US3849408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-substituted-delta2-cephalosporin derivatives
Assignee: ER Squibb and Sons LLC
•
Filing: 1972-03-31
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Granted: 1974-11-19
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Expires: 1992-03-31
Abstract
Abstract 1. A COMPOUND HAVING THE FORMULA 2-R5,2-(HOOC-),3-R3,7-(A-PHENYLENE-CH2-CO-NH-)-3-CEPHEM DRAWING WHEREIN R3 IS ALKYL OF 1 TO 6 CARBONS; R5 IS SELECTED FROM THE GROUP CONSISTING OF ALKYL OF 1 TO 6 CARRBONS, CHLOROMETHYL, DIMETHYLAMINOMETHYL, BENZYL, BENZYLOXYMETHYL AND PHENYLCHLOROMETHYL; AND A IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL OF 1 TO 6 CARBONS, METHOXY, HALO, NITO, TRILFLUOROMETHYL, SULFAMYL, AND DIETHYLAMINO.
Inventors
- 👤 J Dolfini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:25
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |