Patent US2969366A successfully refreshed from Google Patents.
US2969366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of quinacridones
Assignee: EIDP Inc
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Filing: 1958-02-11
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Granted: 1961-01-24
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Expires: 1978-02-11
Abstract
No abstract record available.
Inventors
- 👤 Paul H Griswold
- 👤 Ehrich Felix Frederick
- 👤 William S Struve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:15
CPC Classifications
C; C09; C09B; C09B48/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METHOD FOR CONVERTING 6,13-DIHYDROQUINACRIDONE TO QUINACRIDONE HAVING A CRYSTAL PHASE SELECTED FROM THE GROUP CONSISTING OF THE BETA CRYSTAL PHASE AND THE GAMMA CRYSTAL PHASE, COMPRISING OXIDIZING THE DIHYDROQUINACRIDONE WITH A MILD, ALKALI-STABLE OXICIZING THE DIHYDROQUINACRIFROM THE GROUP CONSISTING OF NITROBENZEN-M-SODIUM SULFONATE, AIR, AND SODIUM POLYSULFIDE WHILE PARTICALLY SUSPENDED IN AND PARTIALLY DISSOLVED IN A MIXTURE OF WATER, A POLAR, ALKALI-STABLE, WATER-SOLUBLE ORGAINC SOLVENT AND AN ALKALI SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, LITHIUM HYDROXIDE, BARIUM HYDROXIDE, AND MIXTURES THEREOF, IN AN AMOUNT OF ABOUT 20-120 PARTS OF SAID ALKALI PER 100 PARTS OF WATER AND AT LEAST 5 PARTS OF SAID ALKALI PER 100 PARTS OF TOTAL LIQUID USED, AND THE AMOUND OF ORGANIC SOLVENT IS AT LEAST AS MUCH AS THE WATER, AND RECOVERING QUINACRIDONE FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
136 words
A METHOD FOR CONVERTING 6,13-DIHYDROQUINACRIDONE TO QUINACRIDONE HAVING A CRYSTAL PHASE SELECTED FROM THE GROUP CONSISTING OF THE BETA CRYSTAL PHASE AND THE GAMMA CRYSTAL PHASE, COMPRISING OXIDIZING THE DIHYDROQUINACRIDONE WITH A MILD, ALKALI-STABLE OXICIZING THE DIHYDROQUINACRIFROM THE GROUP CONSISTING OF NITROBENZEN-M-SODIUM SULFONATE, AIR, AND SODIUM POLYSULFIDE WHILE PARTICALLY SUSPENDED IN AND PARTIALLY DISSOLVED IN A MIXTURE OF WATER, A POLAR, ALKALI-STABLE, WATER-SOLUBLE ORGAINC SOLVENT AND AN ALKALI SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, LITHIUM HYDROXIDE, BARIUM HYDROXIDE, AND MIXTURES THEREOF, IN AN AMOUNT OF ABOUT 20-120 PARTS OF SAID ALKALI PER 100 PARTS OF WATER AND AT LEAST 5 PARTS OF SAID ALKALI PER 100 PARTS OF TOTAL LIQUID USED, AND THE AMOUND OF ORGANIC SOLVENT IS AT LEAST AS MUCH AS THE WATER, AND RECOVERING QUINACRIDONE FROM THE REACTION MIXTURE.
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) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |