US2552507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification and fractionation of heparin preparations
Assignee: ER Squibb and Sons LLC
•
Filing: 1949-05-24
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Granted: 1951-05-15
•
Expires: 1969-05-24
Abstract
No abstract record available.
Inventors
- 👤 O'keeffe Andrew Ellis
- 👤 James A Shannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:55
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0063; C08B37/0075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
THE METHOD OF PURIFYING HEPARIN PREPARATIONS, WHICH ESSENTIALLY COMPRISES INTIMATELY CONTACTING AN AQUEOUS SOLUTION OF AN IMPURE HEPARIN PREPARATION WITH A SOLUTION OF A LONG-CHAIN ALIPHATIC AMINE IN A SUBSTANTIALLY WATER-IMMISCIBLE ORGANIC SOLVENT, SEPARATING THE ORGANIC-SOLVENT PHASE, AND RECOVERING A PURIFIED HEPARIN PREPARATION THEREFROM.
Claim 2
Independent Claim
44 words
THE METHOD OF PURIFYING HEPARIN PREPARATIONS, WHICH ESSENTIALLY COMPRISES INTIMATELY CONTACTING AN AQUEOUS SOLUTION OF AN IMPURE HEPARIN PREPARATION WITH A SOLUTION OF A LONG-CHAIN ALIPHATIC AMINE IN A SUBSTANTIALLY WATER-IMMISCIBLE ORGANIC SOLVENT, SEPARATING THE ORGANIC-SOLVENT PHASE, AND RECOVERING A PURIFIED HEPARIN PREPARATION THEREFROM.
References Cited (Backward Citations)
US2377016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |