Patent US3000871A successfully refreshed from Google Patents.
US3000871A
Expired / Lapsed
US
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Method for purifying polyolefin
Assignee: Shell USA Inc
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Filing: 1959-01-09
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Granted: 1961-09-19
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Expires: 1979-01-09
Abstract
No abstract record available.
Inventors
- 👤 Willem F Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:43
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR THE SEPARATION OF A CATALYST CONSISTING ESSENTIALLY OF CHROMIUM OXIDE CARRIED ON A ALUMINA-SILICA CARRIER FROM OLEFIN POLYMERS AND A HYDROCARBON SOLVENT COMPRISING, ADDING AN AQUEOUS SOLUTION OF FROM 0.1 TO 1% BY WEIGHT OF A NON-IONIC SURFACE-ACTIVE AGENT TO SAID CATALYST-POLYOLEFIN MIXTURE, HEATING SAID MIXTURE AND SAID SOLUTION TO A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN WHILE INCREASING THE PRESSURE IN AN AMOUNT SUFFICIENT TO PREVENT BOILING OF THE WATER PRESENT IN THE MEDIUM, AGITATING THE MEDIUM TO TRANSFER CATALYST FROM THE ORGANIC PHASE COMPRISING POLYOLEFIN TO THE AQUEOUS PHASE, AND SEPARATING THE ORGANIC PHASE CONTAINING POLYMER FROM THE AQUEOUS PHASE.
Claim 2
Dependent Claim
107 words
A PROCESS FOR THE SEPARATION OF A CATALYST CONSISTING ESSENTIALLY OF CHROMIUM OXIDE CARRIED ON A ALUMINA-SILICA CARRIER FROM OLEFIN POLYMERS AND A HYDROCARBON SOLVENT COMPRISING, ADDING AN AQUEOUS SOLUTION OF FROM 0.1 TO 1% BY WEIGHT OF A NON-IONIC SURFACE-ACTIVE AGENT TO SAID CATALYST-POLYOLEFIN MIXTURE, HEATING SAID MIXTURE AND SAID SOLUTION TO A TEMPERATURE ABOVE THE SOFTENING POINT OF THE POLYOLEFIN WHILE INCREASING THE PRESSURE IN AN AMOUNT SUFFICIENT TO PREVENT BOILING OF THE WATER PRESENT IN THE MEDIUM, AGITATING THE MEDIUM TO TRANSFER CATALYST FROM THE ORGANIC PHASE COMPRISING POLYOLEFIN TO THE AQUEOUS PHASE, AND SEPARATING THE ORGANIC PHASE CONTAINING POLYMER FROM THE AQUEOUS PHASE.
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |