US3705916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetra(bicycloheptyl) transition metal compounds
Assignee: Hercules LLC
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Filing: 1971-02-02
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Granted: 1972-12-12
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Expires: 1991-02-02
Abstract
Abstract TETRAVALENT ORGANOMETALLIC COMPOUNDS OF TRANSITION METALS ARE DESCRIBED WHEREIN THE METAL IS ATTACHED TO THE BRIDGE-HEAD CARBON OF FOUR BICYCLIC RADICALS, NAMELY, A 1-BICYCLO-(2-2-1)-HEPTYL RADICAL THAT CONTAINS NOT MORE THAN ONE METHYL GROUP ON A CARBON ADJACENT TO THE BRIDGEHEAD CARBON. TYPICAL COMPOUNDS ARE TETRKIS(1-NORBORNYL)TITANIUM AND THE CORRESPONDING ZIRCONIUM, HAFNIUM, VANADIUM, CHROMIUM, MANGANESE, IRON AND COBALT COMPOUNDS. THESE ORGANOMETALLIC COMPOUNDS HAVE MANY USES INCLUDING THEIR USE AS CATALYSTS FOR THE POLYMERIZATION OF VINYL MONOMERS.
Inventors
- 👤 Barton K Bower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:49
CPC Classifications
C; C07; C07F; C07F15/00; C07F15/06; C07F1/00; C07F1/02; C07F11/00; C07F13/00; C07F15/02; C07F7/00; C07F7/28; C08; C08F; C08F283/00; C08F283/01; C08F110/00; C08F110/02; C08F110/04; C08F110/06
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |