US2990399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: GELSENBERG BENZIN AG FA
•
Filing: 1956-04-16
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Granted: 1961-06-27
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Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 Peterlein Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:40
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08F255/00; C08F10/00; C08F10/02; Y; Y10; Y10S; Y10S526/00; Y10S526/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD OF POLYMERIZING ETHYLENE, COMPRISING THE STEPS OF SUBJECTING ETHYLENE TO POLYMERIZATION IN THE PRESENCE OF A POLYMERIZATION CATALYST THEREFOR INCLUDING AN ORGANIC ALUMINUM COMPOUND AND A HEAVY METAL COMPOUND AND A SOLVENT THEREFOR HAVING A BOILING POINT BELOW THE REACTION TEMPERATURE OF SAID POLYMERIZATION THE SAME THUS BEING CARRIED OUT UNDER BOILING OF SAID SOLVENT SO AS TO FORM A SOLID POLYMERIZED ETHYLENE PORTION SIMULTANEOUSLY EVAPORATING AT LEAST A PORTION OF SAID BOILING SOLVENT AND REMOVING THE SAME; RELIQUEFYING SAID REMOVED VAPORIZED SOLVENT THEREBY FORMING A PURE RELIQUEFIED SOLVENT; REINTRODUCING AT LEAST A PORTION OF SAID PURE RELIQUEFIED SOLVENT; AND POLYMERIZING ADDITIONAL ETHYLENE IN THE PRESENCE OF SAID POLYMERIZATION CATALYST AND OF SAID REINTRODUCED SOLVENT.
Claim 2
Independent Claim
117 words
A METHOD OF POLYMERIZING ETHYLENE, COMPRISING THE STEPS OF SUBJECTING ETHYLENE TO POLYMERIZATION IN THE PRESENCE OF A POLYMERIZATION CATALYST THEREFOR INCLUDING AN ORGANIC ALUMINUM COMPOUND AND A HEAVY METAL COMPOUND AND A SOLVENT THEREFOR HAVING A BOILING POINT BELOW THE REACTION TEMPERATURE OF SAID POLYMERIZATION THE SAME THUS BEING CARRIED OUT UNDER BOILING OF SAID SOLVENT SO AS TO FORM A SOLID POLYMERIZED ETHYLENE PORTION SIMULTANEOUSLY EVAPORATING AT LEAST A PORTION OF SAID BOILING SOLVENT AND REMOVING THE SAME; RELIQUEFYING SAID REMOVED VAPORIZED SOLVENT THEREBY FORMING A PURE RELIQUEFIED SOLVENT; REINTRODUCING AT LEAST A PORTION OF SAID PURE RELIQUEFIED SOLVENT; AND POLYMERIZING ADDITIONAL ETHYLENE IN THE PRESENCE OF SAID POLYMERIZATION CATALYST AND OF SAID REINTRODUCED SOLVENT.
References Cited (Backward Citations)
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US2484384A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |