US3188348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
12alpha-deoxytetracycline oxidation process
Assignee: Pfizer Inc
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Filing: 1962-07-09
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Granted: 1965-06-08
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Expires: 1982-07-09
Abstract
No abstract record available.
Inventors
- 👤 Butler Kenneth
- 👤 Robert B Woodward
- 👤 Philip N Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:10
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE PROCESS WHICH COMPRISES CONTACTING METAL CHELATE OF A 12A-DEOXYTETRACYCLINE WITH AN OXIDIZING SUBSTANCE IN A REACTION INERT SOLVENT, THE PH IN AN AQUEOUS REACTION-INERT SOLVENT SYSTEM BEING FROM ABOUT 2 TO ABOUT 11, SAID METAL OF SAID CHELATE BEING SELECTED FROM THE GROUP CONSISTING OF THOSE IN GROUPS IB, IIB, IIIB, IVB, VB, VIB, VIIB, VIII, IIA, IIIA AND IVA OF THE PERIODIC CHART OF THE ELEMENTS, SAID OXIDIZING SUBSTANCE BEING SELECTED FROM THE GROUP CONSISTING OF AIR, OXYGEN, HYDROGEN, PEROXIDE, ALKALI METAL PEROXIDES AND N-OXIDES OF HYDROCARBON TERTIARY AMINES, AND SAID 12A-DEOXYTETRACYCLINE BEING SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
101 words
THE PROCESS WHICH COMPRISES CONTACTING METAL CHELATE OF A 12A-DEOXYTETRACYCLINE WITH AN OXIDIZING SUBSTANCE IN A REACTION INERT SOLVENT, THE PH IN AN AQUEOUS REACTION-INERT SOLVENT SYSTEM BEING FROM ABOUT 2 TO ABOUT 11, SAID METAL OF SAID CHELATE BEING SELECTED FROM THE GROUP CONSISTING OF THOSE IN GROUPS IB, IIB, IIIB, IVB, VB, VIB, VIIB, VIII, IIA, IIIA AND IVA OF THE PERIODIC CHART OF THE ELEMENTS, SAID OXIDIZING SUBSTANCE BEING SELECTED FROM THE GROUP CONSISTING OF AIR, OXYGEN, HYDROGEN, PEROXIDE, ALKALI METAL PEROXIDES AND N-OXIDES OF HYDROCARBON TERTIARY AMINES, AND SAID 12A-DEOXYTETRACYCLINE BEING SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
US3043877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |