US3264300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 9-dimethylquinacridone in a "yellow" crystalline form
Assignee: Wyeth Holdings LLC
•
Filing: 1964-09-15
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Granted: 1966-08-02
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Expires: 1984-09-15
Abstract
No abstract record available.
Inventors
- 👤 Kelly James Joseph
- 👤 Giambalvo Vito Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:08
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; C09B67/0027; C09B48/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
37 words
THE CRYSTALLINE POLYMORPH OF 2,9-DIMETHYLQUINACRIDONE CHARACTERIZED BY A "VERY YELLOW SHADE" OF RED COLOR DESIGNATED FORM III AND HAVING IN ITS X-RAY DIFFRACTION PATTERN A DISTINCTIVE MODERATE PEAK CORRESPONDING TO AN INTERPLANAR SPACING OF ABOUT 12.3 A.
Claim 2
Dependent Claim
37 words
THE CRYSTALLINE POLYMORPH OF 2,9-DIMETHYLQUINACRIDONE CHARACTERIZED BY A "VERY YELLOW SHADE" OF RED COLOR DESIGNATED FORM III AND HAVING IN ITS X-RAY DIFFRACTION PATTERN A DISTINCTIVE MODERATE PEAK CORRESPONDING TO AN INTERPLANAR SPACING OF ABOUT 12.3 A.
Claim 3
Dependent Claim
117 words
THE METHOD OF PREPARING THE CRYSTALLINE POLYMORPH OF 2,9-DIMETHYLQUINACRIDONE DEFINED IN CLAIM 2, WHICH COMPRISES GRINDING A MIXTURE OF (A) ONE PART OF A 2,9DIMETHYLQUINACRIDONE IN OTHER POLYMORPHIC FORM; (B) 2.25 TO 15.00 PARTS OF GRINDING AID CONSISTING OF AT LEAST ONE PART BY WEIGHT OF MICRO-ATOMIZED SALT, THE REMAINDER OF SAID GRINDING AIR BEING EXTRA-FINE FLAKE SATL; AND (C) ABOUT 0.50 TO 2 PARTS BY WEIGHT OF GLYCOL LIQUID AT THE GRINDING TEMPERATURE HAVING A MOLECULAR WEIGHT NOT HIGHER THAN ABOUT 600; SAID GRINDING BENG CONDUCTED FOR 10 TO 25 HOURS AT A TEMPERATURE OF 30* TO 125*C. IN A DEVICE CAPABLE OF PRODUCING HIGH SHEAR CONDITIONS; AND ISOLATING THE CRYSTALLINE FORM III POLYMORPH THUS FORMED.
References Cited (Backward Citations)
GB828052A
Cited
FR1226260A
Cited
US2982666A
Cited
US3020279A
Cited
US3030370A
Cited
FR1255770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |