US2521444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of isomeric aromatic compounds
Assignee: California Research LLC
•
Filing: 1946-06-28
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Granted: 1950-09-05
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Expires: 1966-06-28
Abstract
No abstract record available.
Inventors
- 👤 Lloyd F Brooke
- 👤 Terrace Berkeley Highland
- 👤 Gordon E Langlois
- 👤 Arthur E Stickland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS OF TREATING A MIXTURE OF ISOMERIC LOWER DIALKYL BENZENES WHICH COMPRISES FEEDING SAID MIXTURE TO A LIQUID PHASE EXTRACTION ZONE, SELECTIVELY EXTRACTING A DIALKYL BENZENE COMPOSITION ISOMERIC TO THE MIXTURE OF DIALKYL BENZENES IN THE FEED BY CONTACTING SAID FEED WITH A LIQUID MIXTURE OF HF AND BF3 IN SAID EXTRACTION ZONE AT A TEMPERTURE NOT ABOVE 100*F., SEPARATING A LIQUID HF AND BF3 EXTRACT PHASE CONTAINING SE-
Claim 2
Dependent Claim
70 words
A PROCESS OF TREATING A MIXTURE OF ISOMERIC LOWER DIALKYL BENZENES WHICH COMPRISES FEEDING SAID MIXTURE TO A LIQUID PHASE EXTRACTION ZONE, SELECTIVELY EXTRACTING A DIALKYL BENZENE COMPOSITION ISOMERIC TO THE MIXTURE OF DIALKYL BENZENES IN THE FEED BY CONTACTING SAID FEED WITH A LIQUID MIXTURE OF HF AND BF3 IN SAID EXTRACTION ZONE AT A TEMPERTURE NOT ABOVE 100*F., SEPARATING A LIQUID HF AND BF3 EXTRACT PHASE CONTAINING SE-
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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |