US3880842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cephalosporin derivatives
Assignee: ER Squibb and Sons LLC
•
Filing: 1972-05-30
•
Granted: 1975-04-29
•
Expires: 1992-05-30
Abstract
Abstract WHEREIN Z is hydrogen, lower alkyl or a salt forming ion and R is aryl, substituted aryl, lower alkyl or cycloalkyl. These compounds are useful as antibacterial agents. This invention relates to new cephalosporin derivatives and methods for preparing the same, said derivatives having the structure
Inventors
- 👤 Bong Kuk Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:58
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/22
Claims Analysis
Total Claims: 6
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
10 words
A compound in accordance with claim 1 of the formula
Claim 4
Dependent Claim
11 words
A compound in accordance with claim 2 wherein Z is Na.
Claim 5
Dependent Claim
10 words
A compound in accordance with claim 1 of the formula
Claim 6
Dependent Claim
11 words
A compound in accordance with claim 4 wherein Z is Na.
References Cited (Backward Citations)
US3222362A
Cited
US3708479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |