US2502978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of secondary alcohols
Assignee: —
•
Filing: —
•
Granted: 1950-04-04
•
Expires: 1967-04-04
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:30
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/86; C07C29/80; C07C29/03; C07C29/04; C07C29/05; C07C29/06; C07C7/00; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE PROCESS OF RECOVERING A SECONDARY ALCOHOL FROM A SULFURIC ACID EXTRACT OF 70 TO 93% SULFURIC ACID CONCENTRATION CONTAINING ALKYL SULFATES AND FREE SECONDARY ALCOHOL WHICH COMPRISES DILUTING THE SULFURIC ACID EXTRACT TO 40 TO 70% ACID CONCENTRATION, STRIPPING THE FREE SECONDARY ALCOHOL FROM THE DILUTED EXTRACT WHILE MAINTAINING THE ALKYL SULFATE CONTENT OF THE EXTRACT SUBSTANTIALLY CONSTANT BY PASSING THE DILUTE ACID EXTRACT IN COUNTERCURRENT FLOW TO STEAM IN A STRIPPING COLUMN AND REMOVING THE STRIPPED DILUTE SULFURIC ACID EXTRACT FROM THE STRIPPING COLUMN AS SOON AS IT REACHES THE BOTTOM THEREOF, AND FURTHER STRIPPING THE STRIPPED SULFURIC ACID EXTRACT TO RECOVER ADDITIONAL SECONDARY ALCOHOL THEREFROM.
Claim 2
Dependent Claim
108 words
THE PROCESS OF RECOVERING A SECONDARY ALCOHOL FROM A SULFURIC ACID EXTRACT OF 70 TO 93% SULFURIC ACID CONCENTRATION CONTAINING ALKYL SULFATES AND FREE SECONDARY ALCOHOL WHICH COMPRISES DILUTING THE SULFURIC ACID EXTRACT TO 40 TO 70% ACID CONCENTRATION, STRIPPING THE FREE SECONDARY ALCOHOL FROM THE DILUTED EXTRACT WHILE MAINTAINING THE ALKYL SULFATE CONTENT OF THE EXTRACT SUBSTANTIALLY CONSTANT BY PASSING THE DILUTE ACID EXTRACT IN COUNTERCURRENT FLOW TO STEAM IN A STRIPPING COLUMN AND REMOVING THE STRIPPED DILUTE SULFURIC ACID EXTRACT FROM THE STRIPPING COLUMN AS SOON AS IT REACHES THE BOTTOM THEREOF, AND FURTHER STRIPPING THE STRIPPED SULFURIC ACID EXTRACT TO RECOVER ADDITIONAL SECONDARY ALCOHOL THEREFROM.
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) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |