Patent US3580899A successfully refreshed from Google Patents.
US3580899A
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US
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Polymerization of isoprene
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1967-05-10
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Granted: 1971-05-25
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Expires: 1987-05-10
Abstract
Abstract A POLYMERIZATION CATALYST COMPRISING A MIXTURE OF (1) A HYDROCARBON SOLUTION OF A COMPLEX OF A DIARYL ETHER, SUCH AS DIPHENYL ETHER, AND A TETRAVALENT TITANIUM SALT, SUCH AS TITANIUM TETRACHLORIDE, AND (2) A HYDROCARBON SOLUTION OF A TRIALKYL ALUMINUM COMPOUND, SUCH AS TRIISOBUTYL ALUMINUM; THE CATALYST DESIRABLY FURTHER CONTAINING A DIENE COMPOUND, SUCH AS BUTADIENE OR ISOPRENE, AND BEING USEFUL IN A PROCESS FOR THE RAPID POLYMERIZATION OF ISOPRENE IN HIGH YIELD INTO HIGH MOLECULAR WEIGHT POLYMERS WHICH CAN BE FREE FROM GEL.
Inventors
- 👤 Jean-Marie Massoubre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:09
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/08; Y; Y10; Y10S; Y10S526/00; Y10S526/907
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |