US3751339A
Expired / Lapsed
US
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Process for preparing chloramphenicol analogues
Assignee: KH Neochem Co Ltd
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Filing: 1971-04-26
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Granted: 1973-08-07
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Expires: 1991-04-26
Abstract
Abstract THE PRESENT INVENTION RELATES TO A PROCESS FOR PREPARING ANALOGUS OF CHLORAMPHENICOL, CHARACTERIZED BY CULTURING A MICROORGANISM CAPABLE OF PRODUCING D-THREO-2-PROPINOAMIDO-1-P-NITROPHENYL-1,3-PROPANEDIOL (HEREINAFTER DESIGNATED AS SUBSTANCE A) AND/OR D-THREO-2-ISOBUTYRAMIDO-1-P-NITROPHENYL-1,3-PROPANEDIOL (HEREINAFTER DESIGNATED AS SUBSTANCE B), UNDER AEROBIC CONDITIONS IN A CULTURE MEDIUM CONTAINING ASSIMILABLE CARBON SOURCES TO FORM AND ACCUMULATE SAID ANALOGUES OF CHLORAMPHENICOL THEREIN AND ISOLATING AND RECOVERING THE SAME THEREFROM.
Inventors
- 👤 T Suzuki
- 👤 H Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:35
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/83; Y10S435/843; Y10S435/872
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |