US3794628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tris(bicycloheptyl)chromium compounds and use as polymerization catalysts
Assignee: Hercules LLC
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Filing: 1972-06-21
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Granted: 1974-02-26
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Expires: 1992-06-21
Abstract
Abstract ORGANO TRIVALENT CHROMIUM COMPOUNDS ARE DESCRIBED WHEREIN THE CHROMIUM IS LINKED TO THE BRIDGEHEAD CARBONS OF THREE BICYCLIC RADICALS, NAMELY A 1-BICYCLO-(2.2.2)HEPTYL RADICAL THAT CONTAINS TWO METHYL GROUPS ATTACHED TO CARBONS ADJACENT TO BE BRIDGEHEAD CARBON, I.E., IN THE 2 AND/OR 6 POSITION. A TYPICAL COMPOUND IS TRIS-(4-CAMPHYL) CHROMIUM. THESE COMPOUNDS ARE USEFUL AS CATALYST FOR THE POLYMERIZATION OF 1-OLEFINS AND CAN BE USED ALONE OR IN COMBINATION WITH ORGANOMETALLIC ACTIVATORS SUCH AS ALKYLALUMINUM COMPOUNDS.
Inventors
- 👤 B Bower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:21
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/12; B01J31/14; B01J31/143; B01J31/122; C; C07; C07F; C07F11/00; C08; C08F; C08F10/00
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |