US3947413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-α-Substituted cephalosporins
Assignee: Merck and Co Inc
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Filing: 1973-08-27
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Granted: 1976-03-30
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Expires: 1993-08-27
Abstract
Abstract Novel cephalosporin compounds having a 3'- alpha -methyl, a 3-aryl or 3-heterocycle substituent are prepared by total synthesis. The novel cephalosporin compounds are active against gram-negative and gram-positive microorganisms.
Inventors
- 👤 Burton G. Christensen
- 👤 Ronald W. Ratcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:25
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/24; C07D277/00; C07D277/02; C07D277/20; C07D277/22; C07D277/24; C07D277/28; C07D277/32; C07D277/56; C07D279/00; C07D279/04; C07D279/06; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006; C07F9/547; C07F9/553; C07F9/568; C07F9/6561; C07F9/65613
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
44 words
A compound of the formula ##SPC11## and the non-toxic pharmaceutically acceptable salts and benzyl ester or alkyl esters of up to 4 carbons thereof wherein R 3 is hydrogen, amino or carboxy, R 4 is phenyl or thienyl and B is hydrogen or methoxy.
Claim 2
Dependent Claim
44 words
A compound of the formula ##SPC11## and the non-toxic pharmaceutically acceptable salts and benzyl ester or alkyl esters of up to 4 carbons thereof wherein R 3 is hydrogen, amino or carboxy, R 4 is phenyl or thienyl and B is hydrogen or methoxy.
Claim 3
Dependent Claim
6 words
Sodium dl-3-(1-acetoxyethyl)-7β(2-thienylacetamido)-3-cephem-4-carboxylate, according to claim 1.
References Cited (Backward Citations)
US3799922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |