Patent US2830348A successfully refreshed from Google Patents.
US2830348A
Expired / Lapsed
US
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Refractory materials
Assignee: The General Electric Company PLC
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Filing: 1952-03-04
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Granted: 1958-04-15
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Expires: 1972-03-04
Abstract
No abstract record available.
Inventors
- 👤 Busby Terence Stanley
- 👤 Manners Maurice
- 👤 Partridge John Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:34
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
138 words
A METHOD OF MANUFACTURING A COHERENT BODY OF REFRACTORY MATERIAL CONSISTING ESSENTIALLY OF CRYSTALS OF MULLITE, CRYSTALS OF ZIRCON AND CRYSTALS OF ZIRCONIA, AND A VITREOUS BONDING MEDIUM CONSISTING ESSENTIALLY OF SILICA BONDING TOGETHER THE CRYSTALS OF ZIRCON AND ZIRCONIA, THE MULLITE CRYSTALS BEING IN THE VITREOUS BONDING MEDIUM AND CONIA, WHICH METHOD COMPRISES THE STEPS OF PREPARING A MIXTURE CONSISTING ESSENTIALLY OF 40% TO 80% FINELY GROUND ZIRCON, 20% TO 60% SUBSTANTIALLY PURE CHINA CLAY, AND 0 TO 40% UNCOMBINED ALUMINA BY WEIGHT, MOULDING THE SAID MIXTURE TO A DESIRED SHAPE, AND HEATING THE SAID MIXTURE FOR A PERIOD OF AT LEAST 3 HOURS AT A TEMPERATURE WITHIN THE RANGE OF 1500*C. TO 1650*C. SUCH THAT SOME FREE ZIRCONIA IS PRESENT IN THE PRODUCT AND ALL THE ALUMINA IS COMBINED WITH SILICA IN THE FORM OF MULLITE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |