US3148224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of conjugated diolefins using nickel complexes and metal hydrides as catalyst
Assignee: Wyeth Holdings LLC
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Filing: 1961-07-24
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Granted: 1964-09-08
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Expires: 1981-07-24
Abstract
No abstract record available.
Inventors
- 👤 Lionel B Luttinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:38
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS FOR PRODUCING LOW MOLECULAR WEIGHT OLIGOMERS OF BUTADIENE COMPRISING HEATING SAID BUTADIENE AT A TEMPERATURE BETWEEN ABOUT 100*C., AND 175*C. IN THE PRESENCE OF A CATALYST COMPOSITION COMPRISING A MIXTURE OF (1) A TRANSITION METAL COMPLEX HAVING THE FORMULA:
Claim 2
Dependent Claim
41 words
A PROCESS FOR PRODUCING LOW MOLECULAR WEIGHT OLIGOMERS OF BUTADIENE COMPRISING HEATING SAID BUTADIENE AT A TEMPERATURE BETWEEN ABOUT 100*C., AND 175*C. IN THE PRESENCE OF A CATALYST COMPOSITION COMPRISING A MIXTURE OF (1) A TRANSITION METAL COMPLEX HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |