Patent US3753994A successfully refreshed from Google Patents.
US3753994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,1'-azinobis(1,2,3,4-tetrahydroisoquinolines)
Assignee: STWB Inc
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Filing: 1970-08-10
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Granted: 1973-08-21
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Expires: 1990-08-10
Abstract
Abstract 1-(2-SUBSTITUTED-HYDRAZINO) - 3,4 - DIHYDROISOQUINOLINES, PREPARED IN ONE PROCESS BY ALKYLATING THE CORRESPONDING 3,4-DIHYDROISOCARBOSTYRILS, HYDRAZINOLYZING THE RESULTING 1-ALKOXY-3,4-DIHYDROISOQUINOLINES AND CONDENSING THE RESULTING 1-HYDRAZINO-3,4-DIHYDROISOQUINOLINES WITH ALDEHYDES OR KETONES, AND 1,1''-AZINOBIS(1,2,3,4-TETRAHYDROISOQUINOLINES), PREPARED BY CONDENSING CORRESPONDING 1ALKOXY-3,4-DIHYDROISOQUINOLINES AND 1-HYDRAZINO-3,4-DIHYDROISOQUINOLINES, ARE USEFUL AS ANTIHYPERTENSIVE AGENTS.
Inventors
- 👤 G Diana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:42
CPC Classifications
C; C07; C07D; C07D217/00; C07D217/22; C07D217/24; C07D307/00; C07D307/77; C07D307/87; C07D307/88; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07D317/48; C07D317/50; C07D317/58
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |