US3686159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymerization
Assignee: Shell USA Inc
•
Filing: 1970-09-08
•
Granted: 1972-08-22
•
Expires: 1990-09-08
Abstract
Abstract ETHYLENE IS POLYMERIZED TO PRODUCTS OF HIGH LINEARITY IN THE PRESENCE OF A NICKEL COMPLEX OF STABLE PHOSPHORUS YLIDS CONTAINING A CONJUGATED CARBONYL-CONTAINING FUNCTIONAL GROUP OR A CONJUGATED CYCLIC RING AS A SECOND CHELATING SITE.
Inventors
- 👤 Ronald Bauer
- 👤 Harold Chung
- 👤 Kenneth W Barnett
- 👤 Peter W Glockner
- 👤 Wilhelm Keim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:45
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/904
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |