US2573374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing lagtams
Assignee: —
•
Filing: —
•
Granted: 1951-10-30
•
Expires: 1968-10-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:54
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/16; C07D201/02; C07D201/04; C07D201/08; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10; C07D225/00; C07D225/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A CONTINUOUS METHOD OF PRODUCING LACTAMS FROM CYCLIC KETOXIMES WHICH COMPRISES DISSOLVING SAUD KETOXIME IN AN INERT SOLVENT HAVING A BOILING POINT BETWEEN 40* C.-160* C. WHICH IS IMMISCIBLE WITH WATER AND WITH SULFURIC ACID, INTRODUCING SAID KETOXIME SOLUTION INTO A PREHEATED SOLUTION OF SULFURIC ACID WHEREBY REARRANGEMENT TO THE LACTAM TAKES PLACE WITH THE EVOLUTION OF HEAT EVAPORATING SAID INERT SOLVENT THEREBY CONTROLLING THE HEAT EVOLVED DURING THE REARRANGEMENT REACTION, RECOVERING THE LACTAM FROM THE REACTION MIXTURE, CONDENSING THE VAPORS OF SAID INERT SOLVENT AND RECYCLING THE CONDENSED SOLVENT TO DISSOLVE FURTHER QUANTITIES OF KETOXIME.
Claim 2
Dependent Claim
96 words
A CONTINUOUS METHOD OF PRODUCING LACTAMS FROM CYCLIC KETOXIMES WHICH COMPRISES DISSOLVING SAUD KETOXIME IN AN INERT SOLVENT HAVING A BOILING POINT BETWEEN 40* C.-160* C. WHICH IS IMMISCIBLE WITH WATER AND WITH SULFURIC ACID, INTRODUCING SAID KETOXIME SOLUTION INTO A PREHEATED SOLUTION OF SULFURIC ACID WHEREBY REARRANGEMENT TO THE LACTAM TAKES PLACE WITH THE EVOLUTION OF HEAT EVAPORATING SAID INERT SOLVENT THEREBY CONTROLLING THE HEAT EVOLVED DURING THE REARRANGEMENT REACTION, RECOVERING THE LACTAM FROM THE REACTION MIXTURE, CONDENSING THE VAPORS OF SAID INERT SOLVENT AND RECYCLING THE CONDENSED SOLVENT TO DISSOLVE FURTHER QUANTITIES OF KETOXIME.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |