Patent US2562715A successfully refreshed from Google Patents.
US2562715A
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Extraction of penicillin
Assignee: Wyeth LLC
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Filing: 1944-02-26
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Granted: 1951-07-31
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Expires: 1964-02-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles W Heathcote
- 👤 Granville R Rettew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:57
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/41; A61K31/425; A61K31/429; A61K31/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN THE PROCESS OF EXTRACTING PENICILLIN FROM A CRUDE ACIDIC AQUEOUS CULTURE LIQUID WITH A WATER-IMMISCIBLE ORGANIC SOLVENT, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE EXTRACTION IN THE PRESENCE OF A SMALL AMOUNT OF A LONGCHAIN-ALKYL TRIMETHYL AMMONIUM BROMIDE, AS A DEMULSIFIER, THUS ACCELERATING SEPARATION OF THE ORGANIC SOLVENT EXTRACT FROM THE AQUEOUS PHASE, AND SEPARATING THE RESULTNG ORGANIC SOLVENT EXTRACT FROM THE AQUEOUS PHASE.
Claim 2
Dependent Claim
65 words
IN THE PROCESS OF EXTRACTING PENICILLIN FROM A CRUDE ACIDIC AQUEOUS CULTURE LIQUID WITH A WATER-IMMISCIBLE ORGANIC SOLVENT, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE EXTRACTION IN THE PRESENCE OF A SMALL AMOUNT OF A LONGCHAIN-ALKYL TRIMETHYL AMMONIUM BROMIDE, AS A DEMULSIFIER, THUS ACCELERATING SEPARATION OF THE ORGANIC SOLVENT EXTRACT FROM THE AQUEOUS PHASE, AND SEPARATING THE RESULTNG ORGANIC SOLVENT EXTRACT FROM THE AQUEOUS PHASE.
References Cited (Backward Citations)
US1938322A
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US1938323A
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US1943815A
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US2262238A
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US2281419A
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US2262741A
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US2338384A
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US2448790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |