US4556513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of antibiotic 1-oxadethiacephalosporins, and intermediate
Assignee: Meiji Seika Kaisha Ltd
•
Filing: 1984-08-15
•
Granted: 1985-12-03
•
Expires: 2004-08-15
Abstract
Abstract Disclosed is a process for preparing antibiotic 1-oxadethiacephalosporins via diazo-species I: ##STR1## wherein: A is acyl; R 1 is H or OCH 3 ; and R 2 is a protecting group.
Inventors
- 👤 Seiji Shibahara
- 👤 Tsuneo Okonogi
- 👤 Yasushi Murai
- 👤 Shunzo Fukatsu
- 👤 Taro Niida
- 👤 Tadashi Wakazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:49
CPC Classifications
C; C07; C07D; C07D505/00; C07D205/00; C07D205/02; C07D205/06; C07D205/08; C07D205/085; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A diazo compound represented by the formula ##STR34## wherein A denotes an acyl group, R 1 denotes a hydrogen atom or a methoxy group and R 2 denotes a carboxy-protecting group selected from the group consisting of alkyl or aralkyl substituents.
Claim 2
Dependent Claim
41 words
A diazo compound represented by the formula ##STR34## wherein A denotes an acyl group, R 1 denotes a hydrogen atom or a methoxy group and R 2 denotes a carboxy-protecting group selected from the group consisting of alkyl or aralkyl substituents.
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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |