Patent US2921059A successfully refreshed from Google Patents.
US2921059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density polyethylene manufacture
Assignee: —
•
Filing: 1956-06-12
•
Granted: 1960-01-12
•
Expires: 1976-06-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:33
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE METHOD WHICH COMPRISES POLYMRIZING ETHYLENE TO SOLID POLYMER HAVING A DENSITY SUBSTANTIALLY HIGHER THAN OBTAINED UNDER THE SAME CONDITION BUT IN THE ABSENCE OF PARAFFINIC HYDROCARBON, SAID METHOD COMPRISING POLYMERIZING ETHYLENE AT A PRESSURE OF 15,000-O0,000 P.S.I. AND A TEMPERATURE OF 80-180*C. IN THE PRESENCE OF AN ETHYLENE POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF ORGANIC PEROXIDES AND AZO COMPOUNDS AND IN THE PRESENCE OF FROM 5-50% BY WEIGHT BASED ON THE WEIGHT OF SAID ETHYLENE OF A PARAFFINIC HYDROCARBON OF THE GROUP CONSISTING OF N-PROPANE, ISOBUTANE, N-HEXANE AND N-HEPTANE, AND IN THE ABSENCE OF ANY OTHER-DILUENT OR SOLVENT.
Claim 2
Independent Claim
101 words
THE METHOD WHICH COMPRISES POLYMRIZING ETHYLENE TO SOLID POLYMER HAVING A DENSITY SUBSTANTIALLY HIGHER THAN OBTAINED UNDER THE SAME CONDITION BUT IN THE ABSENCE OF PARAFFINIC HYDROCARBON, SAID METHOD COMPRISING POLYMERIZING ETHYLENE AT A PRESSURE OF 15,000-O0,000 P.S.I. AND A TEMPERATURE OF 80-180*C. IN THE PRESENCE OF AN ETHYLENE POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF ORGANIC PEROXIDES AND AZO COMPOUNDS AND IN THE PRESENCE OF FROM 5-50% BY WEIGHT BASED ON THE WEIGHT OF SAID ETHYLENE OF A PARAFFINIC HYDROCARBON OF THE GROUP CONSISTING OF N-PROPANE, ISOBUTANE, N-HEXANE AND N-HEPTANE, AND IN THE ABSENCE OF ANY OTHER-DILUENT OR SOLVENT.
References Cited (Backward Citations)
CA502597A
Cited
US2568902A
Cited
US2692261A
Cited
US2691647A
Cited
US2767160A
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US2820779A
Cited
US2816833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |