US3591392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High alumina brick and method of making
Assignee: General Refractories Co
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Filing: 1968-07-01
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Granted: 1971-07-06
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Expires: 1988-07-01
Abstract
Abstract TO A HIGH ALUMINA BRICK BATCH MIX CONTAINING FROM ABOUT 85 TO ABOUT 95% OF ALUMINA AND FROM ABOUT 5 TO ABOUT 15% OF SILICA, BASED ON THE COMBINED WEIGHT OF SAID ALUMINA AND SILICA, INCLUDING THE USUAL SMALL AMOUNTS OF IMPURITIES ASSOCIATED WITH THE ALUMINA AND SILICA, ARE ADDED A LITHIUM COMPOUND AND AT LEAST ONE OF AN ALKALINE EARTH METAL COMPOUND AND IRON OXIDE, THE TOTAL OF SUCH ADDITIONS BEING MATERIALLY LESS THAN 1%, BY WEIGHT, BASED ON 100 PARTS OF SAID COMBINED ALUMINA AND SILICA, TO IMPROVE THE STRENGTH AND VOLUME STABILITY OF THE RESULTING BRICK WITHOUT ADVERSELY AFFECTING ITS REFRACTORINESS UNDER LOAD.
Inventors
- 👤 Wate T Bakker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10
Claims Analysis
Total Claims: 0
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |