US3819643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of 6-amino penicillanic acid
Assignee: Leo Pharma AS
•
Filing: 1971-12-22
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Granted: 1974-06-25
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Expires: 1991-12-22
Abstract
Abstract THE INVENTION COMPRISES ANTIBIOTICALLY ACTIVE NEW ESTERS OF A-AMINOBENZYLPENICILLIN OF THE FORMULA: 2-(A-(CH2)N-COO-CH2-OOC-),3,3-DI(CH3-),6-(PHENYL- CH(*)(-NH2)-CO-NH-)PENAM IN WHICH THE ASTERISK INDICATES AN ASYMMETRIC CARBON ATOM; N IS AN INTEGER ROM 0 TO 5; AND A IS AN UNSUBSTITUTED OR SUBSTITUTED ALIPHATIC, AICYCLIC, AROMATIC, OR HETEROCYCLIC RADICAL; THE SALTS OF SAID ESTERS WITH PHARMACEUTICALLY ACCEPTABLE ACIDS; AND METHODS OF PREPARING THE ESTERS AND SALTS.
Inventors
- 👤 E Frederiksen
- 👤 W Godtfredsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:24
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 0
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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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |