US2562715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of penicillin
Assignee: Wyeth LLC
•
Filing: 1944-02-26
•
Granted: 1951-07-31
•
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 15:48
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
Cited
US1938323A
Cited
US1943815A
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US2262238A
Cited
US2281419A
Cited
US2262741A
Cited
US2338384A
Cited
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 |