by weight of carbon black HAF, 1 part by weight of an antioxidant, 2 parts by weight of aromatic oil, 50 parts by weight of ZnO, 0.5 part by weight of a vulcanization accelerator and 5 parts by weight of sulfur.
Claim 6
Dependent Claim
32 words
A pneumatic tire of claim 1 wherein the diameter of the filaments of said core and said second layer are 0.23 mm and the diameter of said single filament is 0.19 mm.
Claim 7
Dependent Claim
106 words
A pneumatic radial tire containing metal cords as a tire reinforcement comprising a rubberized belt ply having a metal cord coated with a coating rubber, said metal cord having a layer construction of 3+9+1 with three filaments twisted together to form a core, nine filaments each having the same diameter as in the filament for the core and twisted around the core to form a second layer and a single filament wrapped around the second layer, a twisting angle α of the second layer limited to a range of 72.0°≦α≦78.0°, and wherein surfaces of the filaments forming said core are not covered with said coating rubber.
Claim 8
Dependent Claim
106 words
A pneumatic radial tire containing metal cords as a tire reinforcement comprising a rubberized belt ply having a metal cord coated with a coating rubber, said metal cord having a layer construction of 3+9+1 with three filaments twisted together to form a core, nine filaments each having the same diameter as in the filament for the core and twisted around the core to form a second layer and a single filament wrapped around the second layer, a twisting angle α of the second layer limited to a range of 72.0°≦α≦78.0°, and wherein surfaces of the filaments forming said core are not covered with said coating rubber.
Claim 9
Dependent Claim
23 words
A pneumatic radial tire according to claim 6 wherein the filament in said core and/or second layer has a preforming ratio of 0.90-1.15.
References Cited (Backward Citations)
US416189A
Cited
US4158946A
Cited
US4332131A
Cited
US4258543A
Cited
US4349063A
Cited
US4333306A
Cited
JPS56163905A
Cited
GB2080845A
Cited
US4399853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |