US3238190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aescin recovery
Assignee: Madaus Holding GmbH
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Filing: 1963-10-23
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Granted: 1966-03-01
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Expires: 1983-10-23
Abstract
No abstract record available.
Inventors
- 👤 Erbring Hans
- 👤 Winkler Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:47
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/24; C07H15/256
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A METHOD OF PREPARING AESCIN OF THERAPEUTIC PURITY COMPRISING EXTRACTING HORSE CHESTNUT SEEDS WITH A 40 TO 60 PERCENT AQUEOUS SOLUTION OF A LOWER ALIPHATIC ALCOHOL, SEPARATING THE AESCIN CONTAINING SOLUTION FROM THE SOLID RESIDUE, CONTACTING SAID AQUEOUS-ALCOHOLIC SOLUTION WITH A CATION EXCHANGE RESIN IN THE HYDROGEN CYCLE, SEPARATING THE EFFLUENT SOLUTION FROM THE RESIN, PRECIPITATING AESCIN IN SAID SOLUTION, AND SEPARATING THE PRECIPITTED AESCIN FROM THE SOLUTION.
Claim 2
Independent Claim
68 words
A METHOD OF PREPARING AESCIN OF THERAPEUTIC PURITY COMPRISING EXTRACTING HORSE CHESTNUT SEEDS WITH A 40 TO 60 PERCENT AQUEOUS SOLUTION OF A LOWER ALIPHATIC ALCOHOL, SEPARATING THE AESCIN CONTAINING SOLUTION FROM THE SOLID RESIDUE, CONTACTING SAID AQUEOUS-ALCOHOLIC SOLUTION WITH A CATION EXCHANGE RESIN IN THE HYDROGEN CYCLE, SEPARATING THE EFFLUENT SOLUTION FROM THE RESIN, PRECIPITATING AESCIN IN SAID SOLUTION, AND SEPARATING THE PRECIPITTED AESCIN FROM THE SOLUTION.
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |