US3337632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering isophorone in high purity
Assignee: HIBERNIA CHEMIC 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 07:17
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/18; E04B1/20; E04B1/21; C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/74; C07C45/78; C07C45/81; C07C45/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN THE PROCESS FOR PRODUCING ISOPHORONE IN HIGH PURITY BY PRESSURE CONDENSATION OF ACETONE IN THE PRESENCE OF AQUEOUS ALKALI IN A CONCENTRATION OF BETWEEN ABOUT 0.04 AND 0.1% BY WEIGHT BASED ON THE TOTAL QUANTITY OF LIQUIDS IN THE REACTION MIXTURE TO FORM ISOPHORONE AND SUBSEQUENT DISTILLATION OF THE ISOPHORONE-CONTAINING REACTION MIXTURE TO RECOVER ISOPHORONE IN HIGH PURITY, THE IMPROVEMENT WHICH COMPRISES DISTILLING ACETONE FROM THE ORGANIC REACTION MIXTURE OBTAINED FROM THE PRESSURE CONDENSATION OF ACETONE TO ISOPHORONE, WHICH REACTION MIXTURE INCLUDES BESIDES ISOPHORONE SUBSTANTIALLY BOTH PRODUCTS HAVING A LOWE BOILING POINT THAN ISOPHORONE AND PRODUCTS HAVING A HIGH BOILING POINT THAN ISOPHORONE, AT A POSITIVE PRESSURE SUFFICIENT TO PERMIT THE CONDENSATION BACK TO LIQUID FORM OF DISTILLED ACETONE AT A TEMPERATURE ABOVE ABOUT 100 AND UP TO 235*C., SAID POSITIVE PRESSURE BEING AUTOGENOUS AT SAID TEMPERATURE, CONTINUOUSLY RE-
Claim 2
Dependent Claim
140 words
IN THE PROCESS FOR PRODUCING ISOPHORONE IN HIGH PURITY BY PRESSURE CONDENSATION OF ACETONE IN THE PRESENCE OF AQUEOUS ALKALI IN A CONCENTRATION OF BETWEEN ABOUT 0.04 AND 0.1% BY WEIGHT BASED ON THE TOTAL QUANTITY OF LIQUIDS IN THE REACTION MIXTURE TO FORM ISOPHORONE AND SUBSEQUENT DISTILLATION OF THE ISOPHORONE-CONTAINING REACTION MIXTURE TO RECOVER ISOPHORONE IN HIGH PURITY, THE IMPROVEMENT WHICH COMPRISES DISTILLING ACETONE FROM THE ORGANIC REACTION MIXTURE OBTAINED FROM THE PRESSURE CONDENSATION OF ACETONE TO ISOPHORONE, WHICH REACTION MIXTURE INCLUDES BESIDES ISOPHORONE SUBSTANTIALLY BOTH PRODUCTS HAVING A LOWE BOILING POINT THAN ISOPHORONE AND PRODUCTS HAVING A HIGH BOILING POINT THAN ISOPHORONE, AT A POSITIVE PRESSURE SUFFICIENT TO PERMIT THE CONDENSATION BACK TO LIQUID FORM OF DISTILLED ACETONE AT A TEMPERATURE ABOVE ABOUT 100 AND UP TO 235*C., SAID POSITIVE PRESSURE BEING AUTOGENOUS AT SAID TEMPERATURE, CONTINUOUSLY RE-
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 |