US2988546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lactam
Assignee: —
•
Filing: —
•
Granted: 1961-06-13
•
Expires: 1978-06-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
C; C07; C07D; C07D413/00; C07D413/02; C07D413/12; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE IMPROVED PROCESS FOR THE PREPARATION OF C10 TO C18 LACTAMS WHICH COMPRISES REACTING A C10 TO C18 MONOCYCLIC KETONE WITH AN ALKALI MINERAL AZIDE IN THE PRESENCE OF A STRONG MINERAL ACID AT TEMPERATURES OF 0 TO 50* C. AND PRESSURES OF 0.7 TO 10 ATMOSPHERES, ALLOWING AN AQUEOUS LAYER TO SEPARATE FROM AN ORGANIC LAYER IN THE REACTION PRODUCTS, SEPARATING CRYSTALS OF A SOLID ALKALI METAL SALT FORMED IN THE REACTION FROM THE AQUEOUS LAYER AND RECYCLING THE PURIFIED AQUEOUS LAYER TO THE PROCESS.
Claim 2
Dependent Claim
86 words
THE IMPROVED PROCESS FOR THE PREPARATION OF C10 TO C18 LACTAMS WHICH COMPRISES REACTING A C10 TO C18 MONOCYCLIC KETONE WITH AN ALKALI MINERAL AZIDE IN THE PRESENCE OF A STRONG MINERAL ACID AT TEMPERATURES OF 0 TO 50* C. AND PRESSURES OF 0.7 TO 10 ATMOSPHERES, ALLOWING AN AQUEOUS LAYER TO SEPARATE FROM AN ORGANIC LAYER IN THE REACTION PRODUCTS, SEPARATING CRYSTALS OF A SOLID ALKALI METAL SALT FORMED IN THE REACTION FROM THE AQUEOUS LAYER AND RECYCLING THE PURIFIED AQUEOUS LAYER TO THE PROCESS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |