US3366445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mullite production
Assignee: Harbison Walker Refractories Co
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Filing: 1964-02-26
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Granted: 1968-01-30
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Expires: 1984-02-26
Abstract
No abstract record available.
Inventors
- 👤 Einstein Edward
- 👤 Jr Eldon D Miller
- 👤 Leatham Earl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN A PROCESS FOR PRODUCING RELATIVELY VOLUME STABLE MULLITE AGGREGATE FROM CRUDE BAUXITE CONTAINING AT LEAST OF THE ORDER OF 70 TO 80% AL2/3, BY WEIGHT, ON AN OXIDE IGNITION FREE BASIS, THE STEPS COMPRISING FORMING THE BAUXITE INTO AN AQUEOUS SUSPENSIN BY AGITATING AND DISPERSING THE BAUXITE TO YIELD A UNIFORM MIXTURE CONSISTING OF BAUXITIC MATERIAL AND NONBAUXITIC IMPURITIES, SUBSTANTIALLY ALL OF SAID IMPURITIES HAVING A PARTICLE SIZE GREATER THAN THE BAUXITE MATERIAL, REMOVING THE NONBUAXITIC IMPURITIES FROM THE MIXTURE, BLENDING THE SUSPENSION WITH A FLOCCULATING AGENT TO FORM A RELATIVELY COARSE AGGREGATE, BURNING THE RESULTING AGGREGATE IN A ROTARY KILN AT A TEMPERATURE OF FROM 2900*F. TO JUST BELOW THE INCIPIENT FUSION POINT, THE RESIDENCE TIME OF THE MATERIAL IN THE KILN BEING OF THE ORDER OF AT LEAST 2 HOURS AND RECOVERING SUBSTANTIALLY IRON-FREE MULLITE GRAIN MINERALOGICALLY CHARACTERIZED BY RELATIVELY LARGE AND STABLE, WELL-PACKED, CRYSTALS WITH FEW VOIDS.
Claim 2
Dependent Claim
151 words
IN A PROCESS FOR PRODUCING RELATIVELY VOLUME STABLE MULLITE AGGREGATE FROM CRUDE BAUXITE CONTAINING AT LEAST OF THE ORDER OF 70 TO 80% AL2/3, BY WEIGHT, ON AN OXIDE IGNITION FREE BASIS, THE STEPS COMPRISING FORMING THE BAUXITE INTO AN AQUEOUS SUSPENSIN BY AGITATING AND DISPERSING THE BAUXITE TO YIELD A UNIFORM MIXTURE CONSISTING OF BAUXITIC MATERIAL AND NONBAUXITIC IMPURITIES, SUBSTANTIALLY ALL OF SAID IMPURITIES HAVING A PARTICLE SIZE GREATER THAN THE BAUXITE MATERIAL, REMOVING THE NONBUAXITIC IMPURITIES FROM THE MIXTURE, BLENDING THE SUSPENSION WITH A FLOCCULATING AGENT TO FORM A RELATIVELY COARSE AGGREGATE, BURNING THE RESULTING AGGREGATE IN A ROTARY KILN AT A TEMPERATURE OF FROM 2900*F. TO JUST BELOW THE INCIPIENT FUSION POINT, THE RESIDENCE TIME OF THE MATERIAL IN THE KILN BEING OF THE ORDER OF AT LEAST 2 HOURS AND RECOVERING SUBSTANTIALLY IRON-FREE MULLITE GRAIN MINERALOGICALLY CHARACTERIZED BY RELATIVELY LARGE AND STABLE, WELL-PACKED, CRYSTALS WITH FEW VOIDS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |