US3856785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cephalosporin esters
Assignee: ER Squibb and Sons LLC
•
Filing: 1972-07-24
•
Granted: 1974-12-24
•
Expires: 1992-07-24
Abstract
Abstract Cephalosporin esters and their methods of preparation are disclosed. In addition, compositions containing said compounds and methods for treating microbial infections utilizing said compositions are given.
Inventors
- 👤 H Breuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:06
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
7 words
The compound of claim 1, diethylaminoacetoxymethyl 7-thien-2-ylacetamidocephalosporanate.
Claim 4
Dependent Claim
9 words
The compounds of claim 1 wherein R1 is 2-thienylmethyl.
Claim 5
Dependent Claim
9 words
The compounds of claim 1 wherein R1 is 2-furylmethyl.
Claim 6
Dependent Claim
7 words
The compound of claim 1 D,L-valyloxymethyl 7-(thien-2-ylacetamido)cephalosporanate.
Claim 7
Dependent Claim
7 words
The compound of claim 1, glycyloxymethyl 7-thien-2-yl(ureido)acetamidocephalosporanate.
References Cited (Backward Citations)
US3488729A
Cited
US3655658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |