US3907787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
7-(2-Thioxo-4-thiazolidinecarboxamido)cephalosporanic acids and the corresponding S-ethers
Assignee: Wyeth LLC
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Filing: 1974-02-22
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Granted: 1975-09-23
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Expires: 1994-02-22
Abstract
Abstract R3 is -H, an alkali metal or -NH4; and N IS 0 OR 1. The antibacterial agents of the invention present the formula: WHEREIN R1 is hydrogen or alkyl of 1 to 4 carbon atoms; R2 is -H, CH3CO2-, or when taken with the 3-carboxyl group, D R A W I N G
Inventors
- 👤 Daniel M Teller
- 👤 John H Sellstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:55
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20
Claims Analysis
Total Claims: 4
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
8 words
A compound of claim 1 of the formula:
Claim 4
Dependent Claim
9 words
The compound of claim 1 which is 7-(2-thioxo-4-thiazolidine-carboxamido)cephalosporanic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |