US3592674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a calcium carbonate-magnesium hydroxide pigment and the pigment produced
Assignee: Dow Chemical Co
•
Filing: 1968-11-04
•
Granted: 1971-07-13
•
Expires: 1988-11-04
Abstract
Abstract THIS SPECIFICATION DISCLOSES A METHOD OF PREPARING A PIGMENT FOR USE, FOR EXAMPLE, ON PAPER SURFACES COMPRISING: CALCINING A DOLOMITIC LIMESTONE TO THE OXIDES OF MAGNESIUM AND CALCIUM, SLAKING AT LEAST A CALIUM OXIDE COMPONENT IN WATER TO THE CORRESPONDING HYDROXIDE, CARBONATING ONLY THE CALCIUM PORTION THEREOF TO THE CARBONATE, SLAKING ANY REMAINING MAGNESIUM OXIDE IN WATER TO THE CORRESPONDING HYDROXIDE, DEWATERING THE RESULTING SLURRY, AND IF DESIRED, WASHING AND HOMOGENIZING THE CALIUM CARBONATE AND MAGNESIUM HYDROXIDE MIXTURE, TO PRODUCE A MICRON SIZED PIGMENT PRODUCT USEFUL IN A NUMBER OF APPLICATIONS.
Inventors
- 👤 John Maskal
- 👤 Ivan M Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:33
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/385; C; C09; C09C; C09C1/00; C09C1/02; C09C1/028; D21H17/00; D21H17/63; D21H17/67; D21H17/675; D21H21/00; D21H21/50; D21H21/52; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/70; C01P2002/77; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |