US3753973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
The preparation of 3'-4'-dideoxykanamycin b active against resistant bacteria
Assignee: Microbial Chemistry Research Foundation
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Filing: 1971-06-02
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Granted: 1973-08-21
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Expires: 1991-06-02
Abstract
Abstract SYNTHESIS OF 3''-4''-DIDEOXYKANAMYCIN B WHICH COMPRISES PROTECTING THE AMINO AND ALL OR A PART OF THE HYDROXYL GROUPS OTHER THAN 3'' AND 4''-HYDROXYL GROUPS OF KANAMYCIN B, SULFONYLATING 3''- AND 4''-HYDROXYL GROUPS TO GIVE A DERIVATIVE HAVING DISULFONIC ESTER GROUPS, REMOVING SAID ESTER GROUPS TO GIVE 3''-4''-UNSATURATED COMPOUND, REDUCING SAID COMPOUND AND FINALLY REMOVING THE RESIDUAL PROTECTING GROUPS.
Inventors
- 👤 S Umezawa
- 👤 H Umezawa
- 👤 T Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:25
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/222; C07H15/226; C07H15/234
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |