Patent US4191523A successfully refreshed from Google Patents.
US3814743A
Expired / Lapsed
US
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Process for polymerizing alpha-olefins
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1964-11-13
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Granted: 1974-06-04
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Expires: 1984-11-13
Abstract
Abstract HIGH POLYMERIZATION RATES FOR ALPHA-OLEFINS ARE OBTAINED BY DRY MILLING A PREFORMED PARTIALLY REDUCED TRANSITION METAL HALIDE ALONE OR COCRYSTALLIZED WITH A GROUP II OR III METAL HALIDE PRIOR TO ACTIVATION WITH AN ORGANOMETALLIC COMPOUND. EXAMPLES OF THE TRANSITION METAL HALIDE ARE PURPLE CRYSTALLINE TITANIUM TRICHLORIDE AND PURPLE CRYSTALLINE TITANIUM TRICHLORIDE COCRYLSTALLINE WITH ALUMINUM TRICHLORIDE.
Inventors
- 👤 E Tornqvist
- 👤 A Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:54
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/906
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |