Patent US3725331A successfully refreshed from Google Patents.
US3725331A
Expired / Lapsed
US
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Compositions containing amorphous 1,2-polybutadiene and cis-1,4-polybutadiene
Assignee: IFP Energies nouvelles
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Filing: 1970-10-08
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Granted: 1973-04-03
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Expires: 1990-10-08
Abstract
Abstract New compositions consisting of 40-75 percent by weight of amorphous 1,2-polybutadiene having a molecular weight above 50,000 and 25-60 % by weight of 1,4-cis polybutadiene having a molecular weight above 100,000 result in sulfur vulcanizates having a low brittle point, a high elasticity modulus, and a low rebound and which swell to a relatively low degree when immersed in benzene.
Inventors
- 👤 J Lesage
- 👤 F Dawans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:51
CPC Classifications
C; C08; C08L; C08L7/00; C08L9/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
8 words
A sulfur-vulcanizate of the composition of claim 1.
Claim 2
Dependent Claim
12 words
A composition as defined by claim 1 further comprising an aromatic oil.
Claim 3
Dependent Claim
8 words
A sulfur-vulcanizate of the composition of claim 3.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |