US2905668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenthiazine derivatives
Assignee: Rhone Poulenc SA
•
Filing: 1958-01-27
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Granted: 1959-09-22
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Expires: 1978-01-27
Abstract
No abstract record available.
Inventors
- 👤 Jacob Robert Michel
- 👤 Horclois Raymond Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:28
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/207; C07; C07D; C07D279/00; C07D279/10; C07D279/14; C07D279/18; C07D279/22; C07D279/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A MEMBER OF THE CLASS CONSISTING OF A PHENTHIAZINE DERIVATIVE OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
14 words
A MEMBER OF THE CLASS CONSISTING OF A PHENTHIAZINE DERIVATIVE OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2272498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |