US2990289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making siliceous refractories
Assignee: Findlay Refractories Co
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Filing: 1958-09-11
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Granted: 1961-06-27
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Expires: 1978-09-11
Abstract
No abstract record available.
Inventors
- 👤 Lambie James Mcclurg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
THE STEPS IN A METHOD OF FORMING REFRACTORIES, WHICH COMPRISE MAKING A MIXTURE THAT CONTAINS NOT SUBSTANTIALLY LESS THAN 60% SILICA AND THE REMAINDER CONSISTING OF AN ALUMINA-CONTAINING MATERIAL THAT IS OF THE GROUP WHICH CONSISTS OF KAOLIN AND BALL CLAY, FIRING THE MIXTURE TO A POINT AT WHICH THE ALUMINA-CONTAINING MATERIAL HAS REACTED WITH THE SILICA, TO FORM MULLITE AND GLASS, COOLING THE FIRED MIXTURE WITH SUFFICIENT RAPIDITY TO PREVENT THE FORMATION OF CRISTOBALITE TO A SUBSTANTIAL EXTENT, GRINDING THE FIRED MIXTURE TO FORM GROG OF DESIRED SIZES, OF FROM .15" TO FINES, AND THEREAFTER MIXING THE GROG WITH A BONDING CLAY TO FORM A REFRACTORY BODY, PRELIMINARY TO FINAL FIRING, THE GROG CONSTITUING NOT SUBSTANTIALLY LESS THAN 50% OF THE BODY, AND THE BONDING CLAY NOT SUBSTANTIALLY MORE THAN 50% OF THE BODY.
Claim 2
Dependent Claim
135 words
THE STEPS IN A METHOD OF FORMING REFRACTORIES, WHICH COMPRISE MAKING A MIXTURE THAT CONTAINS NOT SUBSTANTIALLY LESS THAN 60% SILICA AND THE REMAINDER CONSISTING OF AN ALUMINA-CONTAINING MATERIAL THAT IS OF THE GROUP WHICH CONSISTS OF KAOLIN AND BALL CLAY, FIRING THE MIXTURE TO A POINT AT WHICH THE ALUMINA-CONTAINING MATERIAL HAS REACTED WITH THE SILICA, TO FORM MULLITE AND GLASS, COOLING THE FIRED MIXTURE WITH SUFFICIENT RAPIDITY TO PREVENT THE FORMATION OF CRISTOBALITE TO A SUBSTANTIAL EXTENT, GRINDING THE FIRED MIXTURE TO FORM GROG OF DESIRED SIZES, OF FROM .15" TO FINES, AND THEREAFTER MIXING THE GROG WITH A BONDING CLAY TO FORM A REFRACTORY BODY, PRELIMINARY TO FINAL FIRING, THE GROG CONSTITUING NOT SUBSTANTIALLY LESS THAN 50% OF THE BODY, AND THE BONDING CLAY NOT SUBSTANTIALLY MORE THAN 50% OF THE BODY.
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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |