US3148191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing quinacridone pigments
Assignee: EIDP Inc
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Filing: 1962-11-02
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Granted: 1964-09-08
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Expires: 1982-11-02
Abstract
No abstract record available.
Inventors
- 👤 Jackson Julius
- 👤 William J Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:05
CPC Classifications
C; C09; C09B; C09B48/00; C09B67/00; C09B67/0033; C09B67/0034; C09B67/0036
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR IMPROVING THE PIGMENT PROPERTIES OF A QUINACRIDONE COMPRISING (1) MILLING THE QUINACRIDONE WITH ANHYDROUS ALUMINUM CHLORIDE TO EFFECT CHEMICAL ASSOCIATION THEREWITH, (2) REGENERATING THE QUINACRIDONE BY MIXING THE PRODUCT FROM SAID MILLING STEP WITH A LIQUID ELECTRON-DONOR SOLVENT SELECTED FROM THE GROUP CONSISTING OF WATER, DILUTE MINERAL ACIDS, ACETIC ACID-WATER MIXTURES, ALCOHOLS WITH UP TO 3 CARBON ATOMS, N-ALKYL SUBSTITUTED AMIDES, ALKYL SULFOXIDES AND ALKYL SULFONES, THE ALKYL SUBSTITUENTS CONTAINING UP TO 3 CARBON ATOMS, (3) SEPARATING WATER-SOLUBLE CONSTITUENTS FROM THE QUINACRIDONE BY WASHING THEM OUT WITH WATER, AND (4) RECOVERING THE QUINACRIDONE.
Claim 2
Dependent Claim
96 words
A PROCESS FOR IMPROVING THE PIGMENT PROPERTIES OF A QUINACRIDONE COMPRISING (1) MILLING THE QUINACRIDONE WITH ANHYDROUS ALUMINUM CHLORIDE TO EFFECT CHEMICAL ASSOCIATION THEREWITH, (2) REGENERATING THE QUINACRIDONE BY MIXING THE PRODUCT FROM SAID MILLING STEP WITH A LIQUID ELECTRON-DONOR SOLVENT SELECTED FROM THE GROUP CONSISTING OF WATER, DILUTE MINERAL ACIDS, ACETIC ACID-WATER MIXTURES, ALCOHOLS WITH UP TO 3 CARBON ATOMS, N-ALKYL SUBSTITUTED AMIDES, ALKYL SULFOXIDES AND ALKYL SULFONES, THE ALKYL SUBSTITUENTS CONTAINING UP TO 3 CARBON ATOMS, (3) SEPARATING WATER-SOLUBLE CONSTITUENTS FROM THE QUINACRIDONE BY WASHING THEM OUT WITH WATER, AND (4) RECOVERING THE QUINACRIDONE.
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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |