Patent US2965627A successfully refreshed from Google Patents.
US2965627A
Expired / Lapsed
US
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Ethylene polymerization process
Assignee: Standard Oil Co
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Filing: 1956-03-28
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Granted: 1960-12-20
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Expires: 1976-03-28
Abstract
No abstract record available.
Inventors
- 👤 Field Edmund
- 👤 Omar O Juveland
- 👤 Herbert N Friedlander
- 👤 Frank L Pilar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:50
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
IN A PROCESS FOR THE PREPARATION OF A NORMALLY SOLID POLYMER WHICH COMPRISES CONTACTING ETHYLENE UNDER POLYMERIZATION CONDITIONS WITH A POLYMERIZATION CATALYST PREPARED BY ADMIXING AN ALKALI METAL WITH TITANIUM TETRACHLIORIDE, THE IMPROVEMENT OF EFFECTING SAID CONTACTING IN THE PRESENCE OF A CARBOXYLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC MONOCARBOXYLIC ACIDS HAVING FROM 2 TO AOBUT 18 CARBONS ATOMS IN THE MOLECULE AND ALKYL ESTERS OF MONOCARBOXYLIC ACIDS HAVING FROM 2 TO ABOUT 12 CARBON ATOMS IN THE MOLECULE, THE PROPORTION OF SAID CARBOXYLIC COMPOUND BEING BETWEEN ABOUT 0.01 AND ABOUT 20% BY WEIGHT BASED ON THE WEIGHT OF ALKALI METAL, AND SEPARATING A SOLID POLYMER THUS PRODUCED.
References Cited (Backward Citations)
US2772317A
Cited
US2691647A
Cited
BE538782A
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US2845412A
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US2827445A
Cited
US2843577A
Cited
US2824090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |