Patent US3892735A successfully refreshed from Google Patents.
US3892735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanodithiocarbamic acid derivatives of cephalosporins
Assignee: ER Squibb and Sons LLC
•
Filing: 1973-03-05
•
Granted: 1975-07-01
•
Expires: 1993-03-05
Abstract
Abstract New cyanodithiocarbamic acid derivatives of cephalosporins of the following general formula, and their salts WHEREIN R is hydrogen, lower alkyl, aralkyl, tri (lower alkyl)silyl, a salt forming ion or the group R1 is lower alkyl or phenyl-lower alkyl; R2 is hydrogen, lower alkyl, phenyl (which may be substituted) or certain heterocyclic groups; R3 is lower alkyl, phenyl or phenyl-lower alkyl and X is hydrogen, hydroxy, lower alkanoyloxy, lower alkoxy, lower alkylthio, aroyloxy, aralkanoyloxy, the radical of a nitrogen base, or together X and R represent a bond linking carbon and oxygen in a lactone ring; are useful as antibacterial agents.
Inventors
- 👤 Uwe D Treuner
- 👤 Hermann Breuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:57
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
5 words
A compound of the formula
Claim 4
Dependent Claim
5 words
A compound of the formula
Claim 5
Dependent Claim
31 words
A compound as in claim 2 wherein R is hydrogen or one of said salt forming ions; R1 is lower alkyl; R2 is hydrogen; and X is hydrogen or lower alkanoyloxy.
Claim 6
Dependent Claim
15 words
A compound as in claim 2 wherein R1 is lower alkyl and R2 is hydrogen.
Claim 7
Dependent Claim
19 words
A compound as in claim 4 wherein R is hydrogen or alkali metal and X is hydrogen or acetoxy.
Claim 8
Dependent Claim
18 words
A compound as in claim 2 wherein R, R2 and X each is hydrogen and R1 is methyl.
Claim 9
Dependent Claim
9 words
Alkali metal salt of the compound of claim 6.
Claim 10
Dependent Claim
20 words
A compound as in claim 2 wherein R and R2 each is hydrogen, R1 is methyl and X is acetoxy.
Claim 11
Dependent Claim
9 words
Alkali metal salt of the compound of claim 8.
Claim 12
Dependent Claim
20 words
A compound as in claim 2 wherein R is potassium, R1 is ethyl, R2 is hdyrogen and X is acetoxy.
References Cited (Backward Citations)
US3741962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |