US3637804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenylalanine derivatives and preparation thereof
Assignee: F Hoffmann La Roche AG
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Filing: 1968-02-12
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Granted: 1972-01-25
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Expires: 1988-02-12
Abstract
Abstract COMPOUNDS OF THE FORMULA 1-(R1-CO-CH(-NH2)-CH2-),3,5-DI(HO-),4-(CH3-O-)BENZENE IN WHICH R1 IS HYDROXY, ALKOXY, OR A SUBSTIUTED OR UNSUBSTITUTED AMINO GROUP, OPTICAL ISOMERS (PREFERABLY THE L-ANTIPODES) THEREOF AND PHARMACEUTICALLY ACCEPTABLE SALTS THEREOF, USEFUL AS HYPOTENSIVE AGNETS, ALONG WITH METHODS FOR THEIR PREPARATION FROM THE APPROPRIATE PHENYLALANINE PRECURSOR, ARE DISCLOSED.
Inventors
- 👤 Balthasar Hegedus
- 👤 Paul Zeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:09
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/30; C07D263/34; C07D263/36; C07D263/42; C07C; C07C327/00
Claims Analysis
Total Claims: 0
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |