US2944058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing substituted carbazole derivatives
Assignee: Chemische Fabrik Promonta GmbH
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Filing: 1957-06-25
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Granted: 1960-07-05
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Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 Kallischnigg Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:51
CPC Classifications
C; C07; C07D; C07D401/00; C07D401/02; C07D401/04; A; A61; A61K; A61K31/00; C07D401/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A PROCESS FOR THE PREPARATION OF CARBAZOLE DERIVATIVES CONTAING BASIC AND CORRESPONDING TO THE GENERAL FORMULA
Claim 2
Dependent Claim
16 words
A PROCESS FOR THE PREPARATION OF CARBAZOLE DERIVATIVES CONTAING BASIC AND CORRESPONDING TO THE GENERAL FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |