US3894029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of camptothecin and camptothecin-like compounds
Assignee: BASF SE
•
Filing: 1972-08-16
•
Granted: 1975-07-08
•
Expires: 1992-08-16
Abstract
Abstract Camptothecin, camptothecin-like compounds, and their production, a hydroxyl group being introduced into the lactone ring of the skeleton of camptothecin.
Inventors
- 👤 Ekkehard Winterfeldt
- 👤 Tilmann Korth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:17
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
9 words
A PROCESS FOR PRODUCING A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
9 words
A PROCESS FOR PRODUCING A COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
10 words
A process as in claim 1 wherein X is hydrogen.
Claim 4
Dependent Claim
31 words
A process as in claim 1 wherein said pH is from about 7.5 to about 5 and wherein said oxidation is carried out at a temperature from about 0*C to 80*C.
Claim 5
Dependent Claim
14 words
A process as in claim 1 wherein said oxidation catalyst is copper (II) chloride.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |