Patent US3912728A successfully refreshed from Google Patents.
US3912728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
7-(3-Substituted ureido and -thioureido) cephalosporins
Assignee: Recherche et Industrie Therapeutiques
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Filing: 1973-05-17
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Granted: 1975-10-14
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Expires: 1993-05-17
Abstract
Abstract Cephalosporin compounds with 3-substituted ureido or -thioureido group at position 7 and hydrogen or heterocyclicthiomethyl groups at position 3 are prepared. These compounds are antibacterial agents.
Inventors
- 👤 Pierre Crooij
- 👤 Alain Colinet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:05
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/24; C07D501/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
4 words
A COMPOUND OF THEFORMULA:
Claim 2
Dependent Claim
4 words
A COMPOUND OF THEFORMULA:
Claim 3
Dependent Claim
11 words
A compound aCcording to claim 1, where R1 is unsubstituted benzyl.
Claim 4
Dependent Claim
24 words
A compound according to claim 1, where R2 is 1,3,4-thiadiazol15-yl, 1,3,4-oxadiazol-5-yl, 1H-tetrazol-5-yl, 1,2,4-triazol-3-yl, or 1,2,3-triazol-5-yl, or a methyl derivative of any of such groups.
Claim 5
Dependent Claim
10 words
A compound according to claim 1, being 7-(3-benzylureido)-3-(5-methyl-1,3,4-thiadiazol-2-ylthiomethyl)-3-cephem-4 -carboxylic acid.
Claim 6
Dependent Claim
10 words
A compound according to claim 1, being 7-(3-benzylureido)-3-(1-metyl-1H-tetrazol-5-ylthiomethyl)-3-cephem-4 -carboxylic acid.
Claim 7
Dependent Claim
9 words
A compound according to claim 1, being 7-(3-benzylureido)-3-(1,3,4-triazol-2-ylthuomethyl)-3-cephem-4-carboxylic 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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |