US2817661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of lactams from the reaction
Assignee: —
•
Filing: —
•
Granted: 1957-12-24
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Expires: 1974-12-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:53
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/04; C07D201/16; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A PROCESS FOR RECOVERING A LACTAM FROM THE REACTION MIXTURE OBTAINED BY SULFURIC ACID REARRANGEMENT OF A CYCLIC KETOXIME SELECTED FROM THE GROUP CONSISTING OF CYCLOPENTANONE OXIME, CYCLOHEXANONE OXIME, CYCLOHEPTANONE OXIME AND ALKYLATED DERIVATIVES THEREOF WHEREIN SAID MIXTURE IS NEUTRALIZED, THE RESULTING AQUEOUS SALT SOLUTION AND WATER-CONTAINING LACTAM OIL SEPARATED FROM EACH OTHER AND THE LACTAM IN SAID OIL EXTRACTED BY TREATING THE OIL WITH AN ORGANIC SOLVENT FOR SAID LACTAM, THE IMPROVEMENT WHICH COMPRISES CONCENTRATING THE WATER-CONTAINING LACTAM OIL WHICH HAS BEEN SEPARATED FROM THE AQUEOUS SALT SOLUTION UNTIL THE LACTAM CONTENT THEREIN AMOUNTS TO FROM 80 TO 90% BY WEIGHT OF THE OIL PRIOR TO EXTRACTION OF SAID LACTAM.
Claim 2
Dependent Claim
112 words
IN A PROCESS FOR RECOVERING A LACTAM FROM THE REACTION MIXTURE OBTAINED BY SULFURIC ACID REARRANGEMENT OF A CYCLIC KETOXIME SELECTED FROM THE GROUP CONSISTING OF CYCLOPENTANONE OXIME, CYCLOHEXANONE OXIME, CYCLOHEPTANONE OXIME AND ALKYLATED DERIVATIVES THEREOF WHEREIN SAID MIXTURE IS NEUTRALIZED, THE RESULTING AQUEOUS SALT SOLUTION AND WATER-CONTAINING LACTAM OIL SEPARATED FROM EACH OTHER AND THE LACTAM IN SAID OIL EXTRACTED BY TREATING THE OIL WITH AN ORGANIC SOLVENT FOR SAID LACTAM, THE IMPROVEMENT WHICH COMPRISES CONCENTRATING THE WATER-CONTAINING LACTAM OIL WHICH HAS BEEN SEPARATED FROM THE AQUEOUS SALT SOLUTION UNTIL THE LACTAM CONTENT THEREIN AMOUNTS TO FROM 80 TO 90% BY WEIGHT OF THE OIL PRIOR TO EXTRACTION OF SAID LACTAM.
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) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |