US2737511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of lactam
Assignee: —
•
Filing: —
•
Granted: 1956-03-06
•
Expires: 1973-03-06
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:43
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
PROCESS FOR THE PRODUCTION OF CAPROLACTAM BY THE BECKMANN TRANSFORMATION OF CYCLOHEXANONE OXIME, COMPRISING CARRYING OUT SAID TRANSFORMATION IN THE PRESENCE OF ACETIC ACID AND CONCENTRATED SULPHURIC ACID, DILUTING THE RESULTING MIXTURE TO CONTAIN 120-160 GRAMS OF SULPHURIC ACID PER LITRE OF COMBINED SULPHURIC ACID AND WATER AND EXTRACTING CAPROLACTAM BY MEANS OF CHLOROFORM WITHOUT NEUTRALISING THE ACID.
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) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |