Patent US2939865A successfully refreshed from Google Patents.
US2939865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing the volatile
Assignee: —
•
Filing: —
•
Granted: 1960-06-07
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Expires: 1977-06-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:11
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/08; C07D201/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
IN THE PROCESS FOR PURIFYING LACTAMS THAT HAVE BEEN OBTAINED BY BECKMANN REARRANGEMENT OF ALICYCLIC OXIMES WITH STRONG SULPHURIC ACID AND ENSURING NEUTRALIZATION, AND THAT HAVE BEEN PREPURIFIED BY REMOVAL OF NONVOLATILE IMPURITIES AND WATER BUT THAT STILL CONTAIN SMALL AMOUNTS OF VOLATILE ORGANIC IMPURITIES, THE STEP WHICH COMPRISES REMOVING THE VOLATILE ORGANIC IMPURITIES BY EVAPORATION FROM THE SOLID LACTAM.
Claim 2
Dependent Claim
60 words
IN THE PROCESS FOR PURIFYING LACTAMS THAT HAVE BEEN OBTAINED BY BECKMANN REARRANGEMENT OF ALICYCLIC OXIMES WITH STRONG SULPHURIC ACID AND ENSURING NEUTRALIZATION, AND THAT HAVE BEEN PREPURIFIED BY REMOVAL OF NONVOLATILE IMPURITIES AND WATER BUT THAT STILL CONTAIN SMALL AMOUNTS OF VOLATILE ORGANIC IMPURITIES, THE STEP WHICH COMPRISES REMOVING THE VOLATILE ORGANIC IMPURITIES BY EVAPORATION FROM THE SOLID 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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |