US3661803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymerization in the presence of complex nickel catalysts containing a glycolic acid,thiogly colic,or thtolactic acid ligand
Assignee: Shell USA Inc
•
Filing: 1970-01-15
•
Granted: 1972-05-09
•
Expires: 1990-01-15
Abstract
Abstract ETHYLENE IS POLYMERIZED IN THE PRESENCE OF A CATALYST WHICH IS THE REACTION PRODUCT OF A NICKEL COMPOUND WITH A LIGAND SELECTED FROM THE GROUP CONSISTING OF GLYCOLIC ACID, THIOGLYCOLIC ACID AND THIOLACTIC ACID. THE NICKEL COMPOUNDS COMPRISE OLEFINICALLY UNSATURATED COMPOUNDS OF FROM 2 TO 20 CARBON ATOMS. THE PREFERRED NICKEL COMPOUND IS BISCYCLOOCTADIENE-1,5-NICKEL.
Inventors
- 👤 Ronald Bauer
- 👤 Harold Chung
- 👤 Wilhelm Keim
- 👤 Henry Van Zwet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:42
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |