US3019260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the catalytic reduction of 6-hydroxy hydronaphthacenes
Assignee: Wyeth Holdings LLC
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Filing: 1959-05-13
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Granted: 1962-01-30
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Expires: 1979-05-13
Abstract
No abstract record available.
Inventors
- 👤 Mccormick Jerry Robert Daniel
- 👤 Jensen Elmer Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:21
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
A PROCESS OF PREPARING A 6-DEXYTETRACYCLINE WHICH COMPRISES REDUCING A POLAR SOLVENT SOLUTIOIN OF A TETRACYCLINE ANTIBIOTIC SELECTED FROM THE GROUP CONSISTING OF TETRACYCLINE, 7-CHLOROTETRACYCLINE, 7-BROMOTETRACYCLINE, 5HYDROXYTETRACYCLINE, 6-DEMETHYLTETRACYCLINE, 7-CHLORO-6DEMETHYLTETRACYCLINE AND 7-BROMO-6-DEMETHYLTETRACYCLINE WITH HYDROGEN IN THE PRESENCE OF A FINELY-DIVIDED RHODIUM CATALYST UNTIL ABOUT TWO MOLES OF HYDROGEN HAVE BEEN ABSORBED FOR EACH MOLE OF STARTING MATERIAL USED WHEN THE STARTING MATERIAL IS A NUMBER OF THE GROUP CONSISTING OF 7-CHLOROTETRACYCLINE, 7-BROMOTETRACYCLINE, 7-CHLORO-6DEMETHYLTETRACYCLINE AND 7-BROMO-6-DEMETHYLTETRACYCLINE AND UNTIL ABOUT ONE MOLE OF HYDROGEN HAS BEEN ABSORBED FOR EACH MOLE OF STARTING MATERIAL USED WHEN THE STARTING MATERIAL IS A MEMBER OF THE GROUP CONSISTING OF TETRACYCLINE, 5-HYDROXYTETRACYCLINE AND 6-DEMETHYLTETRACYCLINE, AND RECOVERING THE 6-DEOXYTETRACYCLINE SO FORMED.
References Cited (Backward Citations)
US2731497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-29 | 1965-07-31 | 1966-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-29 | 1969-07-31 | 1970-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-29 | 1973-07-31 | 1974-01-30 | $7700.00 | Window Closed / Lapsed |