US3220862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of alumina refractortes
Assignee: —
•
Filing: —
•
Granted: 1965-11-30
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Expires: 1982-11-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/10; C04B35/101; C04B35/622; C04B35/626; C04B35/62605; C04B35/62625; C04B35/6263; C04B35/63; C04B35/6303; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/3222; C04B2235/34; C04B2235/3418; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/70; C04B2235/72; C04B2235/74; C04B2235/77
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A DRY, UNCONSOLIDATED HIGH ALUMINA REFRACTORY MIXTURE FOR MIXING WITH TEMPERING FLUID TO MAKE A SIZE GRADED HIGH ALUMINA REFRACTORY BATCH, SAID MIXTURE CONSISTING ESSENTIALLY OF, BY WEIGHT, FROM AT LEAST 1 TO NOT OVER 10% OF SUBSTANTIALLY PURE VOLATILIZED SILICA, FROM ABOUT 0.2 TO ABOUT 10% OF HYDRATED ALUMINA APPROXIMATELY 1/3 OF THE WEIGHT OF WHICH IS CONTRIBUTED BY WATER OF CRYSTALLIZATION AND HAVING NO MORE THAN ABOUT 1% OF IMPURITIES, THE REMAINDER BEING AL2O3, ON AN OXIDE ANALYSIS, AND SUBSTANTIALLY ALL OF WHICH PASSES A 325 MESH SCREEN, THE REMAINDER OF THE BLATCH BEING COARSE GROUND ALUMINA REFRACTORY MATERIAL HAVING LESS THAN ABOUT 1.3%, BY WEIGHT, OF IRON OXIDE AND SELECTED FROM THE GROUP CONSISTING OF ALUMINA, ALUMINUM ORES AND MIXTURES THEREOF CONTAINING AT LEAST ABOUT 50% OF AL2O3, BY ANALYSIS, AND SUFFICIENT CRYSTALLINE SILICA TO CONTROL THE AL2O3 ANALYSIS OF THE TOTAL MIX BETWEEN ABOUT 50 AND 98.5%.
Claim 2
Dependent Claim
151 words
A DRY, UNCONSOLIDATED HIGH ALUMINA REFRACTORY MIXTURE FOR MIXING WITH TEMPERING FLUID TO MAKE A SIZE GRADED HIGH ALUMINA REFRACTORY BATCH, SAID MIXTURE CONSISTING ESSENTIALLY OF, BY WEIGHT, FROM AT LEAST 1 TO NOT OVER 10% OF SUBSTANTIALLY PURE VOLATILIZED SILICA, FROM ABOUT 0.2 TO ABOUT 10% OF HYDRATED ALUMINA APPROXIMATELY 1/3 OF THE WEIGHT OF WHICH IS CONTRIBUTED BY WATER OF CRYSTALLIZATION AND HAVING NO MORE THAN ABOUT 1% OF IMPURITIES, THE REMAINDER BEING AL2O3, ON AN OXIDE ANALYSIS, AND SUBSTANTIALLY ALL OF WHICH PASSES A 325 MESH SCREEN, THE REMAINDER OF THE BLATCH BEING COARSE GROUND ALUMINA REFRACTORY MATERIAL HAVING LESS THAN ABOUT 1.3%, BY WEIGHT, OF IRON OXIDE AND SELECTED FROM THE GROUP CONSISTING OF ALUMINA, ALUMINUM ORES AND MIXTURES THEREOF CONTAINING AT LEAST ABOUT 50% OF AL2O3, BY ANALYSIS, AND SUFFICIENT CRYSTALLINE SILICA TO CONTROL THE AL2O3 ANALYSIS OF THE TOTAL MIX BETWEEN ABOUT 50 AND 98.5%.
References Cited (Backward Citations)
US3067050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |