US3860591A
Expired / Lapsed
US
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Acylthiomethyl esters of cephalosporins
Assignee: ER Squibb and Sons LLC
•
Filing: 1972-08-03
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Granted: 1975-01-14
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Expires: 1992-08-03
Abstract
Abstract WHEREIN R1 is hydrogen, lower alkyl, cycloalkylmethyl, cycloalkenylmethyl, cycloalkadienylmethyl, aryloxymethyl, aralkyl, certain heterocyclic groups and certain substituted members of such groups; R2 is hydrogen, lower alkyl, phenyl or phenyl-lower alkyl and R3 is lower alkyl, lower alkenyl, aryl or aralkyl. X is hydrogen, hydroxy, lower alkanoyloxy, aroyloxy, lower alkoxy, aralkanoyloxy, the radical of a nitrogen base, a quarternary ammonium radical, lower alkylmercapto or certain heterocyclic substituted mercapto groups. They are useful as antibacterial agents. D R A W I N G New acylthiomethyl esters of cephalosporins have the formula
Inventors
- 👤 Hermann Breuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:42
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/24; C07D501/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
A compound as in claim 1 wherein R1 is benzyl or benzyl bearing on the Alpha -carbon amino, hydroxy, carboxy or ureido.
Claim 2
Dependent Claim
10 words
A compound as in claim 1 wherein R1 is phenoxymethyl.
Claim 3
Dependent Claim
15 words
A compound as in claim 1 wherein R2 is hydrogen and R3 is lower alkyl.
Claim 4
Dependent Claim
20 words
A compound as in claim 1 wherein R1 is benzyl, R2 is hydrogen, R3 is methyl and X is acetoxy.
Claim 5
Dependent Claim
20 words
A compound as in claim 1 wherein R1 is benzyl, R2 is hydrogen, R3 is methyl and X is hydrogen.
Claim 6
Dependent Claim
21 words
A compound as in claim 1 wherein R1 is Alpha -aminobenzyl, R2 is hydrogen, R3 is methyl and X is hydrogen.
Claim 7
Dependent Claim
20 words
A compound as in claim 1 wherein R1 is benzyl, R2 is hydrogen, R3 is phenyl and X is hydrogen.
Claim 8
Dependent Claim
20 words
A compound as in claim 1 wherein R1 is phenoxymethyl, R2 is hydrogen, R3 is methyl and X is acetoxy.
Claim 9
Dependent Claim
20 words
A compound as in claim 1 wherein R1 is benzyl, R2 is hydrogen, R3 is t-butyl and X is hydrogen.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |