US2951082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted thiaxanthenes
Assignee: Merck and Co Inc
•
Filing: 1956-07-09
•
Granted: 1960-08-30
•
Expires: 1976-07-09
Abstract
No abstract record available.
Inventors
- 👤 James M Sprague
- 👤 Edward L Engelhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:34
CPC Classifications
C; C07; C07D; C07D335/00; C07D335/04; C07D335/10; C07D335/12; C07D335/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
THIAXANTHENE COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS HAVING THE GENERAL STRUCTURAL FORMULA
Claim 2
Dependent Claim
14 words
THIAXANTHENE COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS HAVING THE GENERAL STRUCTURAL FORMULA
References Cited (Backward Citations)
US2368006A
Cited
US2676971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |