Patent US2645640A successfully refreshed from Google Patents.
US2645640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenthiazine derivatives
Assignee: —
•
Filing: —
•
Granted: 1953-07-14
•
Expires: 1970-07-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
C; C07; C07D; C07D279/00; C07D279/10; C07D279/14; C07D279/18; C07D279/22; C07D279/24; C07D279/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A MEMBER OF THE CLASS CONSISTING OF PHENTHIAZINE DERIVATIVES HAVING THE BASIC STRUCTURAL FORMULA:
Claim 2
Dependent Claim
14 words
A MEMBER OF THE CLASS CONSISTING OF PHENTHIAZINE DERIVATIVES HAVING THE BASIC STRUCTURAL FORMULA:
References Cited (Backward Citations)
US2512520A
Cited
US2534237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |