Patent US3326918A successfully refreshed from Google Patents.
US3326918A
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Process for the preparation of beta phase quinacridone
Assignee: Novartis Corp
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Filing: 1965-10-21
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Granted: 1967-06-20
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 William A West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:52
CPC Classifications
C; C09; C09B; C09B48/00; C09B67/00; C09B67/0025; C09B67/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR THE PREPARATION OF BETA PHASE LINEAR QUINACRIDONE OF SPECIFIC SURFACE GREATER THAN 50 SQUARE METERS PER GRAM COMPRISING: (A) DISSOLVING QUINACRIDONE IN SULFURIC ACID, (B) CONTACTING THE SOLUTION OF STEP (A) WITH 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) CONTACTING THE SOLUTION OF STEP (B) WITH WATER, AND (D) PROCESSING AT A TEMPERATURE OF AT LEAST 80*C.
Claim 2
Dependent Claim
84 words
A PROCESS FOR THE PREPARATION OF BETA PHASE LINEAR QUINACRIDONE OF SPECIFIC SURFACE GREATER THAN 50 SQUARE METERS PER GRAM COMPRISING: (A) DISSOLVING QUINACRIDONE IN SULFURIC ACID, (B) CONTACTING THE SOLUTION OF STEP (A) WITH 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) CONTACTING THE SOLUTION OF STEP (B) WITH WATER, AND (D) PROCESSING AT A TEMPERATURE OF AT LEAST 80*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |