US3663450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha olefin and diene polymerization catalyst
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1969-12-23
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Granted: 1972-05-16
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Expires: 1989-12-23
Abstract
Abstract A ZIEGLER-TYPE CATALYST SYSTEM FOR POLYMERIZING ALPHA OLEFINS AND CONJUGATED DIENES COMPRISING (A) A HYDROCARBON SOLUBLE ADDUCT OF A TITANIUM SUBHALIDE AND A LEWIS BASE, SUCH AS THE METHYL- AND DIMETHYL-DERIVATIVES OF TETRAHYDROFURAN AND TETRAHYDROTHIOPHENE AND (B) AN ORGANO ALUMINUM COMPOUND, SUCH AS DIETHYLALUMINUM CHLORIDE.
Inventors
- 👤 Charles Cozewith
- 👤 Erik G M Tornqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:58
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |