US4252722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of 6-hydroxymethyl-2-(β-aminoethylthio)-1-carbadethiapen-2-em-3-carboxylic acid
Assignee: Merck and Co Inc
•
Filing: 1979-08-08
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Granted: 1981-02-24
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Expires: 1999-08-08
Abstract
Abstract Diclosed is a process for preparing the antibiotic 6-hydroxymethyl-2-(β-aminoethylthio)-1-carbadethiapen-2-em-3-carboxylic acid (I) ##STR1## and its pharmaceutically acceptable salt and ester derivatives.
Inventors
- 👤 David G. Melillo
- 👤 Kenneth M. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:37
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; C07C; C07C271/00; C07C271/06; C07C271/08; C07C271/10; C07C271/22; C07D207/00; C07D207/02; C07D207/04; C07D207/10; C07D207/16; C07D207/18; C07D207/22; C07D207/24; C07D477/00; C07D477/02; C07D477/04; C07D477/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
The compound: ##STR30## wherein R is hydrogen, a salt cation, or a readily removable protecting group.
Claim 2
Dependent Claim
16 words
The compound: ##STR30## wherein R is hydrogen, a salt cation, or a readily removable protecting group.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |