US2952683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of alkali metal impurities from liquid diene polymers
Assignee: Phillips Petroleum Co
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Filing: 1958-10-30
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Granted: 1960-09-13
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Expires: 1978-10-30
Abstract
No abstract record available.
Inventors
- 👤 Paul F Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:58
CPC Classifications
C; C08; C08C; C08C4/00; C07; C07C; C07C7/00; C07C7/005; C07C7/148; C07C7/14858; C07C7/14875; C07C7/14891; C08C2/00; C08C2/02; C08C2/04; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/945
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A METHOD FOR TREATING A LIQUID POLYMER PRODUCED BY POLYMERIZATION OF A CONJUGATED DIENE IN THE PRESENCE OF AN ALKALI METAL CATALYST AND WHICH CONTAINS ALKALI METAL AS AN IMPURITY, WHICH COMPRISES TREATING SAID LIQUID POLYMER IN THE ABSENCE OF WATER WITH AN ALCOHOL AND THEREAFTER CARGON DIOXIDE, AND REMOVING THE RESULTING PRECIPITATE FROM SAID LIQUID POLYMER.
Claim 2
Independent Claim
57 words
A METHOD FOR TREATING A LIQUID POLYMER PRODUCED BY POLYMERIZATION OF A CONJUGATED DIENE IN THE PRESENCE OF AN ALKALI METAL CATALYST AND WHICH CONTAINS ALKALI METAL AS AN IMPURITY, WHICH COMPRISES TREATING SAID LIQUID POLYMER IN THE ABSENCE OF WATER WITH AN ALCOHOL AND THEREAFTER CARGON DIOXIDE, AND REMOVING THE RESULTING PRECIPITATE FROM SAID LIQUID POLYMER.
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) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |