US3801520A
Expired / Lapsed
US
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Carbon dioxide and water treatment of coupled lithium initiated polymer
Assignee: Phillips Petroleum Co
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Filing: 1972-01-21
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Granted: 1974-04-02
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Expires: 1992-01-21
Abstract
Abstract THE EFFLUENT FROM A LITHIUM INITIATED POLYMERIZATION, WHEREIN A COUPLING AGENT IS UTILIZED TO JOIN TWO OR MORE POLYMER MOLECULES TOGETHER, WITH THE RESULTING GENERATION OF LIO-, LIS-, OR LI-NH- GROUPS IS TREATED WITH CARBON DIOXIDE AND WATER TO IMPROVE THE COLOR AND MAINTAIN LOW HAZE OF THE RESULTING POLYMER.
Inventors
- 👤 G Kahle
- 👤 J Hogan
- 👤 A Kitchen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:41
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |