US2844581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic pigments
Assignee: EIDP Inc
•
Filing: 1957-11-22
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Granted: 1958-07-22
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Expires: 1977-11-22
Abstract
No abstract record available.
Inventors
- 👤 Charles W Manger
- 👤 William S Struve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
C; C09; C09B; C09B48/00; C09B67/00; C09B67/0025; C09B67/0027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
AS A NEW RED PIGMENT, LINEAR QUINACRIDONE IN GAMMA CRYSTAL PHASE, CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN EXHIBITING THREE STRONG LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 13.58 A., 6.41 A. AND 3.37 A., AND FOUR RELATIVELY WEAK LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 6.70 A., 5.24 A., 4.33 A. AND 3.74A
Claim 2
Dependent Claim
51 words
AS A NEW RED PIGMENT, LINEAR QUINACRIDONE IN GAMMA CRYSTAL PHASE, CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN EXHIBITING THREE STRONG LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 13.58 A., 6.41 A. AND 3.37 A., AND FOUR RELATIVELY WEAK LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 6.70 A., 5.24 A., 4.33 A. AND 3.74A
Claim 3
Dependent Claim
105 words
A PROCESS FOR PREPARING A GAMMA CRYSTAL PHASE LINEAR QUINACRIDONE PIGMENT CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN EXHIBITING THREE STRONG LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 13.58 A., 6.41 A. AND 3.37 A., AND THREE RELATIVELY WEAK LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 5.24 A., 4.33 A. AND 3.74 A., WHICH COMPRISES SALT MILLING LINEAR QUINACRIDONE AND CONTACTING THE MILLED MIXTURE WITH DIMETHYL FORMAMIDE TO INSURE THE GAMMA CRYSTAL PHASE, SAID SALT MILLING BEING CONTINUED UNTIL THE SURFACE AREA OF THE PIGMENT IS AT LEAST 60 SQUARE METERS PER GRAM, SEPARATING THE SALT AND THE DIMETHYL FORMAMIDE AND RECOVERING A GAMMA CRYSTAL PHASE QUINACRIDONE PIGMENT.
Claim 4
Dependent Claim
105 words
A PROCESS FOR PREPARING A GAMMA CRYSTAL PHASE LINEAR QUINACRIDONE PIGMENT CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN EXHIBITING THREE STRONG LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 13.58 A., 6.41 A. AND 3.37 A., AND THREE RELATIVELY WEAK LINES CORRESPONDING TO INTERPLANAR SPACINGS OF 5.24 A., 4.33 A. AND 3.74 A., WHICH COMPRISES SALT MILLING LINEAR QUINACRIDONE AND CONTACTING THE MILLED MIXTURE WITH DIMETHYL FORMAMIDE TO INSURE THE GAMMA CRYSTAL PHASE, SAID SALT MILLING BEING CONTINUED UNTIL THE SURFACE AREA OF THE PIGMENT IS AT LEAST 60 SQUARE METERS PER GRAM, SEPARATING THE SALT AND THE DIMETHYL FORMAMIDE AND RECOVERING A GAMMA CRYSTAL PHASE QUINACRIDONE PIGMENT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |