Patent US2900373A successfully refreshed from Google Patents.
US2900373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymerization process
Assignee: Beazer East Inc
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Filing: 1956-03-13
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Granted: 1959-08-18
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Expires: 1976-03-13
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:02
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN THE PROCESS OF PRODUCING A NON-CORROSIVE HIGH MOLECULAR WEIGHT SOLID POLYMER OF POLYETHYLENE BY POLYMERIZING ETHYLENE IN THE PRESENCE OF A CATALYST IN AN INERT SOLVENT, SAID CATALYST COMPRISING A MIXTURE OF AN ALKYL ALUMINUM HALIDE AND TITANIUM TETRACHLORIDE, THE IMPROVEMENT WHICH COMPRISES TREATING THE POLYMER-CATALYST SLURRY RESULTING FROM THE REACTION WITH A LOWER ALIPHATIC ALCOHOL, FILTERING THE SLURRY TO OBTAIN SAID SOLID POLYMER, REFLUXING THE SEPARATED POLYMER WITH AN ALKALINE METAL ALKOXIDE OF A LOWER ALIPHATIC ALCOHOL, FILTERING AND SUBSEQUENTLY WASHING THE POLYMER WITH A LOWER ALIPHATIC ALCOHOL.
Claim 2
Dependent Claim
90 words
IN THE PROCESS OF PRODUCING A NON-CORROSIVE HIGH MOLECULAR WEIGHT SOLID POLYMER OF POLYETHYLENE BY POLYMERIZING ETHYLENE IN THE PRESENCE OF A CATALYST IN AN INERT SOLVENT, SAID CATALYST COMPRISING A MIXTURE OF AN ALKYL ALUMINUM HALIDE AND TITANIUM TETRACHLORIDE, THE IMPROVEMENT WHICH COMPRISES TREATING THE POLYMER-CATALYST SLURRY RESULTING FROM THE REACTION WITH A LOWER ALIPHATIC ALCOHOL, FILTERING THE SLURRY TO OBTAIN SAID SOLID POLYMER, REFLUXING THE SEPARATED POLYMER WITH AN ALKALINE METAL ALKOXIDE OF A LOWER ALIPHATIC ALCOHOL, FILTERING AND SUBSEQUENTLY WASHING THE POLYMER WITH A LOWER ALIPHATIC ALCOHOL.
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) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |