US2692878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method forithe continuous produc-
Assignee: —
•
Filing: —
•
Granted: 1954-10-26
•
Expires: 1971-10-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:44
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/08; C07D201/16; C07D201/04; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE PROCESS FOR CONTINUOUS PRODUCTION OF PURE LACTAMS FROM RAW LACTAMS OBTAINED BY THE BECKMANN REARRANGEMENT OF CYCLIC OXIMES, WHICH COMPRISES SATURATING DILUTED AQUEOUS RAW LACTAM SOLUTION WITH NEUTRAL SALTS, SUBJECTING SAID SATURATED SOLUTIONS TO A PRELIMINARY EXTRACTION WITH UNSUBSTITUTED HYDROCARBON SOLVENTS BOILING BELOW 100* C. AND DISSOLVING AT 20* C. NOT MORE THAN 0.1% WATER AND UP TO 30% OF LACTAMS, IN A PLURALITY OF STAGES ON THE COUNTERFLOW PRINCIPAL, SUBJECTING THE RESULTING CONSIDERABLY PURIFIED SOLUTIONS OF THE LACTAMS TO A SECOND PURIFYING TREATMENT WITH INORGANIC ACID-BINDING SUBSTANCES IN THE PRESENCE OF WATER AT A PH FROM 7-12 IN AT LEAST ONE STAGE AND SUBSEQUENTLY ELIMINATING THE SOLVENT.
Claim 2
Dependent Claim
109 words
THE PROCESS FOR CONTINUOUS PRODUCTION OF PURE LACTAMS FROM RAW LACTAMS OBTAINED BY THE BECKMANN REARRANGEMENT OF CYCLIC OXIMES, WHICH COMPRISES SATURATING DILUTED AQUEOUS RAW LACTAM SOLUTION WITH NEUTRAL SALTS, SUBJECTING SAID SATURATED SOLUTIONS TO A PRELIMINARY EXTRACTION WITH UNSUBSTITUTED HYDROCARBON SOLVENTS BOILING BELOW 100* C. AND DISSOLVING AT 20* C. NOT MORE THAN 0.1% WATER AND UP TO 30% OF LACTAMS, IN A PLURALITY OF STAGES ON THE COUNTERFLOW PRINCIPAL, SUBJECTING THE RESULTING CONSIDERABLY PURIFIED SOLUTIONS OF THE LACTAMS TO A SECOND PURIFYING TREATMENT WITH INORGANIC ACID-BINDING SUBSTANCES IN THE PRESENCE OF WATER AT A PH FROM 7-12 IN AT LEAST ONE STAGE AND SUBSEQUENTLY ELIMINATING THE SOLVENT.
References Cited (Backward Citations)
US2221369A
Cited
US2423200A
Cited
US2234566A
Cited
US2313026A
Cited
US2341907A
Cited
FR896883A
Cited
US2462008A
Cited
US2462009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |