US2786077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desdimethylaminotetracyclines and process
Assignee: Pfizer Inc
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Filing: 1954-10-22
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Granted: 1957-03-19
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Expires: 1974-10-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles R Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:25
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
PROCESS FOR THE PREPARATION OF A MICROBIOLOGICALLY ACTIVE PRODUCT SELECTED FROM THE GROUP CONSISTING OF DESDIMETHYLAMINOTETRACYCLINE, DESDIMETHYLAMINOCHLORTETRACYCLINE, AND DESDIMETHYLAMINO-4-OXYTETRACYCLINE WHICH COMPRISES CONTACTING A TETRACYCLINE ANTIBIOTIC SELECTED FROM THE GROUP CONSISTING OF TETRACYCLINE, CHLORTETRACYCLINE, AND OXYTETRACYCLINE WITH METALLIC ZINC IN A MILDLY ACIDIC MEDIUM AT A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 40*C. FOR A TIME OF FROM ABOUT 2 TO ABOUT 10 HOURS, THE CONCENTRATON OF TETRACYCLINE ANTIBIOTIC BASED ON THE WEIGHT OF ACIDIC MEDIUM BEING FROM ABOUT 1 TO ABOUT 20 PERCENT BY WEIGHT, THERE BEING AT LEAST 1/2 PART BY WEIGHT OF ZINC PER PART BY WEIGHT OF TETRACYCLIEN ANTIOBIOTIC, AND RECOVERING RESULTING MICROBIOLOGICALLY ACTIVE PRODUCT.
Claim 2
Dependent Claim
109 words
PROCESS FOR THE PREPARATION OF A MICROBIOLOGICALLY ACTIVE PRODUCT SELECTED FROM THE GROUP CONSISTING OF DESDIMETHYLAMINOTETRACYCLINE, DESDIMETHYLAMINOCHLORTETRACYCLINE, AND DESDIMETHYLAMINO-4-OXYTETRACYCLINE WHICH COMPRISES CONTACTING A TETRACYCLINE ANTIBIOTIC SELECTED FROM THE GROUP CONSISTING OF TETRACYCLINE, CHLORTETRACYCLINE, AND OXYTETRACYCLINE WITH METALLIC ZINC IN A MILDLY ACIDIC MEDIUM AT A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 40*C. FOR A TIME OF FROM ABOUT 2 TO ABOUT 10 HOURS, THE CONCENTRATON OF TETRACYCLINE ANTIBIOTIC BASED ON THE WEIGHT OF ACIDIC MEDIUM BEING FROM ABOUT 1 TO ABOUT 20 PERCENT BY WEIGHT, THERE BEING AT LEAST 1/2 PART BY WEIGHT OF ZINC PER PART BY WEIGHT OF TETRACYCLIEN ANTIOBIOTIC, AND RECOVERING RESULTING MICROBIOLOGICALLY ACTIVE PRODUCT.
Claim 3
Dependent Claim
14 words
A BIOLOGICALLY ACTIVE DESDIMETHYLAMINOTETRACYCLINE COMPOUND CHOSEN FROM THE GROUP CONSISTING OF DESEIMETHYLAMINOCHLORTETRACYCLINE AND DESDIMETHYLAMINOTETRACYCLINE.
Claim 4
Dependent Claim
14 words
A BIOLOGICALLY ACTIVE DESDIMETHYLAMINOTETRACYCLINE COMPOUND CHOSEN FROM THE GROUP CONSISTING OF DESEIMETHYLAMINOCHLORTETRACYCLINE AND DESDIMETHYLAMINOTETRACYCLINE.
References Cited (Backward Citations)
US2482055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |