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US4085277A
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7(2-Phenyl or thienyl-2-isonicotinoyloxyacetamido)-3-(1-methyl-1-H tetrazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid
Assignee: Astellas Pharma Inc
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Filing: 1976-11-15
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Granted: 1978-04-18
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Expires: 1996-11-15
Abstract
Abstract This invention relates to cephalosporanic acid derivatives of the formula: <IMAGE> where R1 is phenyl or thienyl, R2 is pyridyl and R3 is hydrogen or alkylthio, and pharmaceutically aceptable salts thereof, which possess antibacterial activity, pharmactical compositions of the same and processes for the preparation thereof.
Inventors
- 👤 Hirokichi Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:42
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
A compound of the formula: ##STR9## wherein R 1 is phenyl or thienyl, R 2 is pyridyl, and R 3 is hydrogen or alkylthio, and a pharmaceutically acceptable salt thereof.
Claim 2
Dependent Claim
30 words
A compound of the formula: ##STR9## wherein R 1 is phenyl or thienyl, R 2 is pyridyl, and R 3 is hydrogen or alkylthio, and a pharmaceutically acceptable salt thereof.
Claim 3
Dependent Claim
11 words
A compound according to claim 1, wherein R 1 is phenyl.
Claim 4
Dependent Claim
19 words
A compound according to claim 2, wherein R 2 is 2-, 3- or 4-pyridyl, and R 3 is hydrogen.
Claim 5
Dependent Claim
16 words
A compound according to claim 2, wherein R 2 is 3-pyridyl, and R 3 is methylthio.
Claim 6
Dependent Claim
16 words
A compound according to claim 1, wherein R 1 is thienyl, and R 3 is hydrogen.
Claim 7
Dependent Claim
13 words
A compound according to claim 5, wherein R 2 is 3- or 4-pyridyl.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |