Patent US3770657A successfully refreshed from Google Patents.
US3770657A
Expired / Lapsed
US
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Removal of titanium tetrachloride from titanium trichloride aluminum trichloride
Assignee: Phillips Petroleum Co
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Filing: 1970-02-09
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Granted: 1973-11-06
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Expires: 1990-02-09
Abstract
Abstract AN IMPROVED PROCESS FOR PRODUCING CO-CRYSTALS OF TITANIUM TRICHLORIDE AND ALUMINUM TRICHLORIDE WITH A COMPOSITION OF SUBSTANTIALLY THREE MOLES OF TITANIUM TRICHLORIDE AND ONE MOLE OF ALUMINUM TRICHLORIDE OR OTHER DESIRED RATIO, AND SUBSTANTIALLY FREE OF IMPURITIES IS DESCRIBED. SUCH CRYSTALS ARE OF VALUE AS AN ACTIVE CATALYST, PARTICULARLY, FOR EXAMPLE, FOR PREPARING POLYPROPYLENE. THE IMPROVED PROCESS PROVIDED HEREIN INVOLVES THE REMOVAL OF TRACES OF TITANIUM TETRACHLORIDE FROM ALREADY FORMED CO-CRYSTALS BY BALL MILLING THE CO-CRYSTALS IN THE PRESENCE OF A SUFFICIENT QUANTITY OF ALUMINUM POWDER TO SUBSTANTIALLY QUANTITATIVELY REACT WITH TITANIUM TETRACHLORIDE.
Inventors
- 👤 A Haag
- 👤 M Weiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:22
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/002; B; B01; B01J; B01J27/00; B01J27/06; C01P; C01P2002/00; C01P2002/50
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |