US3769277A
Expired / Lapsed
US
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Preparation of delta3-4 carboxy cephalosporins having a 3-vinyl or substituted 3-vinyl group
Assignee: Glaxo Laboratories Ltd
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Filing: 1971-01-20
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Granted: 1973-10-30
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Expires: 1991-01-20
Abstract
Abstract THE INVENTION IS CONCERNED WITH THE PREPARATION OF $3-4CARBOXY CEPHALOSPORIN ANTIBIOTICS POSSESSING A 3-VINYL OR SUBSTITUTED 3-VINYL GROUPS BY CONDENSATION OF 3-FORMYL CEPHALOSPORIN COMPOUNDS WITH A PHOSPHORANE YLID.
Inventors
- 👤 A Long
- 👤 N Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:28
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6561; C07F9/65613
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |