US2965625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of polymerizing a conjugated diene
Assignee: Shell USA Inc
•
Filing: 1958-01-27
•
Granted: 1960-12-20
•
Expires: 1978-01-27
Abstract
No abstract record available.
Inventors
- 👤 William S Anderson
- 👤 Lee M Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
THE PROCESS COMPRISING POLYMERIZING A CONJUGATED DIENE IN THE PRESENCE OF A CATALYST OF AN ALKYL LITHIUM AND A METAL SALT SELECTED FROM THE GROUP CONSISTING OF COBALTOUS CHLORIDE, COBALTOUS NITRATE, NICKELOUS CHLORIDE AND NICKELOUS NITRATE, THE POLYMERIZATION BEING CONDUCTED IN THE PRESENCE OF AN ETHER, THE MOLE RATIO OF THE METAL HALIDE TO THE ALKYL LITHIUM RANGING FROM ABOUT 1.5:1 TO ABOUT 5:1, THE ETHER BEING PRESENT IN AN AMOUNT FROM ABOUT 0.5 GRAM TO ABOUT 300 GRAMS PER MILLIMOLE OF THE METAL SALT AND THE POLYMERIZATION TEMPERATURE RANGING FROM ABOUT 20 TO ABOUT 100*C.
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Cited
US2905659A
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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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |