Patent US4580873A successfully refreshed from Google Patents.
US3278643A
Expired / Lapsed
US
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Copolymerization of alpha-olefins in the presence of an alkyl aluminum dihalide, vanadium oxytrichloride and a phosphorus compound
Assignee: Avisun Corp
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Filing: 1963-02-04
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Granted: 1966-10-11
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Expires: 1983-02-04
Abstract
No abstract record available.
Inventors
- 👤 Achon Marco Antonio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:05
CPC Classifications
C; C08; C08F; C08F210/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A PROCESS FOR THE COPOLYMERIZATION OF ETHYLENE AND PROPYLENE WHICH COMPRISES CONTACTING, IN AN INERT SOLVENT, AT A TEMPERATURE OF FROM 0*C. TO 150*C., A MIXTURE OF ETHYLENE AND PROPYLENE CONTAINING FROM 20% TO 80% ETHYLENE WITH A CATALYST CONSISTING ESSENTIALLY OF THE PRODUCT OBTAINED BY MIXING AN ALUMINUM ALKYL DIHALIDE, VANADIUM OXYTRICHLORIDE, AND AN ORGANIC PHOSPHOROUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHOSPHATES, THIOPHOSPHATES, PHOSPHONATES, PHOSPHINES, AND PHOSPHINE OXIDES, WHEREIN THE MOL RATIO OF THE ALUMINUM COMPOUND TO VANADIUM OXYTRICHLORIDE IS FROM 1:1 TO 10:1, AND THE MOL RATIO OF ALUMINUM COMPOUND TO PHOSPHOROUS COMPOUND IS FROM 12:1 TO 1:1, AND RECOVERING AN ESSENTIALLY AMORPHOUS ETHYLENE-PROPYLENE COPOLYMER.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |