US3723591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making articles from sulfur dioxide-conjugated diolefin-cyclopentadiene polymer
Assignee: Shell USA Inc
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Filing: 1970-11-06
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Granted: 1973-03-27
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Expires: 1990-11-06
Abstract
Abstract Hydrogenated terpolymers of a linear diolefin such as butadiene, SO2, and cyclopentadiene are converted by quenching from the melt to non-crystalline articles exhibiting unusually high impact resistance and superior tensile yield strength, heat distortion temperature and processing stability, compared to other hydrogenated terpolymeric polysulfones. The articles tend to retain the impact resistance even if later converted by annealing to a partly crystalline structure.
Inventors
- 👤 H Holler
- 👤 R Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:05
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
The method according to claim 1 wherein said linear diolefin is 1,3-butadiene.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |