US2683146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrahydroisoquinolinium derivatives and methods for their production
Assignee: GD Searle LLC
•
Filing: 1950-02-07
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Granted: 1954-07-06
•
Expires: 1970-02-07
Abstract
No abstract record available.
Inventors
- 👤 Richard A Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:10
CPC Classifications
C; C07; C07D; C07D217/00; C07D217/02; C07D217/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A 1 - ARALKYL-1,2,3,4-TETRAHYDRO-2,2-DIALKYL6,7-DIHYDROXYISOQUINOLINIUM SALT HAVING THE GENERAL STRUCTURAL FORMULA
Claim 2
Dependent Claim
10 words
A 1 - ARALKYL-1,2,3,4-TETRAHYDRO-2,2-DIALKYL6,7-DIHYDROXYISOQUINOLINIUM SALT HAVING THE GENERAL STRUCTURAL FORMULA
References Cited (Backward Citations)
US2223373A
Cited
FR868733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |