Patent US2837518A successfully refreshed from Google Patents.
US2837518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenthiazine compounds
Assignee: —
•
Filing: —
•
Granted: 1958-06-03
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Expires: 1975-06-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:24
CPC Classifications
C; C07; C07D; C07D279/00; C07D279/10; C07D279/14; C07D279/18; C07D417/00; C07D417/02; C07D417/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
19 words
A MEMBER OF THE CLASS CONSISTING OF THE RACEMIC AND OPTICALLY ACTIVE PHENTHIAZINE DERIVATIVES OF THE GENERAL PLANAR FORMULA:
References Cited (Backward Citations)
US2512520A
Cited
US2519886A
Cited
US2526118A
Cited
US2530451A
Cited
US2645640A
Cited
US2483998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |