Patent US2977346A successfully refreshed from Google Patents.
US2977346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aromatic-containing resins
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1957-07-23
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Granted: 1961-03-28
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Expires: 1977-07-23
Abstract
No abstract record available.
Inventors
- 👤 Cull Neville Leverne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:04
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
IN A PROCESS FOR POLYMERIZING A MIXTURE OF ISOBUTYLENE, STYRENE AND BUTADIENE BY CONTACT WITH BOROM FLUORIDE AT A TEMPERATURE BETWEEN 0*C. AND -150*C. WHEREBY A POLYMER IS OBTAINED WHICH CONTAINS A SMALL AMOUNT OF MONOMERIC STYRENE DISSOLVED THEREIN, THE METHOD OF REMOVING SAID MONOMERIC STYRENE WHICH COMPRISES DISSOLVING SAID POLYMER IN A PARAFFINIC HYDROCARBON SOLVENT AND CONTACTING SAID SOLUTION WITH A CRYSTALLINE METALLIC ALUMINO-SILICATE WHICH HAS BEEN HEATED TO REMOVE THE WATER OF HYDRATION AND WHICH HAS A UNIFORM PORE SIZE OF 13-14 ANGSTROMS.
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |