US2956050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymerization process and catalyst therefor
Assignee: WR Grace and Co
•
Filing: 1959-01-13
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Granted: 1960-10-11
•
Expires: 1979-01-13
Abstract
No abstract record available.
Inventors
- 👤 Calvin J Benning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/903; Y10S526/906; Y10S526/907
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
43 words
THE METHOD OF FORMING AN ACTIVE TICI2 CATALYST FOR ETHYLENE POLYMERIZATION WHICH COMPRISES GRINDING TICI3 IN A MEDIUM CONSISTING ESSENTIALLY OF GASEOUS ETHYLENE AT A SUPERATMOSPHERIC PRESSURE UP TO SUBSTANTIALLY 50 P.S.I. UNTIL THE TICL2 HAS ADSORBED SUBSTNATIALLY 3.5% BY WEIGHT OF ETHYLENE.
Claim 2
Independent Claim
43 words
THE METHOD OF FORMING AN ACTIVE TICI2 CATALYST FOR ETHYLENE POLYMERIZATION WHICH COMPRISES GRINDING TICI3 IN A MEDIUM CONSISTING ESSENTIALLY OF GASEOUS ETHYLENE AT A SUPERATMOSPHERIC PRESSURE UP TO SUBSTANTIALLY 50 P.S.I. UNTIL THE TICL2 HAS ADSORBED SUBSTNATIALLY 3.5% BY WEIGHT OF ETHYLENE.
Claim 3
Independent Claim
49 words
THE METHOD OF FORMING SOLID POLYETHYLENE WHICH COMPRISES SUBJECTING ETHYLENE TO THE ACTION OF A TICL2 CATALYST PREPARED BY GRINDING TICL2 IN A MEDIUM CONSISTING ESSENTIALLY OF GASEOUS ETHYLENE AT A SUPERATMOSPHERIC PRESSURE UP TO SUBSTANTIALLY 50 P.S.I. UNTIL THE TICL2 HAS ADSORBED SUBSTANTIALLY 3.5% BY WEIGHT OF ETHYLENE.
Claim 4
Independent Claim
49 words
THE METHOD OF FORMING SOLID POLYETHYLENE WHICH COMPRISES SUBJECTING ETHYLENE TO THE ACTION OF A TICL2 CATALYST PREPARED BY GRINDING TICL2 IN A MEDIUM CONSISTING ESSENTIALLY OF GASEOUS ETHYLENE AT A SUPERATMOSPHERIC PRESSURE UP TO SUBSTANTIALLY 50 P.S.I. UNTIL THE TICL2 HAS ADSORBED SUBSTANTIALLY 3.5% BY WEIGHT OF ETHYLENE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |