Patent US2849419A successfully refreshed from Google Patents.
US2844484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic pigments
Assignee: EIDP Inc
•
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
- 👤 Albert D Reidinger
- 👤 William S Struve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:10
CPC Classifications
C; C09; C09B; C09B48/00; C09B67/00; C09B67/0025; C09B67/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
AS A NEW RED PIGMENT, LINEAR QUINACRIDONE IN ALPHA CRYSTAL PHASE CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN SHOWING TWO CLOSELY RELATED STRONG LINES WITH INTERPLANAR SPACINGS OF 3.46 A. AND 3.19 A., A THIRD LINE OF SIMILAR INTENSITY WITH AN INTERPLANAR SPACING OF 14.24 A., TWO LINES OF MODERATE INTENSITY WITH INTERPLANAR SPACINGS OF 6.32 A. AND 7.13 A. AND TWO WEEK LINES WITH INTERPLANAR SPACINGS OF 5.30 A. AND 4.27 A., SAID ALPHA CRYSTAL PHASE QUINACRIDONE HAVING A SURFACE AREA OF AT LEAST 60 SQUARE METERS PER GRAM.
Claim 2
Dependent Claim
89 words
AS A NEW RED PIGMENT, LINEAR QUINACRIDONE IN ALPHA CRYSTAL PHASE CHARACTERIZED BY AN X-RAY DIFFRACTION PATTERN SHOWING TWO CLOSELY RELATED STRONG LINES WITH INTERPLANAR SPACINGS OF 3.46 A. AND 3.19 A., A THIRD LINE OF SIMILAR INTENSITY WITH AN INTERPLANAR SPACING OF 14.24 A., TWO LINES OF MODERATE INTENSITY WITH INTERPLANAR SPACINGS OF 6.32 A. AND 7.13 A. AND TWO WEEK LINES WITH INTERPLANAR SPACINGS OF 5.30 A. AND 4.27 A., SAID ALPHA CRYSTAL PHASE QUINACRIDONE HAVING A SURFACE AREA OF AT LEAST 60 SQUARE METERS PER GRAM.
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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 |