Patent US2931810A successfully refreshed from Google Patents.
US2931810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenothiazine derivatives
Assignee: —
•
Filing: —
•
Granted: 1960-04-05
•
Expires: 1977-04-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:12
CPC Classifications
C; C07; C07D; C07D279/00; C07D279/10; C07D279/14; C07D279/18; C07D417/00; C07D417/02; C07D417/04; C07D417/12; C07D417/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF FREE BASES OF THE GENERAL FORMULA
Claim 2
Dependent Claim
14 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF FREE BASES OF THE GENERAL FORMULA
References Cited (Backward Citations)
US2534237A
Cited
US2629719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |