Patent US2879263A successfully refreshed from Google Patents.
US2879263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: EIDP Inc
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Filing: 1955-02-01
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Granted: 1959-03-24
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Expires: 1975-02-01
Abstract
No abstract record available.
Inventors
- 👤 Anderson Arthur William
- 👤 Bro Manville Isager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:45
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE PROCESS FOR PREPARING A HOMOPOLYMER OF ETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A POLYMERIZATION INITIATOR IN AN INERT, LIQUID HYDROCARBON MEDIUM AT A TEMPERATURE BELOW 150* C., SAID INITIATOR CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OBTAINED ON ADMIXING A METAL HALIDE OF THE CLASS CONSISTING OF TITANIUM HALIDES AND ZIRCONIUM HALIDES, SAID HALDES BEING SELECTED FROM THE GROUP CONSISTING OF BROMIDES AND CHLORIDES, WITH AN ALKALI METAL AND A MEMBER OF THE CLASS CONSISTING OF HYDROCARBONS HAVING A TRIPLE BOND BETWEEN CARBON ATOMS AND HYDROCARBONS OF MOLECULAR WEIGHT HIGHER THAN ETHYLENE, HAVING AT LEAST ONE NONBENZENOID ETHYLENIC BOND, SAID ALKALI METAL BEING PRESENT IN SUFFICIENT QUANTITIES TO REDUCE THE METAL OF SAID METAL HALIDE TO A VALENCE STATE BELOW THREE AND SAID HYDROCARBON BEING PRESENT IN AT LEAST EQUIMOLAR QUANTITIES OF SAID ALKALI METAL, AND RECOVERING A SOLID POLYMER OF ETHYLENE.
Claim 2
Dependent Claim
142 words
THE PROCESS FOR PREPARING A HOMOPOLYMER OF ETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A POLYMERIZATION INITIATOR IN AN INERT, LIQUID HYDROCARBON MEDIUM AT A TEMPERATURE BELOW 150* C., SAID INITIATOR CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OBTAINED ON ADMIXING A METAL HALIDE OF THE CLASS CONSISTING OF TITANIUM HALIDES AND ZIRCONIUM HALIDES, SAID HALDES BEING SELECTED FROM THE GROUP CONSISTING OF BROMIDES AND CHLORIDES, WITH AN ALKALI METAL AND A MEMBER OF THE CLASS CONSISTING OF HYDROCARBONS HAVING A TRIPLE BOND BETWEEN CARBON ATOMS AND HYDROCARBONS OF MOLECULAR WEIGHT HIGHER THAN ETHYLENE, HAVING AT LEAST ONE NONBENZENOID ETHYLENIC BOND, SAID ALKALI METAL BEING PRESENT IN SUFFICIENT QUANTITIES TO REDUCE THE METAL OF SAID METAL HALIDE TO A VALENCE STATE BELOW THREE AND SAID HYDROCARBON BEING PRESENT IN AT LEAST EQUIMOLAR QUANTITIES OF SAID ALKALI METAL, AND RECOVERING A SOLID POLYMER OF ETHYLENE.
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) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |