US3110711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing two escin isomers from horse chestnut extracts, and products
Assignee: Astellas Deutschland GmbH
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Filing: 1961-06-13
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Granted: 1963-11-12
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Expires: 1981-06-13
Abstract
No abstract record available.
Inventors
- 👤 Wagner Josef
- 👤 Bosse Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:25
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/24; C07H15/256
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
SUBSTANTIALLY PURE A-ESCIN OF THE MELTING POINT 225227*C., SAID A-ESCIN BEING A WHITE AMORPHOUS POWDER, HAVING AN OPTICAL ROTATION (A)D25 OF -13.5* (CONCENTRATION: 5% IN ABSOLUTE METHANOL) AND A HEMOLYTIC INDEX OF 1:20,000, BEING READILY SOLUBLE IN WATER AND METHANOL, ONLY SLIGHTLY SOLUBLE IN ACETONE, AND INSOLUBLE INETHE AND HYDROCARBONS, ITS SODIUM SALT HAVING A MELTING POINT OF 250-252*C., SAID A-ESCIN CONTAINING ONE MOLE OF XYLOSE, ONE MOLE OF GLUCOSE, AND ONE MOLE OF GLUCORONIC ACID.
Claim 2
Dependent Claim
76 words
SUBSTANTIALLY PURE A-ESCIN OF THE MELTING POINT 225227*C., SAID A-ESCIN BEING A WHITE AMORPHOUS POWDER, HAVING AN OPTICAL ROTATION (A)D25 OF -13.5* (CONCENTRATION: 5% IN ABSOLUTE METHANOL) AND A HEMOLYTIC INDEX OF 1:20,000, BEING READILY SOLUBLE IN WATER AND METHANOL, ONLY SLIGHTLY SOLUBLE IN ACETONE, AND INSOLUBLE INETHE AND HYDROCARBONS, ITS SODIUM SALT HAVING A MELTING POINT OF 250-252*C., SAID A-ESCIN CONTAINING ONE MOLE OF XYLOSE, ONE MOLE OF GLUCOSE, AND ONE MOLE OF GLUCORONIC ACID.
Claim 3
Dependent Claim
68 words
IN A PROCESS OF PRODUCING TWO ESCIN ISOMERS FROM GENUINE HORSE CHESTNUT ESCIN, THE STEPS WHICH COMPRISE CONTACTING ESCIN IN AN AQUEOUS MEDIUM WITH A CATION EXCHANGE AGENT TO PRODUCE THE FREE ACID FORM THEREOF, HEATING ITS AQUEOUS SOLUTION AT A TEMPERATURE BETWEEN ABOUT 50*C. AND ABOUT 90*C. UNTIL PRECIPITATION OF BESCIN IS COMPLETED, SEPARATING THE PRECEIPITATED B-ESCIN FROM THE SOLUTION, AND DRYING SAID B-ESCIN UNDER MILD CONDITIONS.
Claim 4
Dependent Claim
68 words
IN A PROCESS OF PRODUCING TWO ESCIN ISOMERS FROM GENUINE HORSE CHESTNUT ESCIN, THE STEPS WHICH COMPRISE CONTACTING ESCIN IN AN AQUEOUS MEDIUM WITH A CATION EXCHANGE AGENT TO PRODUCE THE FREE ACID FORM THEREOF, HEATING ITS AQUEOUS SOLUTION AT A TEMPERATURE BETWEEN ABOUT 50*C. AND ABOUT 90*C. UNTIL PRECIPITATION OF BESCIN IS COMPLETED, SEPARATING THE PRECEIPITATED B-ESCIN FROM THE SOLUTION, AND DRYING SAID B-ESCIN UNDER MILD CONDITIONS.
References Cited (Backward Citations)
US2790793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-11 | 1967-05-13 | 1967-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-11 | 1971-05-13 | 1971-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-11 | 1975-05-13 | 1975-11-12 | $7700.00 | Window Closed / Lapsed |