US2666796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining of tar acid oil
Assignee: Consolidation Coal Co
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Filing: 1950-09-12
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Granted: 1954-01-19
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Expires: 1970-09-12
Abstract
No abstract record available.
Inventors
- 👤 Gorin Everett
- 👤 Martin B Neuworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/005; C07C37/008; C10; C10C; C10C1/00; C10C1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR SEPARATING TAR ACIDS FROM A TAR ACID OIL FRACTION WHICH COMPRISES THE STEPS OF FEEDING SAID TAR ACID OIL TO A VERTICAL EXTRACTION ZONE AT A POINT LOCATED BETWEEN THE ENDS THEREOF, FEEDING AN AQUEOUS METHANOL SOLUTION CONTAINING 55 TO 75 WEIGHT PER CENT METHANOL AND THE BALANCE WATER TO THE TOP OF SAID EXTRACTION ZONE, FEEDING A SECOND SOLVENT CONSISTING OF A PARAFFINIC NAPHHTHA FRACTION BOILING WITHIN THE
Claim 2
Dependent Claim
72 words
A PROCESS FOR SEPARATING TAR ACIDS FROM A TAR ACID OIL FRACTION WHICH COMPRISES THE STEPS OF FEEDING SAID TAR ACID OIL TO A VERTICAL EXTRACTION ZONE AT A POINT LOCATED BETWEEN THE ENDS THEREOF, FEEDING AN AQUEOUS METHANOL SOLUTION CONTAINING 55 TO 75 WEIGHT PER CENT METHANOL AND THE BALANCE WATER TO THE TOP OF SAID EXTRACTION ZONE, FEEDING A SECOND SOLVENT CONSISTING OF A PARAFFINIC NAPHHTHA FRACTION BOILING WITHIN THE
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |