US2988543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the treatment of poly-olefins
Assignee: Hoechst AG
•
Filing: 1956-04-03
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Granted: 1961-06-13
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Expires: 1976-04-03
Abstract
No abstract record available.
Inventors
- 👤 Meyer Kurt
- 👤 Jacob Ernst
- 👤 Sommer Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:53
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE PROCESS FOR THE LOW PRESSURE POLYMERIZATION OF AN OLEFIN IN A HYDROCARBON DILUENT CONTAINING A CATALYTIC AMOUNT OF A CATALYST COMPRISING AN ALKYL ALUMINUM COMPOUND AND A SALT OF A METAL OF SUBGROUPS IV TO VI OF THE PERIODIC TABLE, THE IMPROVEMENT COMPRISING REMOVING THE CATALYST RESIDUES FROM THE POLYOLEFIN BY ADDING AN ALKALINE COMPOUND TO THE SUSPENSION OF THE POLYOLEFIN IN SAID HYDROCARBON DILUENT, STIRRING THE RESULTING MIXTURE, AND THEN SEPARATING THE SOLID POLYOLEFIN FROM SAID MIXTURE.
Claim 2
Dependent Claim
79 words
THE PROCESS FOR THE LOW PRESSURE POLYMERIZATION OF AN OLEFIN IN A HYDROCARBON DILUENT CONTAINING A CATALYTIC AMOUNT OF A CATALYST COMPRISING AN ALKYL ALUMINUM COMPOUND AND A SALT OF A METAL OF SUBGROUPS IV TO VI OF THE PERIODIC TABLE, THE IMPROVEMENT COMPRISING REMOVING THE CATALYST RESIDUES FROM THE POLYOLEFIN BY ADDING AN ALKALINE COMPOUND TO THE SUSPENSION OF THE POLYOLEFIN IN SAID HYDROCARBON DILUENT, STIRRING THE RESULTING MIXTURE, AND THEN SEPARATING THE SOLID POLYOLEFIN FROM SAID MIXTURE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |