US2558211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 4-hydroxyquinoline compounds
Assignee: Eli Lilly and Co
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Filing: 1949-04-14
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Granted: 1951-06-26
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Expires: 1969-04-14
Abstract
No abstract record available.
Inventors
- 👤 Robert C Elderfield
- 👤 Allison D Maggiolo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:34
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/22; C07D215/233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE PROCESS OF PREPARING A 4-HYDROXYQUINOLINE COMPOUND WHICH COMPRISES DEHYDROGENATING A 4-KETO-1,2,3,4-TETRAHYDROQUINOLINE COMPOUND BY HEATING THE TETRAHYDORQUINOLINE COMPOUND WITH PALLADIUM BLACK AND A HYDROGEN ACCEPTOR OF THE GROUP CONSISTING OF MALEIC ACID, FUMARIC ACID AND NITROBENZENE, AND ISOLATING THE 4-HYDROXYQUINOLINE COMPOUND.
Claim 2
Dependent Claim
41 words
THE PROCESS OF PREPARING A 4-HYDROXYQUINOLINE COMPOUND WHICH COMPRISES DEHYDROGENATING A 4-KETO-1,2,3,4-TETRAHYDROQUINOLINE COMPOUND BY HEATING THE TETRAHYDORQUINOLINE COMPOUND WITH PALLADIUM BLACK AND A HYDROGEN ACCEPTOR OF THE GROUP CONSISTING OF MALEIC ACID, FUMARIC ACID AND NITROBENZENE, AND ISOLATING THE 4-HYDROXYQUINOLINE COMPOUND.
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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |