US2882264A
Expired / Lapsed
US
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Polymerization of ethylene
Assignee: Dow Chemical Co
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Filing: 1955-10-10
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Granted: 1959-04-14
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Expires: 1975-10-10
Abstract
No abstract record available.
Inventors
- 👤 Earle B Barnes
- 👤 John E Thomson
- 👤 Jr George A Klumb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:59
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F136/00; C08F136/02; C08F136/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
132 words
A METHOD WHICH COMPRISES POLYMERIZING A POLYMERIZABLE ALPHA-OLEFIN HAVING FROM 2 TO 4 CARBON ATOMS BY CONTACTING THE SAME WITH BETWEEN 25 AND 500 PARTS BY WEIGHT OF A COMPLEX ORGANO-METAL CATALYST PER MILLION PARTS OF SAID ALPHA-OLEFIN TO OBTAIN A HIGH MOLECULAR WEIGHT POLYMERIZED ALPHA-OLEFIN, WHEREIN THE COMPLEX ORGANO-METAL CATALYST IS OBATINED BY INTERACTING IN AN INERT LIQUID DILUENT FROM 0.4 TO 12 MOLE-WEIGHT OF AN ORGANO-METAL COMPOUND SELECTED FROM THE CLASS CONSISTING OF ORGANO-ALUMINUM, ORGANO-ZINC AND ORGANOMAGNESIUM COMPOUNDS AND A ONE MOLE-WEIGHT OF A METAL COMPOUND SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS OF THE METALS OF GROUPS IV-B, V-B AND VI-B OF THE PERIODIC SYSTEM, PARTICULARLY CHARACTERIZED BY CARRYING OUT THE POLYMERIZING AT A TEMPERATURE BETWEEN 175* AND 300* C. AND AT A PRESSURE OF AT LEAST 500 ATMOSPHERES.
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) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |