US2564609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing ryanodine
Assignee: Merck and Co Inc
•
Filing: 1947-09-18
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Granted: 1951-08-14
•
Expires: 1967-09-18
Abstract
No abstract record available.
Inventors
- 👤 Edward F Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:00
CPC Classifications
A; A01; A01N; A01N65/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE PROCESS THAT COMPRISES EXTRACTING IN AQUEOUS SOLUTION OF RYANIA EXTRACTIVES WITH ETHER, EVAPORATING THE ETHER EXTRACT TO DRYNESS IN VACUO FORMING AN AMORPHOUS RESIDUE, DISSOLVING THE RESIDUE IN A SOLVENT OF THE CLASS CONSISTING OF ACETONE AND ETHER AND CRYSTALIZING OUT CRUDE RYANODINE, AND PURIFYING THE CRUDE RYANODINE BY RECRYSTALLIZATION FROM ETHER UNTIL THE CRYSTALLINE PRODUCT OBTAINED HAS A CONSISTENT MELTING POINT OF 219-220* C.
Claim 2
Dependent Claim
66 words
THE PROCESS THAT COMPRISES EXTRACTING IN AQUEOUS SOLUTION OF RYANIA EXTRACTIVES WITH ETHER, EVAPORATING THE ETHER EXTRACT TO DRYNESS IN VACUO FORMING AN AMORPHOUS RESIDUE, DISSOLVING THE RESIDUE IN A SOLVENT OF THE CLASS CONSISTING OF ACETONE AND ETHER AND CRYSTALIZING OUT CRUDE RYANODINE, AND PURIFYING THE CRUDE RYANODINE BY RECRYSTALLIZATION FROM ETHER UNTIL THE CRYSTALLINE PRODUCT OBTAINED HAS A CONSISTENT MELTING POINT OF 219-220* C.
References Cited (Backward Citations)
US2400295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |