Patent US2914520A successfully refreshed from Google Patents.
US2914520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene with a catalyst of alkyl aluminum and a group iii-a metalsalt
Assignee: Hercules Powder Co
•
Filing: 1957-03-19
•
Granted: 1959-11-24
•
Expires: 1977-03-19
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Vandenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:26
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE PROCESS FOR THE POLYMERIZATION OF ETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A CATALYST FORMED BY MIXING AN ALKYLALUMINUM COMPOUND WITH A SALT OF A METAL OF GROUP III-A OF THE PERIODIC TABLE HAVING AN ATOMIC NUMBER GREATER THAN 13, AND RECOVERING A POLYMER OF ETHYLENE.
Claim 2
Dependent Claim
46 words
THE PROCESS FOR THE POLYMERIZATION OF ETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A CATALYST FORMED BY MIXING AN ALKYLALUMINUM COMPOUND WITH A SALT OF A METAL OF GROUP III-A OF THE PERIODIC TABLE HAVING AN ATOMIC NUMBER GREATER THAN 13, AND RECOVERING A POLYMER OF ETHYLENE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |