US2663709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-alkyl-6, 7-dihydroxy-1, 2, 3, 4-tetrahydroisoquinoline compounds
Assignee: Smith Kline & French Laboratories Ltd
•
Filing: 1950-08-15
•
Granted: 1953-12-22
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Expires: 1970-08-15
Abstract
No abstract record available.
Inventors
- 👤 Paul N Craig
- 👤 Fred P Nabenhauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:09
CPC Classifications
C; C07; C07D; C07D217/00; C07D217/02; C07D217/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A 1,2,3,4-TETRAHYDROISOQUINOLINE OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE FORMULA:
Claim 2
Dependent Claim
21 words
A 1,2,3,4-TETRAHYDROISOQUINOLINE OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE FORMULA:
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |