US3658799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cephalosporin compounds
Assignee: Glaxo Laboratories Ltd
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Filing: 1968-08-13
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Granted: 1972-04-25
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Expires: 1988-08-13
Abstract
Abstract 7B-AMINO- AND ACYLAMIDOCEPH-3-EM-4-CARBOXYLIC ACIDS HAVING AT THE 3-POSITION A HALO-, FORMYLOXY-, ISOTHIOCYANATO- OR HALOACETOXYMETHYL GROUP AND SALTS AND ESTERS THEREOF. THESE COMPOUNDS ARE USEFUL AS STARTING COMPOUNDS FOR PREPARING 7B-ACYLAMIDOCEPH-3-EM-4-CARBOXYLIC ACIDS HAVING A GROUP AT THE 3-POSITION, OTHER THAN 3-ACETOXYMETHYL, BY REACTION WITH A NUCLEOPHILE. THE COMPOUNDS PREPARED HAVE MODIFIED ANTIBIOTIC ACTIVITY.
Inventors
- 👤 Stephen Eardley
- 👤 James Kennedy
- 👤 Alan Gibson Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:58
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/02; C07D501/04; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/54; A61K31/542; A61K31/545; C07D501/14; C07D501/16; C07D501/18; C07D501/20; C07D501/24; C07D501/26; C07D501/38; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 0
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |