Patent US2844485A successfully refreshed from Google Patents.
US2844485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic pigments
Assignee: EIDP Inc
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Filing: 1955-07-22
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Granted: 1958-07-22
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Expires: 1975-07-22
Abstract
No abstract record available.
Inventors
- 👤 William S Struve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:18
CPC Classifications
C; C09; C09B; C09B48/00; C09B67/00; C09B67/0025; C09B67/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A NEW BLUISH RED TO VIOLET PIGMENT COMPRISING LINEAR QUINACRIDONE IN THE BETA CRYSTAL PHASE CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN EXHIBITING TWO STRONG LINES CORRESPONDING TO INTERPLANAR SPACING OF 3.31 A. AND 15.23 A. AND EXHIBITING THREE OTHER LINES OF LESSER INTENSITY CORRESPONDING TO INTERPLANAR SPACINGS OF 7.55 A., 5.47 A. AND 4.06 A., SAID BETA CRYSTAL PHASE QUINACRIDONE HAVING A SURFACE AREA OF AT LEAST 60 SQUARE METERS PER GRAM.
Claim 2
Dependent Claim
72 words
A NEW BLUISH RED TO VIOLET PIGMENT COMPRISING LINEAR QUINACRIDONE IN THE BETA CRYSTAL PHASE CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN EXHIBITING TWO STRONG LINES CORRESPONDING TO INTERPLANAR SPACING OF 3.31 A. AND 15.23 A. AND EXHIBITING THREE OTHER LINES OF LESSER INTENSITY CORRESPONDING TO INTERPLANAR SPACINGS OF 7.55 A., 5.47 A. AND 4.06 A., SAID BETA CRYSTAL PHASE QUINACRIDONE HAVING A SURFACE AREA OF AT LEAST 60 SQUARE METERS PER GRAM.
References Cited (Backward Citations)
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US2378283A
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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 |