US4176513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel wire cord
Assignee: Dunlop Ltd
•
Filing: 1977-09-01
•
Granted: 1979-12-04
•
Expires: 1997-09-01
Abstract
Abstract A steel wire cord which comprises an assembly of strands each of which comprises a plurality of filaments of steel, said filaments having been drawn to give a reduction in their cross-sectional area of less than 96%, the strand helix angle being not less than 40 DEG and the filament helix angle being not less than 20 DEG .
Inventors
- 👤 Maurice A. Young
- 👤 Leonhard W. Hamacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/06; D07B1/0606; D07B1/0613; B; B60; B60C; B60C9/00; B60C9/0007; C; C21; C21D; C21D8/00; C21D8/06; D07B2201/00; D07B2201/10; D07B2201/104; D07B2201/1052; D07B2201/1064; D07B2201/1068; D07B2205/00; D07B2205/30; D07B2205/3021; D07B2205/3025; D07B2205/3046; D07B2205/3053; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
65 words
A steel wire cord which comprises an assembly of strands each having a plurality of filaments of steel, said filaments having been drawn, after at least one heat treatment, to give a reduction in their cross-sectional area after the last heat treatment, of less than 96%, the strand helix angle being not less than 20° and the filament helix angle being not less than 40°.
Claim 2
Dependent Claim
65 words
A steel wire cord which comprises an assembly of strands each having a plurality of filaments of steel, said filaments having been drawn, after at least one heat treatment, to give a reduction in their cross-sectional area after the last heat treatment, of less than 96%, the strand helix angle being not less than 20° and the filament helix angle being not less than 40°.
Claim 3
Dependent Claim
22 words
A steel wire cord according to claim 1, in which the strand helix angle is in the range from 20° to 30°.
Claim 4
Dependent Claim
22 words
A steel wire cord according to claim 1 in which the filament helix angle is in the range from 50° to 60°.
Claim 5
Dependent Claim
59 words
A steel wire cord according to claim 1, in which the strand helix angle and the filament helix angle are substantially the same as those obtained using a 3×3×0.175 mm Lang's lay construction where the lay of strands in the cord is less than 3.0 mm and the lay of filaments in the strands is less than 1.5 mm.
Claim 6
Dependent Claim
20 words
A steel wire cord according to claim 1 in which said reduction in cross-sectional area is in the range 90-96%.
Claim 7
Dependent Claim
20 words
A steel wire cord according to claim 5, in which said reduction in cross-sectional area is in the range 95-96%.
Claim 8
Dependent Claim
15 words
A steel wire cord according to claim 1 which is of a Lang's lay construction.
Claim 9
Dependent Claim
25 words
A steel wire cord according to claim 1 in which the diameter of the wire before drawing is in the range 0.75 to 1 mm.
Claim 10
Dependent Claim
16 words
A steel wire cord according to claim 1 in which the steel is a manganese steel.
Claim 11
Dependent Claim
30 words
A steel wire cord according to claim 9, in which the steel contains 0.67-0.72%, 0.4-0.7% manganese, 0.25% (maximum) silicon, 0.025% (maximum) phosphorus, 0.025% (maximum) sulphur, 0.01% copper and 0.02% chromium.
Claim 12
Dependent Claim
16 words
A steel wire cord according to claim 1 which has been embedded in an elastomeric material.
Claim 13
Dependent Claim
15 words
A vehicle tire containing as reinforcement a steel wire cord as claimed in claim 1.
Claim 14
Dependent Claim
85 words
A steel wire cord reinforced elastomeric article which comprises an assembly of strands each having a plurality of filaments of steel, said filaments having been drawn after at least one heat treatment, to give a reduction in their cross-sectional area after the last heat treatment in the range of 95% to 96%, the strand helix angle being not less than 20° and the filament helix angle being not less than 40°, said assembly of strands being embedded in elastomeric material to form a reinforcement thereof.
Claim 15
Dependent Claim
85 words
A steel wire cord reinforced elastomeric article which comprises an assembly of strands each having a plurality of filaments of steel, said filaments having been drawn after at least one heat treatment, to give a reduction in their cross-sectional area after the last heat treatment in the range of 95% to 96%, the strand helix angle being not less than 20° and the filament helix angle being not less than 40°, said assembly of strands being embedded in elastomeric material to form a reinforcement thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |