US3140232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color stabilization of tetracycline compositions with polypropylene glycols
Assignee: Pfizer Inc
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Filing: 1962-12-19
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Granted: 1964-07-07
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Expires: 1982-12-19
Abstract
No abstract record available.
Inventors
- 👤 Melvin M Noseworthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:54
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/65
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A PHARMACEUTICAL COMPOSITION COMPRISING A TETRACYCLINE ANTIBIOTIC AS THE ESSENTIAL ACTIVE INGREDIENT, WHEREIN THE ANTIBIOTIC IS SELECTED FROM THE GROUP CONSISTING OF THE MAGNESIUM, CALCIUM AND ALUMINUM COMPLEXES OF TETRACYCLINE HAVING A MOLAR RATIO OF METAL ION TO TETRACYCLINE THAT IS ABOUT 3:1, AND THE MAGNESIUM, CALCIUM, ALUMINUM AND ZINC COMPLEXES OF OXYTETRACYCLINE HAVING A MOLAR RATIO OF METAL ION TO OXYTETRACYCLINE THAT IS IN THE RANGE OF ABOUT 1:3 TO ABOUT 3:1; AND AS A PHARMACEUTICALLY ACCEPTABLE CARRIER THEREFOR, A POLYPROPYLENE GLYCOL HAVING AN AVERAGE MOLEUCULAR WEIGHT THAT IS IN THE RANGE OF FROM ABOUT 2200 UP TO ABOUT 8200.
Claim 2
Dependent Claim
101 words
A PHARMACEUTICAL COMPOSITION COMPRISING A TETRACYCLINE ANTIBIOTIC AS THE ESSENTIAL ACTIVE INGREDIENT, WHEREIN THE ANTIBIOTIC IS SELECTED FROM THE GROUP CONSISTING OF THE MAGNESIUM, CALCIUM AND ALUMINUM COMPLEXES OF TETRACYCLINE HAVING A MOLAR RATIO OF METAL ION TO TETRACYCLINE THAT IS ABOUT 3:1, AND THE MAGNESIUM, CALCIUM, ALUMINUM AND ZINC COMPLEXES OF OXYTETRACYCLINE HAVING A MOLAR RATIO OF METAL ION TO OXYTETRACYCLINE THAT IS IN THE RANGE OF ABOUT 1:3 TO ABOUT 3:1; AND AS A PHARMACEUTICALLY ACCEPTABLE CARRIER THEREFOR, A POLYPROPYLENE GLYCOL HAVING AN AVERAGE MOLEUCULAR WEIGHT THAT IS IN THE RANGE OF FROM ABOUT 2200 UP TO ABOUT 8200.
Claim 3
Independent Claim
59 words
A METHOD FOR IMPROVING THE COLOR STABILITY OF A TETRACYCLING ANTIBIOTIC, WHICH COMPRISES CONTACTING THE ANTIBIOTIC WITH A LEAST ONE POLYPROPYLENE GLYCAL THAT IS IN THE MOLECULAR WEIGHT RANGE OF FROM ABOUT 2200 UP TO ABOUT 8200 AT A TEMPERATURE THAT IS IN THE RANGE OF FROM ABOUT 20*C. UP TO ABOUT 55*C., AND THEREAFTER RECOVERING THE SO-TREATED ANTIBIOTIC.
Claim 4
Independent Claim
59 words
A METHOD FOR IMPROVING THE COLOR STABILITY OF A TETRACYCLING ANTIBIOTIC, WHICH COMPRISES CONTACTING THE ANTIBIOTIC WITH A LEAST ONE POLYPROPYLENE GLYCAL THAT IS IN THE MOLECULAR WEIGHT RANGE OF FROM ABOUT 2200 UP TO ABOUT 8200 AT A TEMPERATURE THAT IS IN THE RANGE OF FROM ABOUT 20*C. UP TO ABOUT 55*C., AND THEREAFTER RECOVERING THE SO-TREATED ANTIBIOTIC.
References Cited (Backward Citations)
US2854378A
Cited
GB817182A
Cited
US3017323A
Cited
US2975099A
Cited
US3026248A
Cited
US3009956A
Cited
US2984686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |