US2943970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper pigments
Assignee: COLNMBIA SOUTHERN CHEMICAL COR
•
Filing: 1959-04-14
•
Granted: 1960-07-05
•
Expires: 1979-04-14
Abstract
No abstract record available.
Inventors
- 👤 Edward M Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:35
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/68; B; B82; B82Y; B82Y30/00; C; C09; C09C; C09C1/00; C09C1/28; C01; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
PAPER HAVING DISPERSED THEREIN FINELY DIVIDED, PRECIPITATED, FLOCCULATED SILICEOUS PIGMENT, THE PIGMENT BEING IN THE FORM OF FLOCS OF ULTIMATE PARTICLES, SAID FLOCS UNDER HIGH MAGNIFICATION VISUALLY RESEMBLING GRAPE CLUSTERS, THE INDIVIDUAL GRAPES OF WHICH ARE REPRESENTATIVES OF ULTIMATE PARTICLES OF SILICEOUS MATERIAL, THE AVERAGE SIZE OF THE ULTIMATE PARTICLES BEING LESS THAN 0.25 MICRON, AT LEAST 55 PERCENT BY WEIGHT OF THE PIGMENT FLOCS BEING BELOW 7 MICRONS.
References Cited (Backward Citations)
US2805955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |