Patent US2930783A successfully refreshed from Google Patents.
US2930783A
Expired / Lapsed
US
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Method of purifying low-pressure polyolefines
Assignee: Huels AG
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Filing: 1956-10-29
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Granted: 1960-03-29
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Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 Weber Heinrich
- 👤 Paul Hermann
- 👤 Reimold Else
- 👤 Reimold Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:44
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
PROCESS FOR THE PURIFICATION OF A CRUDE LOW-PRESSURE POLYOLEFINE PRODUCED BY LOW-PRESSURE POLYMERIZATION OF AN A-OLEFINE CONTAINING FROM 2 TO 6 CARBON ATOMS IN THE PRESENCE OF A CATALYST FORMED BY REACTING TITANIUM TETRACHLORIDE WITH AN ALUMINIUMALKYLCHLORIDE THE STEP WHICH COMPRISES TREATING SAID CRUDE LOW-PRESSURE POLYOLEFINE IN THE PRESENCE OF AN INERT SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND HYDROAROMATIC HYDROCARBONS CONTAINNG FROM 4 TO 12 CARBON ATOMS WITH A LIQUID ORGANIC CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF TETRAHYDROFURAN, DIOXAN, FURAN AND PYRAN, THEREAFTER WASHING WITH WATER UNTIL THE WATER IS FREE FROM METAL COMPOUNDS AND SEPARATING AND DRYING THE PURIFIED LOWPRESSURE POLYOLEFINE.
Claim 2
Dependent Claim
107 words
PROCESS FOR THE PURIFICATION OF A CRUDE LOW-PRESSURE POLYOLEFINE PRODUCED BY LOW-PRESSURE POLYMERIZATION OF AN A-OLEFINE CONTAINING FROM 2 TO 6 CARBON ATOMS IN THE PRESENCE OF A CATALYST FORMED BY REACTING TITANIUM TETRACHLORIDE WITH AN ALUMINIUMALKYLCHLORIDE THE STEP WHICH COMPRISES TREATING SAID CRUDE LOW-PRESSURE POLYOLEFINE IN THE PRESENCE OF AN INERT SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND HYDROAROMATIC HYDROCARBONS CONTAINNG FROM 4 TO 12 CARBON ATOMS WITH A LIQUID ORGANIC CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF TETRAHYDROFURAN, DIOXAN, FURAN AND PYRAN, THEREAFTER WASHING WITH WATER UNTIL THE WATER IS FREE FROM METAL COMPOUNDS AND SEPARATING AND DRYING THE PURIFIED LOWPRESSURE POLYOLEFINE.
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) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |