US3337409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of heparin
Assignee: Dart Industries Inc
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Filing: 1963-11-20
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Granted: 1967-08-22
•
Expires: 1983-11-20
Abstract
No abstract record available.
Inventors
- 👤 Robert E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:39
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/70; A61K31/715
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD OF RECOVERING HEPARIN WHICH COMPRISES TREATING A HEPARIN-CONTAINING MATERIAL IN AN AQUEOUS MEDIUM AT A PH BETWEEN ABOUT 4 AND ABOUT 10 WITH A CROSSLINKED COPOLYMER OF A MIXTURE OF AN AROMATIC MONOVINYL HYDROCARBON AND AN AROMATIC DIVINYL HYDROCARBON, SAID MIXTURE CONAINING 96 TO 99.9 MOLE PERCENT OF SAID MONOVINYL HYDROCARBON AND 4 TO 0.1 MOLE PERCENT OF SAID DIVINYL HYDROCARBON, AID COPOLYMER BEARING ON THE AROMATIC NUCLEI SUBSTITUENT GROUPS OF THE FORMULA
Claim 2
Independent Claim
75 words
A METHOD OF RECOVERING HEPARIN WHICH COMPRISES TREATING A HEPARIN-CONTAINING MATERIAL IN AN AQUEOUS MEDIUM AT A PH BETWEEN ABOUT 4 AND ABOUT 10 WITH A CROSSLINKED COPOLYMER OF A MIXTURE OF AN AROMATIC MONOVINYL HYDROCARBON AND AN AROMATIC DIVINYL HYDROCARBON, SAID MIXTURE CONAINING 96 TO 99.9 MOLE PERCENT OF SAID MONOVINYL HYDROCARBON AND 4 TO 0.1 MOLE PERCENT OF SAID DIVINYL HYDROCARBON, AID COPOLYMER BEARING ON THE AROMATIC NUCLEI SUBSTITUENT GROUPS OF THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |