US2676177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of optically active 3-methoxy-n-methyl morphinans and salts thereof
Assignee: F Hoffmann La Roche AG
•
Filing: 1950-10-27
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Granted: 1954-04-20
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Expires: 1970-10-27
Abstract
No abstract record available.
Inventors
- 👤 Schnider Otto
- 👤 Grussner Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
C; C07; C07D; C07D221/00; C07D221/02; C07D221/22; C07D221/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A PROCESS WHICH COMPRISES TREATING D.L-3HYDROXY-N-METHYL-MORPHINAN WITH AN OPTICALLY ACTIVE ACID TO FORM A MIXTURE OF OPTICALLY ACTIVE SALTS AND SEPARATING FROM SAID MIXTURE A SALT OF (+)-3-HYDROXY-N-METHYL-MORPHINAN WITH SAID ACID.
Claim 2
Dependent Claim
31 words
A PROCESS WHICH COMPRISES TREATING D.L-3HYDROXY-N-METHYL-MORPHINAN WITH AN OPTICALLY ACTIVE ACID TO FORM A MIXTURE OF OPTICALLY ACTIVE SALTS AND SEPARATING FROM SAID MIXTURE A SALT OF (+)-3-HYDROXY-N-METHYL-MORPHINAN WITH SAID ACID.
References Cited (Backward Citations)
US2524856A
Cited
US1100998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |