US3852283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amino acid derivatives of cephalosporins
Assignee: ER Squibb and Sons LLC
•
Filing: 1972-12-11
•
Granted: 1974-12-03
•
Expires: 1992-12-11
Abstract
Abstract Novel cephalosporins having the formula: ARE DISCLOSED ALONG WITH METHODS FOR THE PREPARATION OF THESE COMPOUNDS.
Inventors
- 👤 J Dolfini
- 👤 R Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:27
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20
Claims Analysis
Total Claims: 7
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
11 words
A compound as defined in claim 1 wherein R1 is hydrogen.
Claim 4
Dependent Claim
11 words
A compound as defined in claim 1 wherein R1 is hydroxy.
Claim 5
Dependent Claim
10 words
A compound as defined in claim 1 wherein R1 is
Claim 6
Dependent Claim
13 words
A compound as defined in claim 1 wherein X is hydrogen or acetoxy.
Claim 7
Dependent Claim
18 words
A compound as defined in claim 1 wherein n is 1, m is 1, and p is 1.
References Cited (Backward Citations)
US3352850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |