US2766296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of tar acids
Assignee: Consolidation Coal Co
•
Filing: 1953-11-27
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Granted: 1956-10-09
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Expires: 1973-11-27
Abstract
No abstract record available.
Inventors
- 👤 Benjamin W Jones
- 👤 Martin B Neuworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:57
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/005; C07C37/008; C07C37/006; C07C37/68; C07C37/70; C07C37/72; C10; C10C; C10C1/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
A METHOD FOR RECOVERING TAR ACIDS FROM TAR ACID OIL BOILING IN THE RANGE 160 TO 240* C. WHICH COMPRISES SEPARATING THE TAR ACID OIL INTO TWO DISTILLATE FRACTIONS, THE FIRST HAVING AN END BOILING POINT IN THE RANGE 180 TO 200* C. AND THE SECOND DISTILLATE FRACTION HAVING AN INITIAL BOILING POINT IN THE RANGE 180 TO 200* C., TREATING THE LOW BOILING FRACTION IN A FIRST COUNTERCURRENT, CENTER-FEED, DOUBLE SOLVENT EXTRACTION SYSTEM USING 40 TO 55 PERCENT AQUEOSU METHANOL AND PARAFFINIC NAPHTHA HAVING A DENSITY LESS THAN 0.8 AS SOLVENTS, TREATING THE HIGHER BOILING FRACTION IN A SECOND COUNTERCURRENT, CENTER-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |