US2838477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of highly polymerized hydrocarbons
Assignee: Ruhrchemie AG
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Filing: 1955-03-29
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Granted: 1958-06-10
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Expires: 1975-03-29
Abstract
No abstract record available.
Inventors
- 👤 Roelen Otto
- 👤 Kolling Helmut
- 👤 Geiser Nikolaus
- 👤 Stiebling Ewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:33
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS FOR THE PURIFICATION OF HIGHLY POLYMERIZED OLEFINS OF THE TYPE COMPRISING ETHYLENE AND ITS HOMOLOGUES IN THE PRESENCE OF ORGANIC SOLVENTS AND OF CATALYSTS CONSISTING OF A MIXTURE OF ALUMINUM ALKYL COMPOUNDS WITH A COMPOUND SELECTED FROM THE GROUP OF TITANIUM TETRACHLORIDE, ZIRCRONIUM ACETYL-ACETONATE, AND THORIUM ACETYL ACETONATE AT TEMPERATURES FROM 20-100* C. AND PRESSURES UP TO 100 ATM., THE STEPS COMPRISING FIRST MECHANICALLY SEPARATING THE BULK OF THE SOLVENT FROM THE POLYMER PRODUCT, SUSPENDING THE POLYMERIZED MASS IN WATER TO WHICH AN ALKALINE AGENT HAS BEEN ADDED, AND THEREAFTER SUBJECTING THE SUSPENDED POLYMER TO A TREATMENT WITH STEAM.
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR THE PURIFICATION OF HIGHLY POLYMERIZED OLEFINS OF THE TYPE COMPRISING ETHYLENE AND ITS HOMOLOGUES IN THE PRESENCE OF ORGANIC SOLVENTS AND OF CATALYSTS CONSISTING OF A MIXTURE OF ALUMINUM ALKYL COMPOUNDS WITH A COMPOUND SELECTED FROM THE GROUP OF TITANIUM TETRACHLORIDE, ZIRCRONIUM ACETYL-ACETONATE, AND THORIUM ACETYL ACETONATE AT TEMPERATURES FROM 20-100* C. AND PRESSURES UP TO 100 ATM., THE STEPS COMPRISING FIRST MECHANICALLY SEPARATING THE BULK OF THE SOLVENT FROM THE POLYMER PRODUCT, SUSPENDING THE POLYMERIZED MASS IN WATER TO WHICH AN ALKALINE AGENT HAS BEEN ADDED, AND THEREAFTER SUBJECTING THE SUSPENDED POLYMER TO A TREATMENT WITH STEAM.
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |