US3821209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cephalosporin derivatives
Assignee: Glaxo Laboratories Ltd
•
Filing: 1972-01-19
•
Granted: 1974-06-28
•
Expires: 1992-01-19
Abstract
Abstract WHEREIN R is -CO.COOH or -COOH and X is an acetate group, a hydroxy group, a hydrogen atom or the residue of a nucleophile. Cephalosporin derivatives having antibacterial activity or of value of intermediates have the formula
Inventors
- 👤 B Arnold
- 👤 R Fildes
- 👤 D Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:17
CPC Classifications
C; C12; C12P; C12P35/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/913; Y10S435/915; Y10S435/919
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
The compound of claim 1 which is 3-acetoxymethyl-7 Beta -(5-carboxy-5-oxopentanamido) ceph-3-em-4-carboxylic acid.
Claim 2
Dependent Claim
12 words
The compound of claim 1 which is 3-acetoxymethyl-7 Beta -(4-carboxybutanamido) ceph-3-em-4-carboxylic acid.
Claim 3
Dependent Claim
11 words
The compound of claim 1 which is 7 Beta -(5-carboxy-5-oxopentanamido-3-hydroxymethylceph-3-em-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 |