US3734952A
Expired / Lapsed
US
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Preparation of l-dopa
Assignee: F Hoffmann La Roche AG
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Filing: 1968-12-27
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Granted: 1973-05-22
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Expires: 1988-12-27
Abstract
Abstract THE PRESENT INVENTION RELATES TO A PROCESS FOR THE PREPARATION OF L-DOPA AND TO AN ARYL LOWER ALLKYLAMINE RESOLVING AGENT USABLE IN THIS PREPARATION.
Inventors
- 👤 A Krubiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:16
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/185; A61K31/19; A61K31/195; C; C07; C07D; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07D317/48; C07D317/50; C07D317/60; E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/30; E04C2/38
Claims Analysis
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |