US3544577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1 - pyridyl - 1,2,3,4 - tetrahydroisoquinoline substitution products and salts thereof
Assignee: Individual
•
Filing: 1967-06-07
•
Granted: 1970-12-01
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Expires: 1987-06-07
Abstract
No abstract record available.
Inventors
- 👤 Ernst Seeger
- 👤 Wolfhard Engel
- 👤 Helmut Teufel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:12
CPC Classifications
A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |