Patent US3975385A successfully refreshed from Google Patents.
US3975385A
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7-Trichloroacetamido-3-desacetoxy-cephalosporanic acid esters
Assignee: Rhone Poulenc SA
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Filing: 1974-09-05
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Granted: 1976-08-17
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Expires: 1994-09-05
Abstract
Abstract The invention provides 7-trichloroacetamido-3-desacetoxy-cephalosporanic acid derivatives of the formula: ##SPC1## Wherein R is a group which protects the carboxylic acid radical, which can be converted into 7-amino-3-desacetoxycephalosporanic acid by replacing the R-- and Cl 3 C--CO-- radicals by hydrogen atoms.
Inventors
- 👤 Jean Bouchaudon
- 👤 Pierre Le Roy
- 👤 Mayer Naoum Messer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:51
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
39 words
A 7-trichloroacetamido-3-desacetoxy-cephalosporanic acid of the formula: ##SPC16## in which R is alkyl of 1 to 4 carbon atoms, unsubstituted or substituted by halogen, benzyl, unsubstituted or substituted by nitro or alkoxy of 1 to 4 carbon atoms, or phenacyl.
Claim 2
Dependent Claim
39 words
A 7-trichloroacetamido-3-desacetoxy-cephalosporanic acid of the formula: ##SPC16## in which R is alkyl of 1 to 4 carbon atoms, unsubstituted or substituted by halogen, benzyl, unsubstituted or substituted by nitro or alkoxy of 1 to 4 carbon atoms, or phenacyl.
Claim 3
Dependent Claim
20 words
A compound as claimed in claim 1, in which R is methyl, tertiary butyl, 2,2,2-trichloroethyl, benzyl, p-methoxybenzyl, p-nitrobenzyl or phenacyl.
Claim 4
Dependent Claim
10 words
A compound as claimed in claim 1 which is 3-methyl-8-oxo-7-trichloroacetamido-2-trichloroethoxycarbonyl-5-thia-1-aza-bicyclo[4,2,0]oct-2-ene.
Claim 5
Dependent Claim
10 words
A compound as claimed in claim 1, which is 2-p-methoxybenzyloxycarbonyl-3-methyl-8-oxo-7-trichloroacetamido-5-thia-1-aza-bicyclo[4,2,0]oct-2-ene.
References Cited (Backward Citations)
US3555017A
Cited
US3591585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |