US3141872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization catalyst and stereospecific polymerization of propylene therewith
Assignee: Montedison SpA
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Filing: 1960-04-14
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Granted: 1964-07-21
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Expires: 1980-04-14
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Pino Piero
- 👤 Mazzanti Giorgio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:29
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A POLYMERIZATION CATALYST CONSISTING ESSENTIALLY OF THE PRODUCT FORMED BY MIXING (1) A SOLID, VIOLET CRYSTALLINE MATERIAL COMPRISING VIOLET CRYSTALLINE TITANIUM TRICHLORIDE WITH (2) A DIALKYL ALUMINUM MONOHALIDE IN WHICH THE ALKYL GROUPS CONTAIN FROM 2 TO 4 CARBON ATOMS, THE MIXING BEING CARRIED OUT AT A TEMPERATURE UP TO 90*C. IN A LIQUID DILUENT SUBSTANTIALLY INERT TO SAID MONOHALIDE, TO OBTAIN A CATALYST IN WHICH NONE OF THE TITANIUM IS REDUCED BELOW THE TRIVALENT STATE.
Claim 2
Dependent Claim
76 words
A POLYMERIZATION CATALYST CONSISTING ESSENTIALLY OF THE PRODUCT FORMED BY MIXING (1) A SOLID, VIOLET CRYSTALLINE MATERIAL COMPRISING VIOLET CRYSTALLINE TITANIUM TRICHLORIDE WITH (2) A DIALKYL ALUMINUM MONOHALIDE IN WHICH THE ALKYL GROUPS CONTAIN FROM 2 TO 4 CARBON ATOMS, THE MIXING BEING CARRIED OUT AT A TEMPERATURE UP TO 90*C. IN A LIQUID DILUENT SUBSTANTIALLY INERT TO SAID MONOHALIDE, TO OBTAIN A CATALYST IN WHICH NONE OF THE TITANIUM IS REDUCED BELOW THE TRIVALENT STATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |