US2571679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing purified heparin
Assignee: Pfizer Italia SRL
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Filing: 1948-07-08
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Granted: 1951-10-16
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Expires: 1968-07-08
Abstract
No abstract record available.
Inventors
- 👤 Butturini Luigi
- 👤 Bernini Giuseppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:54
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/70; A61K31/715
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR THE PREPARATION OF HEPARIN, COMPRISING EXTRACTION FROM AUTOLYZED OX LUNG WITH SOLUTION OF SODIUM HYDROXIDE AND AMMONIUM CHLORIDE, ACIDIFYING SUCH EXTRACT TO CAUSE PRECIPITATION, WASHING THE SO OBTAINED PRECITATE WITH A VOLATILE SOLVENT AND DRYING IT, TREATING THE DRIED RESIDUE WITH AN ALKALINE SOLUTION, FILTERING THE SUSPENSION THUS OBTAINED, ACIDIFYING THE FILTERED SOLUTION TO OBTAIN A PRECIPITATE, SUBJECTING SAID LAST MENTIONED PRECIPITATE TO DIGESTION WITH TRYPSIN, PRECIPITATING HEPARIN WITH ALCOHOL AND SEPARATING THE HEPARIN BY FILTRATION.
Claim 2
Dependent Claim
79 words
A PROCESS FOR THE PREPARATION OF HEPARIN, COMPRISING EXTRACTION FROM AUTOLYZED OX LUNG WITH SOLUTION OF SODIUM HYDROXIDE AND AMMONIUM CHLORIDE, ACIDIFYING SUCH EXTRACT TO CAUSE PRECIPITATION, WASHING THE SO OBTAINED PRECITATE WITH A VOLATILE SOLVENT AND DRYING IT, TREATING THE DRIED RESIDUE WITH AN ALKALINE SOLUTION, FILTERING THE SUSPENSION THUS OBTAINED, ACIDIFYING THE FILTERED SOLUTION TO OBTAIN A PRECIPITATE, SUBJECTING SAID LAST MENTIONED PRECIPITATE TO DIGESTION WITH TRYPSIN, PRECIPITATING HEPARIN WITH ALCOHOL AND SEPARATING THE HEPARIN BY FILTRATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |