US2906675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
gallons
Assignee: —
•
Filing: —
•
Granted: 1959-09-29
•
Expires: 1976-09-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:27
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C07C37/00; C07C37/08; C07C39/00; C07C39/02; C07C39/04; C07C45/00; C07C45/51; C07C45/53; C07C45/78; C07C45/81; C07C45/82; C07C45/85; C07C49/00; C07C49/04; C07C49/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
THE PROCESS FOR THE PURIFICATION OF THE CRUDE ACETONE OBTAINED BY THE DECOMPOSITION OF CUMENE HYDROPEROXIDE WHICH COMPRISES FRACTIONALLY DISTILLING SAID ACETONE BY CONTINUOUSLY INTRODUCING IT AT A RATE IN THE RANGE OF ABOUT 5 TO ABOUT 10 GALLONS PER MINUTE INTO A FRACTIONAL DISTILLATION COLUMN AT AN INTERMEDIATE POINT IN SAID COLUMN, CONTINUOUSLY ADDING TO SAID COLUMN AT A POINT SUBSTANTIALLY BELOW THE TOP OF THE COLUMN BUT ABOVE THE ACETONE FEED POINT AN AQUEOUS SOLUTION ABOUT 5 TO ABOUT 25% CONCENTRATION OF AN ALKALI METAL HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE, THE AQUEOUS HYDROXIDE SOLUTION BEING ADDED AT A RATE VARYING BETWEEN ABOUT 5 GALIONS PER HOUR WHEN THE CONCENTRATION IS ABOUT5% AND ABOUT 1 GALLON PER HOUR WHEN THE CONCENTRATION IS ABOUT 25%, AND REMOVING PURE ACETONE AS OVERHEAD FROM SAID COLUMN.
Claim 2
Dependent Claim
141 words
THE PROCESS FOR THE PURIFICATION OF THE CRUDE ACETONE OBTAINED BY THE DECOMPOSITION OF CUMENE HYDROPEROXIDE WHICH COMPRISES FRACTIONALLY DISTILLING SAID ACETONE BY CONTINUOUSLY INTRODUCING IT AT A RATE IN THE RANGE OF ABOUT 5 TO ABOUT 10 GALLONS PER MINUTE INTO A FRACTIONAL DISTILLATION COLUMN AT AN INTERMEDIATE POINT IN SAID COLUMN, CONTINUOUSLY ADDING TO SAID COLUMN AT A POINT SUBSTANTIALLY BELOW THE TOP OF THE COLUMN BUT ABOVE THE ACETONE FEED POINT AN AQUEOUS SOLUTION ABOUT 5 TO ABOUT 25% CONCENTRATION OF AN ALKALI METAL HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE, THE AQUEOUS HYDROXIDE SOLUTION BEING ADDED AT A RATE VARYING BETWEEN ABOUT 5 GALIONS PER HOUR WHEN THE CONCENTRATION IS ABOUT5% AND ABOUT 1 GALLON PER HOUR WHEN THE CONCENTRATION IS ABOUT 25%, AND REMOVING PURE ACETONE AS OVERHEAD FROM SAID COLUMN.
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) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |