Patent US2845467A successfully refreshed from Google Patents.
US2845467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating polymers produced by alkali-metal catalyzed polymerizations with acidic cationic exchange resins
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-12-21
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Granted: 1958-07-29
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Expires: 1974-12-21
Abstract
No abstract record available.
Inventors
- 👤 Mertzweiller Joseph Kern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:32
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/02; C08C2/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
IN A PROCESS FOR THE TREATMENT OF A LIQUID COPOLYMER PRODUCED BY SOLUTION POLYMERIZATION OF 1,3-BUTADIENE AND STYRENE IN THE PRESENCE OF AN ALKALI METAL CATALYST AND IN WHICH A RESULTING COPOLYMER SOLUTION IS OBTAINED WHICH CONTAINS ALKALI METAL AND ORGANO-ALKALI METAL COMPOUNDS AS IMPURITIES, THE IMPROVEMENT WHICH COMPRISES TREATING THE RESULTING LIQUID POLYMER SOLUTION TO SEPARATE THE ALKALI METAL AND THEN CONTACTING THE RESULTING ALKALI METALFREE SOLUTION WITH AN ACIDIC CATIONIC EXCHANGE RESIN TO EFFECT EXCHANGE OF THE ALKALI METAL IN THE ORGANO-ALKALI METAL COMPOUND WITH THE HYDROGEN IN THE RESIN.
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) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |