US2999891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removing alkali metal catalysts from polymers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1957-09-23
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Granted: 1961-09-12
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Expires: 1977-09-23
Abstract
No abstract record available.
Inventors
- 👤 Anthony H Gleason
- 👤 Ober C Slotterbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:07
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/02; C08C2/04; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A PROCESS FOR PREPARING A SUBSTANTIALLY ALKALI METAL FREE LIQUID POLYMER SOLUTION WHICH COMPRISES POLYMERIZING IN A POLYMERIZATION ZONE A REACTION MIXTURE CONTAINING MONOMERS COMPRISING ABOUT 80 TO 100 WEIGHT PERCENT OF A C4 TO C10 CONJUGATED DIOLEFIN AND ABOUT 0 TO 20 WEIGHT PERCENT OF A VINYL AROMATIC HYDROCARBON IN THE PRESENCE OF A FINELY DIVIDED ALKALI METAL CATALYST AND AN INERT DILUENT, WHEREBY A POLYMER-CONTAINING REACTION MIXTURE CONTAINING FINELY DIVIDED FREE ALKALI METAL AND INSOLUBLE ALKALI METAL-CONTAINING COMPOUNDS IS FORMED, SEPARATING OUT ABOUT 0-100% OF THE FREE ALKALI METAL AND INSOLUBLE ALKALI METAL-CONTAINING COMPOUNDS FROM THE REACTION MIXTURE AND CONTACTING THE RESULTING MIXTURE CONTAINING RESIDUAL ALKALI METAL AND ALKALI METAL COMPOUNDS AT A
References Cited (Backward Citations)
US2813136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |