US3337423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering isophorone
Assignee: Hibernia Chemie GmbH
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Filing: 1961-12-18
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Granted: 1967-08-22
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Expires: 1981-12-18
Abstract
No abstract record available.
Inventors
- 👤 Schmitt Karl
- 👤 Disteldorf Josef
- 👤 Baron Gunhild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:22
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
PROCESS FOR RECOVERING ISOPHORONE IN HIGH YIELDS FROM THE ORGANIC REACTION MIXTURE OBTAINED FROM THE CONDENSATION OF ACETONE TO ISOPHORONE WHEREIN SAID ORGANIC REACTION MIXTURE INCLUDES IN ADDITION TO ISOPHORONE SUBSTANTIALLY BOTH PRODUCTS HAVING A LOWER BOILING POINT THAN ISOPHORONE AND PRODUCTS HAVING A HIGHER BOILING POINT THAN ISOPHORONE, WHICH COMPRISES PASSING SUCH ORGANIC REACTION MIXTURE TO A DISTILLATION ZONE HAVING A HEAD, DISTILLING ACETONE IN SUCH DISTILLATION ZONE FROM AN INTERMIXTURE OF SUCH ORGANIC REACTION MIXTURE WITH A DILUTE AQUEOUS ALKALI SOLUTION IN A WEIGHT RATIO OF WATER TO ORGANIC REACTION MIXTURE OF FROM ABOUT 0.1 TO 10:1 MAINTAINED AT AN ELEVATED TEMPERATURE, SAID AQUEOUS ALKALI SOLUTION HAVING AN ALKALI CONCENTRATION BETWEEN ABOUT 0.001 AND 0.1% BY WEIGHT BASED ON THE WATER PRESENT IN THE AQUEOUS ALKALI SOLUTION, CONTINUOUSLY REMOVING FROM THE HEAD OF SAID ZONE THE ACETONE BEING DISTILLED, AND CONTINUOUSLY SEPARATELY CONDENSING THE REMOVED ACETONE, AND RECOVERING ISOPHORONE FROM THE INTERMIXTURE REMAINING.
Claim 2
Dependent Claim
155 words
PROCESS FOR RECOVERING ISOPHORONE IN HIGH YIELDS FROM THE ORGANIC REACTION MIXTURE OBTAINED FROM THE CONDENSATION OF ACETONE TO ISOPHORONE WHEREIN SAID ORGANIC REACTION MIXTURE INCLUDES IN ADDITION TO ISOPHORONE SUBSTANTIALLY BOTH PRODUCTS HAVING A LOWER BOILING POINT THAN ISOPHORONE AND PRODUCTS HAVING A HIGHER BOILING POINT THAN ISOPHORONE, WHICH COMPRISES PASSING SUCH ORGANIC REACTION MIXTURE TO A DISTILLATION ZONE HAVING A HEAD, DISTILLING ACETONE IN SUCH DISTILLATION ZONE FROM AN INTERMIXTURE OF SUCH ORGANIC REACTION MIXTURE WITH A DILUTE AQUEOUS ALKALI SOLUTION IN A WEIGHT RATIO OF WATER TO ORGANIC REACTION MIXTURE OF FROM ABOUT 0.1 TO 10:1 MAINTAINED AT AN ELEVATED TEMPERATURE, SAID AQUEOUS ALKALI SOLUTION HAVING AN ALKALI CONCENTRATION BETWEEN ABOUT 0.001 AND 0.1% BY WEIGHT BASED ON THE WATER PRESENT IN THE AQUEOUS ALKALI SOLUTION, CONTINUOUSLY REMOVING FROM THE HEAD OF SAID ZONE THE ACETONE BEING DISTILLED, AND CONTINUOUSLY SEPARATELY CONDENSING THE REMOVED ACETONE, AND RECOVERING ISOPHORONE FROM THE INTERMIXTURE REMAINING.
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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |