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US3362957A
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Process for the production of gamma quinacridones
Assignee: Novartis Corp
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Filing: 1967-02-08
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Granted: 1968-01-09
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Expires: 1987-02-08
Abstract
No abstract record available.
Inventors
- 👤 William A West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:50
CPC Classifications
C; C09; C09B; C09B48/00; C09B67/00; C09B67/0025; C09B67/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR THE PREPARATION OF GAMMA PHASE LINEAR QUINACRIDONE OF SPECIFIC SURFACE GREATER THAN 50 SQUARE METERS PER GRAM COMPRISING: (A) DISSOLVING QUINACRIDONE IN SULFURIC ACID, (B) ADDING TO THE SOLUTION A COMPOUND HAVING THE FORMULA RX, WHEREIN R IS AN AROMATIC RADICAL SELECTED FROM THE GROUP CONSISTING OF PHENYL, TOLYL, XYLYL, AND NAPHTHYL, AND X IS HYDROGEN OR SULFONIC ACID, (C) ADDING TO THE SOLUTION 0.01 TO 0.10 PART OF QUINACRIDONE SULFONIC ACID PER PART OF QUINACRIDONE, (D) INTRODUCING SAID SOLUTION INTO A MIXTURE OF ACETIC ACID AND WATER THE PROPORTION OF ACETIC ACID IS FROM 0 TO 50%, AND (E) HEATING THE MIXTURE AT REFLUX TEMPERATURE.
Claim 2
Dependent Claim
109 words
A PROCESS FOR THE PREPARATION OF GAMMA PHASE LINEAR QUINACRIDONE OF SPECIFIC SURFACE GREATER THAN 50 SQUARE METERS PER GRAM COMPRISING: (A) DISSOLVING QUINACRIDONE IN SULFURIC ACID, (B) ADDING TO THE SOLUTION A COMPOUND HAVING THE FORMULA RX, WHEREIN R IS AN AROMATIC RADICAL SELECTED FROM THE GROUP CONSISTING OF PHENYL, TOLYL, XYLYL, AND NAPHTHYL, AND X IS HYDROGEN OR SULFONIC ACID, (C) ADDING TO THE SOLUTION 0.01 TO 0.10 PART OF QUINACRIDONE SULFONIC ACID PER PART OF QUINACRIDONE, (D) INTRODUCING SAID SOLUTION INTO A MIXTURE OF ACETIC ACID AND WATER THE PROPORTION OF ACETIC ACID IS FROM 0 TO 50%, AND (E) HEATING THE MIXTURE AT REFLUX TEMPERATURE.
References Cited (Backward Citations)
US3200122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-08 | 1971-07-10 | 1972-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-08 | 1975-07-10 | 1976-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-08 | 1979-07-10 | 1980-01-09 | $7700.00 | Window Closed / Lapsed |