US2727078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xylenes concentration process
Assignee: Standard Oil Co
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Filing: 1952-09-13
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Granted: 1955-12-13
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Expires: 1972-09-13
Abstract
No abstract record available.
Inventors
- 👤 Bernard H Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:41
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A PROCESS FOR THE SELECTIVE SEPARATION OF METAXYLENE FROM A HYDROCARBON STOCK WHOSE AROMATIC COMPONENTS COMPRISES ESSENTIALLY META-XYLENE AND AT LEAST ONE ISOMERIC XYLENE, WHICH PROCESS COMPRISES THE STEP OF FORMING A SOLUTION COMPRISING COMPLEXES OF META-XYLENE AND AT LEAST ONE ISOMERIC XYLENE WITH LIQUID HYDROGEN FLUORIDE AND BF3, THE IMPROVEMENT WHICH COMPRISES INTRODUCING INTO SAID SOLUTION A META-XYLENE STREAM WITHOUT ANY SUBSTANTIAL ACCOMPANIMENT OF BF3, SIMULTANEOUSLY INTRODUCING INTO SAID SOLUTION A COUNTERSOLVENT, THEREBY SELECTIVELY LIBERATING SAID ISOMERIC XYLENE FROM ITS COMPLEX WITH HYDROGEN FLUORIDE AND BF3 AND EFFECTING THE DISPLACEMENT OF THE ISOMERIC XYLENE THUS LIBERATED INTO
Claim 2
Dependent Claim
99 words
IN A PROCESS FOR THE SELECTIVE SEPARATION OF METAXYLENE FROM A HYDROCARBON STOCK WHOSE AROMATIC COMPONENTS COMPRISES ESSENTIALLY META-XYLENE AND AT LEAST ONE ISOMERIC XYLENE, WHICH PROCESS COMPRISES THE STEP OF FORMING A SOLUTION COMPRISING COMPLEXES OF META-XYLENE AND AT LEAST ONE ISOMERIC XYLENE WITH LIQUID HYDROGEN FLUORIDE AND BF3, THE IMPROVEMENT WHICH COMPRISES INTRODUCING INTO SAID SOLUTION A META-XYLENE STREAM WITHOUT ANY SUBSTANTIAL ACCOMPANIMENT OF BF3, SIMULTANEOUSLY INTRODUCING INTO SAID SOLUTION A COUNTERSOLVENT, THEREBY SELECTIVELY LIBERATING SAID ISOMERIC XYLENE FROM ITS COMPLEX WITH HYDROGEN FLUORIDE AND BF3 AND EFFECTING THE DISPLACEMENT OF THE ISOMERIC XYLENE THUS LIBERATED INTO
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) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |