US2676912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-sludge separation
Assignee: Standard Oil Development Co
•
Filing: 1952-10-22
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Granted: 1954-04-27
•
Expires: 1972-10-22
Abstract
No abstract record available.
Inventors
- 👤 Daniel S Maisel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:37
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A PROCESS OF PURIFYING PHENOL CONTAINED IN A FEED MIXTURE WITH SLUDGE MATERIALS COMPRISING C5-C7 OLEFIN AND DIOLEFIN REACTION PRODUCTS BY FRACTIONAL DISTILLATION THE IMPROVEMENT WHICH COMPRISES ADDING INTO A FRACTIONATION ZONE WHERE VAPORS OF THE PHENOL ARE BEING DISTILLED FROM THE SLUDGE MATERIALS A HYDROCARBON OIL LESS VOLATILE THAN THE PHENOL, RECOVERING THE FRACTIONATED PHENOL AS A DISTILLATE FREED, SLUDGE, AND RECOVERING
Claim 2
Dependent Claim
64 words
IN A PROCESS OF PURIFYING PHENOL CONTAINED IN A FEED MIXTURE WITH SLUDGE MATERIALS COMPRISING C5-C7 OLEFIN AND DIOLEFIN REACTION PRODUCTS BY FRACTIONAL DISTILLATION THE IMPROVEMENT WHICH COMPRISES ADDING INTO A FRACTIONATION ZONE WHERE VAPORS OF THE PHENOL ARE BEING DISTILLED FROM THE SLUDGE MATERIALS A HYDROCARBON OIL LESS VOLATILE THAN THE PHENOL, RECOVERING THE FRACTIONATED PHENOL AS A DISTILLATE FREED, SLUDGE, AND RECOVERING
References Cited (Backward Citations)
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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) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |