US3554260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass cord reinforcement of elastomeric articles
Assignee: Uniroyal Inc
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Filing: 1969-01-06
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Granted: 1971-01-12
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Expires: 1989-01-06
Abstract
Abstract The elimination or reduction of broken glass cords in pneumatic tires is accomplished by using cords with tensile efficiency greater than 75 percent and a twist product within the range of zero to 0.300 turns. Tensile efficiency is a ratio of the inrubber tensile strength of the cord to its theoretical, calculated tensile strength.
Inventors
- 👤 Paul S Shoemaker
- 👤 Wlater K Klamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:50
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D02G3/48; B; B60; B60C; B60C9/00; B60C9/0028; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
The glass cord of claim 1, wherein said cord is used as a reinforcement element in the breaker structure of a pneumatic tire.
Claim 2
Dependent Claim
122 words
A glass cord for use as a reinforcement element in a pneumatic tire, said cord being comprised of a plurality of glass filaments, said cord having a twist product within the range from zero to and including 0.300 turns, and the ratio, expressed as a percentage, of the in-rubber tensile strength of said cord to its theoretical tensile strength being at least 75 percent, the in-rubber tensile strength being the tensile strength at break of the center cord of a test sample consisting of three parallel glass cords embedded in vulcanized rubber, the test sample being pulled at the rate of two inches per minute in a tensile-testing machine, and the theoretical tensile strength of said cord being calculated from the equation
Claim 3
Dependent Claim
23 words
The glass cord of claim 3, wherein said cord is used as a reinforcement element in the breaker structure of a pneumatic tire.
Claim 4
Dependent Claim
40 words
A pneumatic tire containing a glass cord comprised of a plurality of filaments, said cord having a twist product within the range from zero to and including 0.300 turns, and said cord having a tensile efficiency greater than 75 percent.
Claim 5
Dependent Claim
39 words
A breaker reinforced with glass cord comprised of a plurality of filaments, said cord having a twist product within the range from zero to and including 0.300 turns, and said cord having a tensile efficiency greater than 75 percent.
Claim 6
Dependent Claim
43 words
A pneumatic tire containing a breaker reinforced with glass cord comprised of a plurality of filaments, said cord having a twist product within the range from zero to and including 0.300 turns, and said cord having a tensile efficiency greater than 75 percent.
Claim 7
Dependent Claim
70 words
A bias ply tire containing a breaker reinforced with glass cord comprised of a plurality of filaments, said breaker being comprised of at least two layers of parallel glass cords and the cords in alternate layers being directed at opposite bias angles, said cord having a twist product within the range from zero to and including 0.300 turns, and said cord having a tensile efficiency of at least 75 percent.
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |