US3853861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cephalexin intermediate
Assignee: Eli Lilly and Co
•
Filing: 1971-12-08
•
Granted: 1974-12-10
•
Expires: 1991-12-08
Abstract
Abstract Para-nitrobenzyl 7-amino-3-methyl-3-cephem-4-carboxylate hydrochloride (p-nitrobenzyl 7-aminodesacetoxycephalosporinate hydrochloride), a stable, crystalline compound, useful as an intermediate in the synthesis of cephalexin, and other antibiotics.
Inventors
- 👤 W Garbrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:38
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
3 words
P-NITROBENZYE 7-AMINODESACETOXYCEPHALOSPORINATE HYDROCHLORIDE.
Claim 2
Dependent Claim
3 words
P-NITROBENZYE 7-AMINODESACETOXYCEPHALOSPORINATE HYDROCHLORIDE.
References Cited (Backward Citations)
US3644347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |