US3567473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for making refractory articles
Assignee: Amsted Industries Inc
•
Filing: 1968-05-14
•
Granted: 1971-03-02
•
Expires: 1988-05-14
Abstract
Abstract THE REFRACTORY COMPOSITION INCLUDES A FUSION PRODUCT AS WELL AS TABULAR ALUMINA, CALCINED ALUMINA, ALPHA QUARTZ, AND A RELATIVELY SMALL QUANTITY OF MANGESIUM OXIDE, ALL OF WHICH INGREDIENTS ARE PROCESSED WIT H A COLLOIDAL SILICA SOLUTION. THE TABULAR ALUMINA AND ALPHA QUARTZ MAY BE REPLACED BY KYANITE. THE FUSION PRODUCT MAY INCLUDE UNSTABILIZED MONOCLINIC ZIRCONIA AND ALUMINA ALONE OR MAY COMPRISE ZIRCONIA, ALUMINA AND EITHER SILICA OR MAGNESIUM OXIDE.
Inventors
- 👤 James Ross Drever
- 👤 Philip David Zimmerman
- 👤 Allan Blaine Brink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; 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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |