US3821207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
7-heterocyclic substituted cephalosporins
Assignee: GlaxoSmithKline LLC
•
Filing: 1971-06-21
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Granted: 1974-06-28
•
Expires: 1991-06-21
Abstract
Abstract 7-Heterocyclic Alpha -amino or Alpha hydroxyacetamidocephalosporins with various 3-substituents are prepared by conventional 7-acylation and 3-displacement reactions. The products are antibacterial agents.
Inventors
- 👤 A Chow
- 👤 G Dunn
- 👤 J Hoover
- 👤 J Weisbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:58
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A compound as claimed in claim 1, where A is OH.
Claim 2
Dependent Claim
11 words
A compound as claimed in claim 1, where A is NH2.
Claim 3
Dependent Claim
12 words
A compound as claimed in claim 3, being the compound 7-(2-amino-2-(1,2,3-triazol-4-yl)acetamido)-3-(1,2,3-triazol-4-ylthiomethyl)-3-cephem-4-carboxylic acid.
Claim 4
Dependent Claim
12 words
A compound as claimed in claim 3, being the compound 7-(2-amino-2-(1,2,4-triazol-3-yl)acetamido)-3-(1,2,4-triazol-3-ylthiomethyl)-3-cephem-4-carboxylic acid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |