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US2505568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic oxidation of heterocyclic aromatic nitrogen compounds
Assignee: Honeywell International Inc
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Filing: 1947-09-09
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Granted: 1950-04-25
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Expires: 1967-09-09
Abstract
No abstract record available.
Inventors
- 👤 Max B Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:17
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN THE CATALYTIC OXIDATION TO A PYRIDINE CARBOXYLIC ACID OF AN N-HETEROARYL COMPOUND CONTAINING A PYRIDINE NUCLEUS CONTAINING AN OXIDIZABLE ORGANIC GROUPING ATTACHED TO THE NITROGENCONTAINING AROMATIC NULEUS BY AT LEAST ONE CARBON-TO-CARBON LINKAGE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE OXIDATION BY REACTING NITRIC ACID WITH A CONCENTRATED SULFURIC ACID SOLUTION OF THE N-BETEROARYL COMPOUND AND BETWEEN ABOUT 0.5% AND ABOUT 25% BY WEIGHT, BASED ON THE N-HETEROARYL COMPOUND, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HALOGENS, HYDROGEN HALIDES, AND HALOGEN-CONTAINING COMPOUNDS WHICH REACT WITH SULFURIC ACID AT 50*C. TO YIELD A COMPOUND SELECTED FROM THE GROUP OF HALOGENS AND HYDROGEN HALIDES, WHILE MAINTAINING THE SOLUTION AT A TEMPERATURE BETWEEN ABOUT 100* AND 300*C., AND RECOVERING A COMPOUND CONTAINING THE PYRIDINE CARBOXYLIC ACID RADICAL.
Claim 2
Dependent Claim
126 words
IN THE CATALYTIC OXIDATION TO A PYRIDINE CARBOXYLIC ACID OF AN N-HETEROARYL COMPOUND CONTAINING A PYRIDINE NUCLEUS CONTAINING AN OXIDIZABLE ORGANIC GROUPING ATTACHED TO THE NITROGENCONTAINING AROMATIC NULEUS BY AT LEAST ONE CARBON-TO-CARBON LINKAGE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE OXIDATION BY REACTING NITRIC ACID WITH A CONCENTRATED SULFURIC ACID SOLUTION OF THE N-BETEROARYL COMPOUND AND BETWEEN ABOUT 0.5% AND ABOUT 25% BY WEIGHT, BASED ON THE N-HETEROARYL COMPOUND, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HALOGENS, HYDROGEN HALIDES, AND HALOGEN-CONTAINING COMPOUNDS WHICH REACT WITH SULFURIC ACID AT 50*C. TO YIELD A COMPOUND SELECTED FROM THE GROUP OF HALOGENS AND HYDROGEN HALIDES, WHILE MAINTAINING THE SOLUTION AT A TEMPERATURE BETWEEN ABOUT 100* AND 300*C., AND RECOVERING A COMPOUND CONTAINING THE PYRIDINE CARBOXYLIC ACID RADICAL.
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) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |