Patent US3255171A successfully refreshed from Google Patents.
US3255171A
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Purification of recycle ethylene in the high pressure polymerization of ethylene
Assignee: BASF SE
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Filing: 1962-08-23
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Granted: 1966-06-07
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Expires: 1982-08-23
Abstract
No abstract record available.
Inventors
- 👤 Eilbracht Hans
- 👤 Rotzoll Rudi-Heinz
- 👤 Trieschmann Hans-Georg
- 👤 Urban Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:23
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT POLYETHYLENE BY POLYMERIZING ETHYLENE AT A PRESSURE BETWEEN 1,000 AND 4,000 ATMOSPHERES, SEPARATING THE POLYETHYLENE FROM THE UNREACTED ETHYLENE, AND RECYCLING THE UNREACTGED ETHYLENE AFTER SEPARATION FROM THE POLYETHYLENE, THE IMPROVEMENT WHICH COMPRISES WASHING 25% TO 100% BY WEIGHT OF THE RECYCLED ETHYLENE CONTAINING UP TO 0.5% BY WEIGHT OF IMPURITIES COMPRISING LOW MOLECULAR WEIGHT POLYMERS OF ETHYLENE WITH MOLECULAR WEIGHTS OF LESS THAN 1000, 2-ETHYL-BUTANE-(1), KETONES AND ALDEHYDES AT A PRESSURE BETWEEN 20 AND 50 ATMOSPHERES WITH LIQUID ETHYLENE AT A TEMPERATURE BETWEEN -25*C. AND 0*C. AND THEREBY REMOVING FROM THE RECYCLED ETHYLENE
Claim 2
Dependent Claim
104 words
IN A PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT POLYETHYLENE BY POLYMERIZING ETHYLENE AT A PRESSURE BETWEEN 1,000 AND 4,000 ATMOSPHERES, SEPARATING THE POLYETHYLENE FROM THE UNREACTED ETHYLENE, AND RECYCLING THE UNREACTGED ETHYLENE AFTER SEPARATION FROM THE POLYETHYLENE, THE IMPROVEMENT WHICH COMPRISES WASHING 25% TO 100% BY WEIGHT OF THE RECYCLED ETHYLENE CONTAINING UP TO 0.5% BY WEIGHT OF IMPURITIES COMPRISING LOW MOLECULAR WEIGHT POLYMERS OF ETHYLENE WITH MOLECULAR WEIGHTS OF LESS THAN 1000, 2-ETHYL-BUTANE-(1), KETONES AND ALDEHYDES AT A PRESSURE BETWEEN 20 AND 50 ATMOSPHERES WITH LIQUID ETHYLENE AT A TEMPERATURE BETWEEN -25*C. AND 0*C. AND THEREBY REMOVING FROM THE RECYCLED ETHYLENE
References Cited (Backward Citations)
US1958553A
Cited
US2852501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |