US2763681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlortetracycline, purification and alkaline earth salts
Assignee: Wyeth Holdings LLC
•
Filing: 1953-06-25
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Granted: 1956-09-18
•
Expires: 1973-06-25
Abstract
No abstract record available.
Inventors
- 👤 Starbird Edward Everett
- 👤 Pidacks Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:46
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A PROCESS FOR THE HARVESTING OF CHLORTETRACYCLINE CONTAINING MASH COMPRISES ACIDFYING THE MASH TO A PH OF LESS THAN ABOUT 3, SEPARATING AND REMOVING THE SOLIDS, INCREASING THE PH OF THE RESULTANT LIQUID TO BETWEEN ABOT 6 AND 10 IN THE PRESENCE OF, PER MOL OF CHLORTETRACYCLINE, AT LEAST ABOUT ONE EQUIVALENT OF ALKALINE EARTH METAL IONS SELECTED FROM THE GROUP CONSISTING OF CALCIUM IONS, BARIUM IONS, STRONTIUM IONS, AND MAGNESIUM IONS; AND SEPARATING THE RESULTANT PRECIPITATE OF CHLORTETRACYCLINE AS A SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, STRONTIUM AND MAGNESIUM.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE HARVESTING OF CHLORTETRACYCLINE CONTAINING MASH COMPRISES ACIDFYING THE MASH TO A PH OF LESS THAN ABOUT 3, SEPARATING AND REMOVING THE SOLIDS, INCREASING THE PH OF THE RESULTANT LIQUID TO BETWEEN ABOT 6 AND 10 IN THE PRESENCE OF, PER MOL OF CHLORTETRACYCLINE, AT LEAST ABOUT ONE EQUIVALENT OF ALKALINE EARTH METAL IONS SELECTED FROM THE GROUP CONSISTING OF CALCIUM IONS, BARIUM IONS, STRONTIUM IONS, AND MAGNESIUM IONS; AND SEPARATING THE RESULTANT PRECIPITATE OF CHLORTETRACYCLINE AS A SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, STRONTIUM AND MAGNESIUM.
Claim 3
Dependent Claim
39 words
A CALCIUM SALT OF CHLORTETRACYCLINE, SAID SALT BEING THE PRODUCT WHICH PRECIPITATES FROM AN AQUEOUS SOLUTION CONTAINING CHLORTETRACYCLINE AND AT LEAST ABOUT ONE EQUIVALENT OF CALCIUM IONS WHEN THE PH OS SAID SOLUTION IS RAISED TO ABOVE PH 6.
Claim 4
Dependent Claim
39 words
A CALCIUM SALT OF CHLORTETRACYCLINE, SAID SALT BEING THE PRODUCT WHICH PRECIPITATES FROM AN AQUEOUS SOLUTION CONTAINING CHLORTETRACYCLINE AND AT LEAST ABOUT ONE EQUIVALENT OF CALCIUM IONS WHEN THE PH OS SAID SOLUTION IS RAISED TO ABOVE PH 6.
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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |