US3637899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric block copolymers and methods of producing the same
Assignee: Individual
•
Filing: 1969-04-08
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Granted: 1972-01-25
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Expires: 1989-04-08
Abstract
Abstract A METHOD OF PRODUCING ELASTOMERIC BLOCK COPOLYMERS OF THE TYPE A-B-A, WHEREIN BLOCK A IS A POLYMER OF VINYLTRIORGANOSILANES HAVING A MOLECULAR WEIGHT OF 5,000 TO 200,000 AND BLOCK B IS A POLYMER OF A CONJUGATED DIENE HAVING A MOLECULAR WEIGHT OF 15,000-500,000, BY ANIONIC BLOCK COPOLYMERIZATION OF VINYLTRIORGANOSILANES OR A MIXTURE OF THE SAM WITH STYRENE OR A DERIVATIVE OF STYRENE, AND CONJUGATED DIENES IN AN ORGANIC SOLVENT IN THE PRESENCE OF A LITHIUM-BASED CATALYST.
Inventors
- 👤 Nikolai Sergeevich Nametkin
- 👤 Sergei Garievich Durgarian
- 👤 Evgeny Vladimirovich Soloviev
- 👤 Viktor Maxovich Piryatinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:38
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02
Claims Analysis
Total Claims: 0
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |