Patent US2907757A successfully refreshed from Google Patents.
US2907757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymerization catalysts
Assignee: EIDP Inc
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Filing: 1955-03-28
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Granted: 1959-10-06
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Expires: 1975-03-28
Abstract
No abstract record available.
Inventors
- 👤 Merckling Nicholas George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:50
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A POLYMERIZATION CATALYST COMPOSITION ESSENTIALLY CONSISTING OF THE PRODUCT OBTAINED ON ADMIXING IN THE PRESENCE OF AN INERT HYDROCARBON SOLVENT, A HALIDE OF THE CLASS CONSISTING OF YTTRIUM AND SCANDIUM HALIDES WITH A GRIGNARD REAGENT, THE RATIO OF SAID HALIDE TO SAID GRIGNARD REAGENT BEING FROM 0.5 TO 6.
Claim 2
Dependent Claim
49 words
A POLYMERIZATION CATALYST COMPOSITION ESSENTIALLY CONSISTING OF THE PRODUCT OBTAINED ON ADMIXING IN THE PRESENCE OF AN INERT HYDROCARBON SOLVENT, A HALIDE OF THE CLASS CONSISTING OF YTTRIUM AND SCANDIUM HALIDES WITH A GRIGNARD REAGENT, THE RATIO OF SAID HALIDE TO SAID GRIGNARD REAGENT BEING FROM 0.5 TO 6.
References Cited (Backward Citations)
US2475520A
Cited
US2721189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |