US4487768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cephem compounds
Assignee: Astellas Pharma Inc
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Filing: 1982-12-22
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Granted: 1984-12-11
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Expires: 2002-12-22
Abstract
Abstract The invention relates to novel compounds of high antimicrobial activity of the formula: <IMAGE> wherein R1 is amino or protected amino, R2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl, and R3 is carboxy or protected carboxy, and a pharmaceutically acceptable salt thereof.
Inventors
- 👤 Takao Takaya
- 👤 Takashi Masugi
- 👤 Hisashi Takasugi
- 👤 Kenzi Miyai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:53
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/24; C07D501/38; C07D501/46; A; A61; A61P; A61P31/00; A61P31/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A compound of the formula: ##STR6## wherein R 1 is amino or protected amino, R 2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl, and R 3 is carboxy or protected carboxy, and a pharmaceutically acceptable salt thereof.
Claim 2
Dependent Claim
35 words
A compound of the formula: ##STR6## wherein R 1 is amino or protected amino, R 2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl, and R 3 is carboxy or protected carboxy, and a pharmaceutically acceptable salt thereof.
Claim 3
Dependent Claim
11 words
A compound of claim 1, which is 7-[2-carboxymethoxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetamido]-3-azidomethyl-3-cephem-4-carboxylic acid (syn isomer).
Claim 4
Dependent Claim
24 words
An antibacterial composition comprising an effective amount of a compound of claim 1 in association with a pharmaceutically acceptable substantially non-toxic carrier or excipient.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |