US3565646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making refractory material
Assignee: NATIONAL REFRACTORIES & MINERALS Corp A CORP OF
•
Filing: 1967-11-24
•
Granted: 1971-02-23
•
Expires: 1987-11-24
Abstract
Abstract ALUMINOUS REFRACTORY MATERIAL SUCH AS SPINEL AND MULLITE GRAINS AND CALCIUM ALUMINATE CEMENT CAN BE MADE BY ADDING FOREIGN REFRACTORY OXIDE MATERIALS SUCH AS MAGNESIA, KAOLIN, LIME, ETC. TO AN ALUMINA SOLUTION AND THE PRECIPITATING ALUMINUM HYDROXIDE FROM THE SOLUTION. THE PROCESS OF DISSOLVING ALUMINOUS MATERIAL IN SODIUM HYDROXIDE AND PRECIPITAING ALUMINUM HYDROXIDE WITH SEED MATERIAL IS A SUITABLE METHOD FOR USE IN THE INVENTION. THE INTIMATE ADMIXTURE OF ALUMINA HYDROXIDE AND ADDED REFRACTORY OXIDE IS FIRED TO FORM A REFRACTORY MATERIAL.
Inventors
- 👤 Lloyd M Housh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |