US3661882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization catalyst derived from zero-valent state metal coordination complex with group v-a compound etc.
Assignee: Columbian Carbon Co
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Filing: 1969-09-05
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Granted: 1972-05-09
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Expires: 1989-09-05
Abstract
Abstract A CATALYST COMOPOSITION IS PROVIDED WHICH CONTAINS A COORDINATION COMPLEX OF A GROUP V-A COMPOUND SUCH AS TRIPHENYL PHOSPHITE AND A GROUP ZERO-VALENT STATE METAL SUCH AS NICKEL, FOR EXAMPLE, TETRAKIS(TRIPHENYLPHOSPHITE) NICKEL (O) OR BIS(TRIPHENYLPHOSPHITE) NICKEL (O) DICARBONYL, TOGETHER WITH AN INORGANIC LEWIS ACID SUCH AS ALUMINUM CHLORIDE, BORON TRIFLUORIDE, OR ZINC CHLORIDE, SUITABLY WITH A SOLVENT SUCH AS TETRAHYDROFURAN, CYCLOHEXANE, OR METHYL CHLORIDE, WHICH CATALYST IS USED TO POLYMERIZE AN UNSATURATED MONOMER SUCH AS BUTADIENE.
Inventors
- 👤 John J Hawkins
- 👤 Charles D Storrs
- 👤 Stanley D Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:29
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/06; C08F36/00; C08F36/02; C08F36/04; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
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) | 1975-05-09 | 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 |