US2504875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing 4-hydroxyquinolines
Assignee: United States, WAR, Secretary of
•
Filing: 1945-06-04
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Granted: 1950-04-18
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Expires: 1965-06-04
Abstract
No abstract record available.
Inventors
- 👤 Charles C Price
- 👤 Royston M Roberts
- 👤 Harry F Herbrandson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:46
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/22; C07D215/233; C07D215/18; C07D215/36; C07D215/38; C07D215/40; C07D215/48; C07D215/54; C07D215/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
IN THE PREPARATION OF NUCLEAR SUBSTITUTED 4HYDROXYQUINOLINE COMPOUNDS, THE IMPROVEMENT WHICH COMPRISES HEATING TO A TEMPERATURE SUFFICIENT TO EFFECT RING-CLOSURE, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE SUBSTITUTED ACRYLATES AND THE CORRESPONDING ISOMERIC ANILS HAVING THE GENERAL FORMULAE.
Claim 2
Dependent Claim
40 words
IN THE PREPARATION OF NUCLEAR SUBSTITUTED 4HYDROXYQUINOLINE COMPOUNDS, THE IMPROVEMENT WHICH COMPRISES HEATING TO A TEMPERATURE SUFFICIENT TO EFFECT RING-CLOSURE, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE SUBSTITUTED ACRYLATES AND THE CORRESPONDING ISOMERIC ANILS HAVING THE GENERAL FORMULAE.
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) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |