US3637616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene copolymerization process
Assignee: EIDP Inc
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Filing: 1967-08-15
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Granted: 1972-01-25
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Expires: 1987-08-15
Abstract
Abstract IN THE COPOLYMERIZATION OF ETHYLENE WITH AN A-OLEFIN, SUCH AS PROPYLENE, IN A SOLVENT, E.G., N-HEXANE,REACTOR FOULING DUE TO HIGH ETHYLENE-CONTENT POLYMER FORMATION CAN BE REDUCED BY FEEDING ETHYLENE TO THE REACTOR BOTH AS A VAPOR AND A LIQUID, THE RATIO OF LIQUID PROPYLENE TO LIQUID ETHYLENE MAINTAINED HIGH ENOUGH TO FORM SOLVENTSOLUBLE COPOLYMER.
Inventors
- 👤 Robert E A Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:31
CPC Classifications
C; C08; C08F; C08F210/00
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |