US2736728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of lysergic acid amides
Assignee: Eli Lilly and Co
•
Filing: 1954-12-06
•
Granted: 1956-02-28
•
Expires: 1974-12-06
Abstract
No abstract record available.
Inventors
- 👤 Richard P Pioch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:04
CPC Classifications
C; C07; C07D; C07D457/00; C07D457/04; C07D457/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE METHOD WHICH COMPRISES REACTING DRY LYSERGIC ACID WITH TRIFLUOROACETIC ANHYDRIDE AT A TEMPERATURE BELOW ABOUT 0* C. TO PRODUCE A MIXED ANHYDRIDE OF LYSEGIC AND TRIFLUOROACETIC ACIDS, AND REACTING SAID MIXED ANHYDRIDE WITH A NITROGENOUS BASE HAVING AT LEAST ONE HYDROGEN LINKED TO NITROGEN, THEREBY TO PRODUCE A LYSERGIC ACID AMIDE.
Claim 2
Independent Claim
52 words
THE METHOD WHICH COMPRISES REACTING DRY LYSERGIC ACID WITH TRIFLUOROACETIC ANHYDRIDE AT A TEMPERATURE BELOW ABOUT 0* C. TO PRODUCE A MIXED ANHYDRIDE OF LYSEGIC AND TRIFLUOROACETIC ACIDS, AND REACTING SAID MIXED ANHYDRIDE WITH A NITROGENOUS BASE HAVING AT LEAST ONE HYDROGEN LINKED TO NITROGEN, THEREBY TO PRODUCE A LYSERGIC ACID AMIDE.
References Cited (Backward Citations)
US648580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |