US2538005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogenated derivatives of the naphthoquinone-imine series and a process for their manufacture
Assignee: Sandoz AG
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Filing: 1948-06-22
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Granted: 1951-01-16
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Expires: 1968-06-22
Abstract
No abstract record available.
Inventors
- 👤 Kartaschoff Valentin
- 👤 Merian Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
C; C09; C09B; C09B13/00; C09B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS FOR THE MANUFACTURE OF A HALOGENATED 5.8-DIHYDROXY-1.4-NAPHTHOQUINONE-IMINE(1) WHICH COMPRISES THE STEP OF SUBJECTING A HALOGENATED 5 - AMINO - 8 - HYDROXY - 1.4 - NAPHTHOQUINONE-IMINE-(1) TO HYDROLYSIS IN AN ACID MEDIUM.
Claim 2
Dependent Claim
34 words
A PROCESS FOR THE MANUFACTURE OF A HALOGENATED 5.8-DIHYDROXY-1.4-NAPHTHOQUINONE-IMINE(1) WHICH COMPRISES THE STEP OF SUBJECTING A HALOGENATED 5 - AMINO - 8 - HYDROXY - 1.4 - NAPHTHOQUINONE-IMINE-(1) TO HYDROLYSIS IN AN ACID MEDIUM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |