US3230100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory
Assignee: Harbison Walker Refractories Co
•
Filing: 1965-02-15
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Granted: 1966-01-18
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Expires: 1985-02-15
Abstract
No abstract record available.
Inventors
- 👤 Davies Ben
- 👤 Jr Eldon D Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/04; C21B7/06; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; F; F27; F27B; F27B7/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
194 words
A FIRED REFRACTORY BODY FORMED FROM A BATCH CONSISTING ESSENTIALLY OF ALUMINA, SILICA, A PORTION OF THE SILICA BEING UNCOMBINED SILICA IN THE FORM OF VOLATILIZED SILICA, AND SILICON CARBIDE IN SUBSTANTIALLY THE PROPORTIONS DEFINED BY (1) THE AREA WITHIN THE LINES INTERSECTION AT THE POINTS 20-21-22-23, AND (2) ALONG THE 90/10 ALUMINA/SILICA LINE BETWEEN 25% TO ABOUT 50%, BY WEIGHT, SILICON CARBIDE AND BETWEEN 5 AND 15% SILICA, ON THE TERNARY DIAGRAM OF FIG. 1, THE MAJOR PART OF THE SILICON CARBIDE BEING ABOUT -4+48 U.S. STANDARD MESH, WITH NO MORE THAN ABOUT 20% OF THE SILICON CARBIDE PASSING A 70 MESH U.S. STANDARD SCREEN, SAID FIRED BODY MICROSCOPICALLY CHARACTERIZED BY FROM 25 TO 70%, BY WEIGHT, OF SILICON CARBIDE, THE PARTICLES OF WHICH ARE RELATIVELY COARSE, IRREGULAR, ANGULAR FORMS WITH THE SEPARATE PARTICLES THEREOF SHOWING GRADATIONS FROM GENERALLY STRAIGHT TO ROUNDED CONFIGURATION, THE GROUNDMASS OF THE FIRED BODY BEING CHARACTERIZED BY A COMPLEX ASSOCIATION OF MULLITE FORMED IN SITU WITH MINOR AMOUNTS OF HEAT-ALTERED SILICA AND ALUMINA DISTRIBUTED THERETHROUGH, THE HEATALTERED SILICA RANGING BETWEEN ABOUT 1 AND 4%, BY WEIGHT, THE ALUMINA IN THE GROUNDMASS BEING CHARACTERIZED AS ROUGH, PERIPHERALLY CORRODED GRAINS.
Claim 2
Dependent Claim
194 words
A FIRED REFRACTORY BODY FORMED FROM A BATCH CONSISTING ESSENTIALLY OF ALUMINA, SILICA, A PORTION OF THE SILICA BEING UNCOMBINED SILICA IN THE FORM OF VOLATILIZED SILICA, AND SILICON CARBIDE IN SUBSTANTIALLY THE PROPORTIONS DEFINED BY (1) THE AREA WITHIN THE LINES INTERSECTION AT THE POINTS 20-21-22-23, AND (2) ALONG THE 90/10 ALUMINA/SILICA LINE BETWEEN 25% TO ABOUT 50%, BY WEIGHT, SILICON CARBIDE AND BETWEEN 5 AND 15% SILICA, ON THE TERNARY DIAGRAM OF FIG. 1, THE MAJOR PART OF THE SILICON CARBIDE BEING ABOUT -4+48 U.S. STANDARD MESH, WITH NO MORE THAN ABOUT 20% OF THE SILICON CARBIDE PASSING A 70 MESH U.S. STANDARD SCREEN, SAID FIRED BODY MICROSCOPICALLY CHARACTERIZED BY FROM 25 TO 70%, BY WEIGHT, OF SILICON CARBIDE, THE PARTICLES OF WHICH ARE RELATIVELY COARSE, IRREGULAR, ANGULAR FORMS WITH THE SEPARATE PARTICLES THEREOF SHOWING GRADATIONS FROM GENERALLY STRAIGHT TO ROUNDED CONFIGURATION, THE GROUNDMASS OF THE FIRED BODY BEING CHARACTERIZED BY A COMPLEX ASSOCIATION OF MULLITE FORMED IN SITU WITH MINOR AMOUNTS OF HEAT-ALTERED SILICA AND ALUMINA DISTRIBUTED THERETHROUGH, THE HEATALTERED SILICA RANGING BETWEEN ABOUT 1 AND 4%, BY WEIGHT, THE ALUMINA IN THE GROUNDMASS BEING CHARACTERIZED AS ROUGH, PERIPHERALLY CORRODED GRAINS.
Claim 3
Dependent Claim
134 words
A BATCH CONSISTING ESSENTIALLY OF ALUMINA, FINELY DIVIDED SILICA,A POTION OF SAID FINELY DEIVIDED SILICA BEING UNCOMBINED SILICA IN THE FORM OF VOLATILIZED SILICA, AND A MIXTURE OF SILICON CARBIDE AND ZIRCON IN A WEIGHT RATIO NOT EXCEEDING TWO PARTS ZIRCON TO ONE PART SILICON CARBIDE, THE MIXTURES OF SILICON CARBIDE AND ZIRCON CONSTITUTING FROM ABOUT 50 TO 70%, BY WEIGHT, OF TEH REFRACTORY THE REMAINDER OF THE BATCH FROM WHICH THE FIRED REFRACTORY IS MADE BEING ALUMINA AND SILICA IN A WEIGHT RATIO RANGING FROM ABOUT 90 ALUMINO/10 SILICA TO 60 ALUMINA/40 SILICA, THE MAJOR PART OF THE SILICON CARBIDE BEING ABOUT -4+48 U.S. STANDARD MESH WITH NO MORE THAN ABOUT 20% OF THE SILICON CARBIDE PASSING A 70 U.S. STANDARD MESH SCREEN, THE ZIRCON BEING SUBSTANTIALLY ALL FINER THAN ABOUT 100 MESH.
Claim 4
Dependent Claim
134 words
A BATCH CONSISTING ESSENTIALLY OF ALUMINA, FINELY DIVIDED SILICA,A POTION OF SAID FINELY DEIVIDED SILICA BEING UNCOMBINED SILICA IN THE FORM OF VOLATILIZED SILICA, AND A MIXTURE OF SILICON CARBIDE AND ZIRCON IN A WEIGHT RATIO NOT EXCEEDING TWO PARTS ZIRCON TO ONE PART SILICON CARBIDE, THE MIXTURES OF SILICON CARBIDE AND ZIRCON CONSTITUTING FROM ABOUT 50 TO 70%, BY WEIGHT, OF TEH REFRACTORY THE REMAINDER OF THE BATCH FROM WHICH THE FIRED REFRACTORY IS MADE BEING ALUMINA AND SILICA IN A WEIGHT RATIO RANGING FROM ABOUT 90 ALUMINO/10 SILICA TO 60 ALUMINA/40 SILICA, THE MAJOR PART OF THE SILICON CARBIDE BEING ABOUT -4+48 U.S. STANDARD MESH WITH NO MORE THAN ABOUT 20% OF THE SILICON CARBIDE PASSING A 70 U.S. STANDARD MESH SCREEN, THE ZIRCON BEING SUBSTANTIALLY ALL FINER THAN ABOUT 100 MESH.
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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |