Patent US3271376A successfully refreshed from Google Patents.
US3271376A
Expired / Lapsed
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Catalyst system for the copolymerization of olefins
Assignee: Avisun Corp
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Filing: 1962-08-30
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Granted: 1966-09-06
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Expires: 1982-08-30
Abstract
No abstract record available.
Inventors
- 👤 Marco A Achon
- 👤 John A Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:56
CPC Classifications
C; C08; C08F; C08F210/00; C08F10/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
119 words
A PROCESS FOR THE COPOLYMERIZATION OF ETHYLENE AND PROPYLENE WHICH COMPRISES CONTACTING, IN AN INERT SOLVENT, AND AT A TEMPERATURE OF FROM ABOUT 20*C. TO ABOUT 200*C., A MIXTURE OF ETHYLENE AND PROPYLENE WITH A CATALYST CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF AN ALUMINUM ALKYL DIHALIDE, A VANADIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF VANADIUM TETRACHLORIDE, VANADIUM OXYTRICHLORIDE, AND A SILANE OF THE FORMULA R3R''SI IN WHICH R'' IS AN ALKOXY RADICAL AND R IS SELECTED FROM THE GROUP CONSISTING OF ALKOXY RADICALS AND HYDROCARBON RADICALS, WHEREIN THE MOL RATIO OF ALUMINUM ALKYL DIHALIDE TO SILANE IS FROM 1:1 TO 100:1 AND THE MOL RATIO OF ALUMINUM ALKYL DIHALIDE TO VANADIUM OXYTRICHLORIDE IS FROM 0.2:1 TO 10:1.
References Cited (Backward Citations)
US2886561A
Cited
US3048574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |