US2533699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amines containing the king system
Assignee: —
•
Filing: —
•
Granted: 1950-12-12
•
Expires: 1967-12-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:48
CPC Classifications
C; C07; C07D; C07D457/00; C07D457/02; C07D457/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
34 words
A PROCESS FOR THE MANUFACTURE OF 6-METHYL8-AMINO-ERGOLEN, WHICH COMPRISES THE STEP OF BOILING LYSERGIC ACID AZIDE IN A DILUTE AQUEOUS SOLUTION OF HYDROCHLORIC ACID UNTIL THE EVOLUTION OF NITROGEN AND CARBON DIOXIDE HAS CEASED.
References Cited (Backward Citations)
US2090430A
Cited
US2265217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |