US4349063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic radial tires
Assignee: Bridgestone Corp
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Filing: 1980-12-12
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Granted: 1982-09-14
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Expires: 2000-12-12
Abstract
Abstract A pneumatic radial tire is disclosed. This tire is reinforced with steel cords, each of which has such a flat or elliptic section that two or three strands, each strand being produced by twisting plural filaments, are arranged in parallel with each other so as to make the twisting directions of the adjoining strands opposite to each other to form a core and plural filaments are twisted around the core and wrapped with a spiral filament.
Inventors
- 👤 Michitsugu Kikuchi
- 👤 Yoshio Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:14
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/06; D07B1/0606; D07B1/0613; B; B60; B60C; B60C9/00; B60C9/0007; D07B1/062; D07B1/22; D07B2201/00; D07B2201/10; D07B2201/1004; D07B2201/20; D07B2201/2001; D07B2201/2002; D07B2201/2003; D07B2201/2015; D07B2201/2016; D07B2201/2018; D07B2201/2023; D07B2201/2047; D07B2201/2052; D07B2201/2059; D07B2201/2061; D07B2201/2083; D07B2201/2087; D07B2501/00; D07B2501/20; D07B2501/2046; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
In a pneumatic radial tire containing steel cords as a reinforcement for at least one of the carcass and belt thereof, the improvement comprising; said steel cords having such a flat section inclusive of an elliptic section that two to three strands, each strand being produced by twisting plural filaments of 0.1-0.4 mm diameter, are arranged in parallel with each other to form a core and plural filaments are twisted around said core and wrapped with a spiral filament, the filaments in one strand constituting said core twisted in the "S" direction and the filaments in the adjacent strand twisted in the "Z" direction and, a ratio of a diameter of filaments twisted around said core corresponding to the bending direction of said core to a diameter of filaments constituting said core is 0.3-2.0.
Claim 2
Dependent Claim
134 words
In a pneumatic radial tire containing steel cords as a reinforcement for at least one of the carcass and belt thereof, the improvement comprising; said steel cords having such a flat section inclusive of an elliptic section that two to three strands, each strand being produced by twisting plural filaments of 0.1-0.4 mm diameter, are arranged in parallel with each other to form a core and plural filaments are twisted around said core and wrapped with a spiral filament, the filaments in one strand constituting said core twisted in the "S" direction and the filaments in the adjacent strand twisted in the "Z" direction and, a ratio of a diameter of filaments twisted around said core corresponding to the bending direction of said core to a diameter of filaments constituting said core is 0.3-2.0.
Claim 3
Dependent Claim
20 words
A pneumatic radial tire as claimed in claim 1, wherein said filaments twisted around said core are flat in section.
Claim 4
Dependent Claim
17 words
A pneumatic radial tire as claimed in claim 1, wherein said spiral filament is flat in section.
Claim 5
Dependent Claim
36 words
A pneumatic radial tire as claimed in claim 1, wherein said filaments constituting said core having a twisting pitch of 5-15 mm and said filaments twisted around said core have a twisting pitch of 10-18 mm.
Claim 6
Dependent Claim
20 words
A pneumatic radial tire as claimed in claim 1, wherein said filaments twisted around said core are elliptic in section.
Claim 7
Dependent Claim
17 words
A pneumatic radial tire as claimed in claim 1, wherein said spiral filaments is elliptic in section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |