US3699055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triarylphosphine,alkyllithium,and 1,3-dihalobenzene polymerization initiator for conjugated diene polymerization
Assignee: Phillips Petroleum Co
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Filing: 1971-07-19
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Granted: 1972-10-17
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Expires: 1991-07-19
Abstract
Abstract A METHOD OF MANUFACTURING HIGH CIS-POLYDIENES BY POLYMERIZING A CONJUGATED DIENE WITH AN INITIATOR PREPARED BY REACTING A TRIARYLPHOSPHINE, AN ALKYLITHIUM AND A 1,3DI-HALOBENZENE.
Inventors
- 👤 William J Trepka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:23
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |