US3021334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for n-methylacridone
Assignee: —
•
Filing: —
•
Granted: 1962-02-13
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Expires: 1979-02-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
C; C07; C07D; C07D219/00; C07D219/04; C07D219/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A METHOD FOR PREPARING N-METHYLACARIDONE FROM N-PHENYLANTHRANILIC ACID, THE IMPROVEMENT COMPRISING REACTING A MOLE OF N-PHENYLANTHRANILIC ACID WITH ABOUT 2 MOLES OF PHOSPHORUS OXYCHLORIDE IN CHLOROBENZENE, HEATING THE REACTION MIXTURES AT AN INITIAL TEMPERATURE OF 55-60*C. UNTIL FORMATION OF ACRIDONE IS SUBSTANTIALLY COMPLETE, THEREAFTER INCREASING THE TEMPERATURE OF THE REACTION MIXTURE TO 95-100*C. UNTIL FORMATION OF 9-CHLOROACRIDINE IS SUBSTANTIALLY COMPLETE, SEPARATING THE SOLVENT LAYER AND ADDING THERETO A METHYL QUATERNIZING AGENT, EXTRACTING SAID QUATERNARY SALT OF 9-CHLOROACRIDINE WITH WATER AND TREATING SAID WATER EXTRACTION WITH MINERAL ACID TO OBTAIN N-METHYLACRIDONE.
Claim 2
Dependent Claim
91 words
IN A METHOD FOR PREPARING N-METHYLACARIDONE FROM N-PHENYLANTHRANILIC ACID, THE IMPROVEMENT COMPRISING REACTING A MOLE OF N-PHENYLANTHRANILIC ACID WITH ABOUT 2 MOLES OF PHOSPHORUS OXYCHLORIDE IN CHLOROBENZENE, HEATING THE REACTION MIXTURES AT AN INITIAL TEMPERATURE OF 55-60*C. UNTIL FORMATION OF ACRIDONE IS SUBSTANTIALLY COMPLETE, THEREAFTER INCREASING THE TEMPERATURE OF THE REACTION MIXTURE TO 95-100*C. UNTIL FORMATION OF 9-CHLOROACRIDINE IS SUBSTANTIALLY COMPLETE, SEPARATING THE SOLVENT LAYER AND ADDING THERETO A METHYL QUATERNIZING AGENT, EXTRACTING SAID QUATERNARY SALT OF 9-CHLOROACRIDINE WITH WATER AND TREATING SAID WATER EXTRACTION WITH MINERAL ACID TO OBTAIN N-METHYLACRIDONE.
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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |