US2924593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene using as a catalyst the product formed by mixing a bis(cyclopentadienyl) zirconium salt with an alkyl metallic compound
Assignee: Hercules Powder Co
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Filing: 1956-08-23
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Granted: 1960-02-09
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Expires: 1976-08-23
Abstract
No abstract record available.
Inventors
- 👤 David S Breslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:53
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE PROCESS OF POLYMERIZING ETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A CATALYST FORMED BY MIXING A BIS(CYCLOPENTADINEYL) ZIRCONIUM SALT, WHEREIN THE CYCLOPENTADIENYL MOIETY IS SELECTED FROM THE GROUP CONSISTING OF CYCLOPENTADIENYL AND ALKYLCYLOPENTADINEYL RADICALS, WITH AN ALKYL METALLIC COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS I-A, II-A AND III-A OF THE PERIODIC TABLE.
Claim 2
Dependent Claim
60 words
THE PROCESS OF POLYMERIZING ETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A CATALYST FORMED BY MIXING A BIS(CYCLOPENTADINEYL) ZIRCONIUM SALT, WHEREIN THE CYCLOPENTADIENYL MOIETY IS SELECTED FROM THE GROUP CONSISTING OF CYCLOPENTADIENYL AND ALKYLCYLOPENTADINEYL RADICALS, WITH AN ALKYL METALLIC COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS I-A, II-A AND III-A OF THE PERIODIC TABLE.
References Cited (Backward Citations)
BE533362A
Cited
US2827446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |