US3229970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical furnace lining
Assignee: Harbison Walker Refractories Co
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Filing: 1964-03-02
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Granted: 1966-01-18
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Expires: 1984-03-02
Abstract
No abstract record available.
Inventors
- 👤 George R Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:05
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/16; F27D1/1636; F27D1/1642
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
IN A METALLURGICAL FURNACE, A MONOLITHIC REFRACTORY LINING CAPABLE OF BEING PROVIDED IN SITU BETWEEN FURNACE HEATS AND WHILE SAID FURNACE IS MAINTAINED AT AN ELEVATED TEMPERATURE, BY GUNNING TECHNIQUES, SAID LINING BEING FORMED FROM A BATCH MIXTURE CONSISTING ESSENTIALLY OF: (A) BASIC REFRACTORY GRANULAR PARTICLES CONTAINING ON THE BURNED BASIS, A TOTAL OF AT LEAST 90%, BY WEIGHT, OF MGO, SIO2 AND CAO AND IN WHICH THE WEIGHT RATIO OF CAO TO SIO2 IS IN EXCESS OF THAT REQUIRED TO FORM DICALCIUM SILICATE, (B) NONREFRACTORY MATERIAL CONSISTING OF A TOTAL OF AT LEAST 85%, BY WEIGHT, OF SIO2 AND CAO AND IN WHICH THE WEIGHT RATIO OF CAO TO SIO2 IS ABOUT 1 TO 1, AND (C) FIBROUS ASBESTOS CONSISTING PREDOMINATLY OF MGO AND SIO2, SAID BATCH BEING COMBINED IN SUCH PROPORTIONS THAT THE WEIGHT RATIO OF CAO TO SIO2 IN THE OVERALL MIXTURE IS ABOUT 2 TO 1, THE SITUS OF USE OF SAID LINING BEING MAINTAINED AT A TEMPERATURE HIGHER THAN THAT OF INCIPIENT FUSION OF THE NONREFRACTORY MATERIAL WHEREIN INGREDIENTS IN THE BATCH CAN REACT TO FORM DICALCIUM SILICATE AND BIND THE BASIC REFRACTORY GRANULAR PARTICLES TOGETHER.
Claim 2
Dependent Claim
191 words
IN A METALLURGICAL FURNACE, A MONOLITHIC REFRACTORY LINING CAPABLE OF BEING PROVIDED IN SITU BETWEEN FURNACE HEATS AND WHILE SAID FURNACE IS MAINTAINED AT AN ELEVATED TEMPERATURE, BY GUNNING TECHNIQUES, SAID LINING BEING FORMED FROM A BATCH MIXTURE CONSISTING ESSENTIALLY OF: (A) BASIC REFRACTORY GRANULAR PARTICLES CONTAINING ON THE BURNED BASIS, A TOTAL OF AT LEAST 90%, BY WEIGHT, OF MGO, SIO2 AND CAO AND IN WHICH THE WEIGHT RATIO OF CAO TO SIO2 IS IN EXCESS OF THAT REQUIRED TO FORM DICALCIUM SILICATE, (B) NONREFRACTORY MATERIAL CONSISTING OF A TOTAL OF AT LEAST 85%, BY WEIGHT, OF SIO2 AND CAO AND IN WHICH THE WEIGHT RATIO OF CAO TO SIO2 IS ABOUT 1 TO 1, AND (C) FIBROUS ASBESTOS CONSISTING PREDOMINATLY OF MGO AND SIO2, SAID BATCH BEING COMBINED IN SUCH PROPORTIONS THAT THE WEIGHT RATIO OF CAO TO SIO2 IN THE OVERALL MIXTURE IS ABOUT 2 TO 1, THE SITUS OF USE OF SAID LINING BEING MAINTAINED AT A TEMPERATURE HIGHER THAN THAT OF INCIPIENT FUSION OF THE NONREFRACTORY MATERIAL WHEREIN INGREDIENTS IN THE BATCH CAN REACT TO FORM DICALCIUM SILICATE AND BIND THE BASIC REFRACTORY GRANULAR PARTICLES TOGETHER.
References Cited (Backward Citations)
CA538164A
Cited
US3047411A
Cited
US3141790A
Cited
US2647062A
Cited
US3047711A
Cited
US3092505A
Cited
US3093497A
Cited
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 |