US3671478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber compositions
Assignee: Dunlop Holdings Ltd
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Filing: 1970-11-09
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Granted: 1972-06-20
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Expires: 1990-11-09
Abstract
Abstract A vulcanizable composition which comprises natural rubber and/or synthetic rubber and a minor proportion of boric oxide. Preferably the amount of boric oxide is not greater than 20 parts by weight per 100 parts by weight of rubber.
Inventors
- 👤 George Mitchel Doyle
- 👤 Robert Eric Humphreys
- 👤 Peter Lothar Ernst Moring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:43
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08K; C08K3/00; C08K3/38; C08J2321/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31826
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
29 words
A vulcanizable composition according to claim 1 in which the amount of boric oxide is not greater than 20 parts by weight per 100 parts by weight of rubber.
Claim 2
Dependent Claim
31 words
A vulcanizable composition according to claim 2 in which the amount of boric oxide is in the range 0.5 to 10 parts by weight per 100 parts by weight of rubber.
Claim 3
Dependent Claim
31 words
A vulcanizable composition according to claim 3 in which the amount of boric oxide is in the range 1 to 5 parts by weight per 100 parts by weight of rubber.
Claim 4
Dependent Claim
16 words
A vulcanizable composition according to claim 1 in which the synthetic rubber is a styrene/butadiene rubber.
Claim 5
Dependent Claim
16 words
A vulcanizable composition according to claim 1 in which the synthetic rubber is a polychloroprene rubber.
Claim 6
Dependent Claim
14 words
A vulcanizable composition according to claim 1 in which the composition contains carbon black.
Claim 7
Dependent Claim
22 words
A vulcanizable composition according to claim 7 in which at least a portion of the carbon black is a hydrophobic carbon black.
Claim 8
Dependent Claim
16 words
A vulcanizable composition according to claim 1 in which the rubber is an oil extended rubber.
Claim 9
Dependent Claim
18 words
A vulcanizable composition according to claim 1 which contains sulphur and a sulphenamide-type accelerator as the vulcanization system.
Claim 10
Dependent Claim
18 words
A vulcanizable composition according to claim 1 which contains sulphur and a thiazole-type accelerator as the vulcanization system.
Claim 11
Dependent Claim
11 words
A vulcanizable composition according to claim 1 which contains stearic acid.
Claim 12
Dependent Claim
15 words
A vulcanizable composition according to claim 1 which is reinforced with a textile reinforcement member.
Claim 13
Dependent Claim
15 words
A vulcanizable composition according to claim 13 in which the textile reinforcement member is rayon.
Claim 14
Dependent Claim
16 words
A vulcanizable composition according to claim 13 in which the textile reinforcement member is a polyester.
Claim 15
Dependent Claim
22 words
A vulcanizable composition according to claim 13 in which the textile reinforcement member is in the form of polyester yarns or cords.
Claim 16
Dependent Claim
27 words
A vulcanizable composition according to claim 13 in whicH the composition containing boric oxide is in the form of a barrier layer around the textile reinforcement member.
Claim 17
Dependent Claim
39 words
A reinforced rubber article comprising a textile reinforcing member and a vulcanizate obtained by curing a vulcanizable rubber composition, the rubber composition comprising a rubber selected from the group consisting of diene rubbers and ethylene-propylene rubbers, and boric oxide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |