US3781262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for metalation
Assignee: Bridgestone Firestone Inc
•
Filing: 1972-02-04
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Granted: 1973-12-25
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Expires: 1992-02-04
Abstract
Abstract POLYMERS AND COPOLYMERS OF CONJUGATED DIENES (BUTADIENE, ISOPRENE, ETC.) AND COPOLYMERS OF SUCH A CONJUGATED DIENE WITH A VINYL AROMATIC HYDROCARBON (STYRENE, ETC.) ARE METALATED WITH AN ALKYL LIGHIUM, E.G. BUTYLITHIUM, TOGETHER WITH A MIXTURE OF (1) A POTASSIUM OR SODIUM ALKOXIDE AND (2) LIGHIUM-T-BUTOXIDE.
Inventors
- 👤 A Halasa
- 👤 M Stayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:23
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/26
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |