US3852080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making magnesite brick
Assignee: DRESS IND Inc
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Filing: 1973-05-16
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Granted: 1974-12-03
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Expires: 1993-05-16
Abstract
Abstract Method of making magnesite brick comprising preparing a batch of synthetic magnesite having an MgO content of from 90 to 96 per cent, a lime: silica ratio in excess of 2:1, and at least 0.1 per cent finely divided silica to provide the batch with a lime: silica ratio between 2:1 and 1.4:1, and burning in excess of 2,800*F.
Inventors
- 👤 E Weaver
- 👤 B Davies
- 👤 G Carini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/043
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
THE METHOD OF MAKING BURNED MAGNESITE BRICK COMPRISING THE STEPS PF: A. FORMING SIZE-GRADED BATCHT CONSISTING ESSENTIALLY OF SYNTHETIC DEAD-BURNED MAGNESITE HAVING A LIMESILICA WEIGHT RATIO IN EXCESS OF 2:1 AND AT LEAST 0.1 OER CENT, BY WEIGHT, OF THE TOTAL BATCH FINELY DIVIDED SILICA, THE MGO CONTENT OF THE OVERALL BATCH BEING FROM 90 TO ABOUT 96 PER CENT, THE LIMESILICA WEIGHT RATIO OF THE OVERALL BATH BEING BETWEEN 2:1 AND 1.4:1 THE BATH ANALYZING LESS THAN 3.0 PER CENT R2O3 OXIDES, LESS THAN 0.5 PER CENT TIO2, LESS THAN 0.5 PER CENT AL2O3 AND LESS THAN 0.05 PER CENT B2O3; B. TEMPERING THE BATCH WITH A TEMPORARY BINDER; C. PRESSING THE TEMPERED BATCH INTO BRICK; D. DRYING THE BRICK; AND E. FIRING AT TEMPERATURES IN EXCESS OF 2,8000*F.
Claim 2
Independent Claim
130 words
THE METHOD OF MAKING BURNED MAGNESITE BRICK COMPRISING THE STEPS PF: A. FORMING SIZE-GRADED BATCHT CONSISTING ESSENTIALLY OF SYNTHETIC DEAD-BURNED MAGNESITE HAVING A LIMESILICA WEIGHT RATIO IN EXCESS OF 2:1 AND AT LEAST 0.1 OER CENT, BY WEIGHT, OF THE TOTAL BATCH FINELY DIVIDED SILICA, THE MGO CONTENT OF THE OVERALL BATCH BEING FROM 90 TO ABOUT 96 PER CENT, THE LIMESILICA WEIGHT RATIO OF THE OVERALL BATH BEING BETWEEN 2:1 AND 1.4:1 THE BATH ANALYZING LESS THAN 3.0 PER CENT R2O3 OXIDES, LESS THAN 0.5 PER CENT TIO2, LESS THAN 0.5 PER CENT AL2O3 AND LESS THAN 0.05 PER CENT B2O3; B. TEMPERING THE BATCH WITH A TEMPORARY BINDER; C. PRESSING THE TEMPERED BATCH INTO BRICK; D. DRYING THE BRICK; AND E. FIRING AT TEMPERATURES IN EXCESS OF 2,8000*F.
Claim 3
Dependent Claim
93 words
Burned magnesite brick formed from a batch consisting essentially of synthetic dead-burned magnesite having a lime: silica weight ratio in excess of 2:1 and at least 0.1 per cent, by weight, of finely divided silica, the MgO content of the overall batch being between 90 and about 96 per cent, the lime: silica weight ratio of the overall batch being between 2:1 and 1.4:1, the batch analyzing less than 3.0 per cent R2O3 oxides, less than 0.5 per cent TiO2, less than 0.5 per cent Al2O3, and less than 0.05 per cent B2O3.
Claim 4
Dependent Claim
93 words
Burned magnesite brick formed from a batch consisting essentially of synthetic dead-burned magnesite having a lime: silica weight ratio in excess of 2:1 and at least 0.1 per cent, by weight, of finely divided silica, the MgO content of the overall batch being between 90 and about 96 per cent, the lime: silica weight ratio of the overall batch being between 2:1 and 1.4:1, the batch analyzing less than 3.0 per cent R2O3 oxides, less than 0.5 per cent TiO2, less than 0.5 per cent Al2O3, and less than 0.05 per cent B2O3.
Claim 5
Dependent Claim
13 words
The brick according to claim 2 in which the fired brick are tar-impregnated.
Claim 6
Dependent Claim
23 words
The brick of claim 2 in which the fired brick have a matrix phase comprising a solid solution of dicalcium silicate and merwinite.
Claim 7
Dependent Claim
18 words
The brick of claim 2 in which the batch has a CaO: SiO2 ratio between 1.8:1 and 1.6:1.
Claim 8
Dependent Claim
17 words
The brick of claim 2 in which the MgO content is from 90 to 95.61 per cent.
Claim 9
Dependent Claim
18 words
The brick of claim 2 in which the MgO content is from about 95 to 96 per cent.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |