Patent US4257812A successfully refreshed from Google Patents.
US4257812A
Expired / Lapsed
US
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Fibrous refractory products
Assignee: Babcock and Wilcox Co
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Filing: 1979-01-17
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Granted: 1981-03-24
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Expires: 1999-01-17
Abstract
Abstract A fibrous refractory product adapted for use in contact with molten aluminum and its alloys consisting essentially of alumino-silicate fiber and kaolin clay in the metakaolin phase. The refractory product is readily machinable before firing.
Inventors
- 👤 Thomas A. Johnson
- 👤 William G. Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:23
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; C04B33/00; C04B33/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A fibrous refractory product for handling molten aluminum, free from asbestos, and being chemically inert to molten aluminum and its alloys prepared by the process of mixing the ingredients consisting essentially of (a) 30 to 80 weight percent of aluminosilicate fiber; and (b) 20 to 70 weight percent of kaolin clay; adding water, shaping the mix, and drying said shaped form at a temperature of less than 200° F. to remove mechanical water and form an unfired part, machining the unfired part, and firing the machined part at an elevated temperature of about 1,500° F. to transform the clay into the amorphous metakaolin phase.
Claim 2
Dependent Claim
104 words
A fibrous refractory product for handling molten aluminum, free from asbestos, and being chemically inert to molten aluminum and its alloys prepared by the process of mixing the ingredients consisting essentially of (a) 30 to 80 weight percent of aluminosilicate fiber; and (b) 20 to 70 weight percent of kaolin clay; adding water, shaping the mix, and drying said shaped form at a temperature of less than 200° F. to remove mechanical water and form an unfired part, machining the unfired part, and firing the machined part at an elevated temperature of about 1,500° F. to transform the clay into the amorphous metakaolin phase.
References Cited (Backward Citations)
US3348957A
Cited
US3510394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |