Patent US3737475A successfully refreshed from Google Patents.
US3737475A
Expired / Lapsed
US
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Alpha-olefin production
Assignee: Shell USA Inc
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Filing: 1972-08-17
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Granted: 1973-06-05
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Expires: 1992-08-17
Abstract
Abstract ETHYLENE IS OLIGOMERIZED TO LINEAR, ALPHA-OLEFINS BY REACTING ETHYLENE IN A C2-C4 VIC-ALKANEDIOL SOLUTION IN THE PRESENCE OF A CATALYST COMPOSITION PRODUCED BY CONTACTING IN THE PRESENCE OF ETHYLENE (1) A SIMPLE DIVALENT NICKEL SALT (2) A BORON HYDRIDE REDUCING AGENT AND (3) DICYCLOHEXYLPHOSPHINOPROPIONIC ACID OR ALKALI METAL SALT THEREOF.
Inventors
- 👤 R Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:10
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/36; C07C11/00; C07C11/02; C07C2527/00; C07C2527/06; C07C2527/128; C07C2531/00; C07C2531/02; C07C2531/04; C07C2531/12; C07C2531/14; C07C2531/16; C07C2531/24
Claims Analysis
Total Claims: 0
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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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |