US4039344A
Expired / Lapsed
US
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Alumina-chrome refractory composition
Assignee: Krosaki Harima Corp
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Filing: 1976-02-23
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Granted: 1977-08-02
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Expires: 1996-02-23
Abstract
Abstract An alumina-chrome refractory composition comprises 30-60% by weight of alumina-silica type material containing 50-95% by weight of alumina with the major part in coarse particle size, and 70-40% by weight of chrome type material with the major part in fine particle size. In a modification, the alumina-chrome refractory composition comprises 70-99% by weight of a mix consisting of the alumina-silica type material and chrome type material in the above percentages, and 1-30% by weight of at least one of the materials selected from the group consisting of alumina, zircon, zirconia, magnesia, spinel, clay, silicon carbide and titanium oxide in fine particle size ranges.
Inventors
- 👤 Yasuo Nishikawa
- 👤 Takeo Okamura
- 👤 Katsuhei Minami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C04B35/03; C04B35/04; C04B35/043; C04B35/047; C04B35/0476; C04B35/10; C04B35/101; C04B35/105; C04B35/106; C04B35/16; C04B35/18; C04B35/66
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
113 words
An alumina-chrome refractory composition consisting essentially of: 30-60 weight % of an alumina-silica material containing 50-95 weight % of alumina and consisting of particles in which the major portion is coarser than 0.1 mm in size, said alumina-silica material being at least one of the materials selected from the group consisting of synthetic mullite, sillimanite, cyanite, andalusite, diaspore, bauxite and other alumina shales 70-40 weight % of a chrome material containing 15-65 weight % of chromium oxide and wherein the major portion consists of particles finer than 1 mm in size, said chrome material being at least one member selected from the group consisting of chrome ore, chrome-magnesia clinker and chrome-magnesia brick scrap.
Claim 2
Dependent Claim
113 words
An alumina-chrome refractory composition consisting essentially of: 30-60 weight % of an alumina-silica material containing 50-95 weight % of alumina and consisting of particles in which the major portion is coarser than 0.1 mm in size, said alumina-silica material being at least one of the materials selected from the group consisting of synthetic mullite, sillimanite, cyanite, andalusite, diaspore, bauxite and other alumina shales 70-40 weight % of a chrome material containing 15-65 weight % of chromium oxide and wherein the major portion consists of particles finer than 1 mm in size, said chrome material being at least one member selected from the group consisting of chrome ore, chrome-magnesia clinker and chrome-magnesia brick scrap.
Claim 3
Dependent Claim
66 words
An alumina-chrome refractory composition as claimed in claim 1, wherein 70-99 weight % of a mix consisting of said alumina-silica material and chrome material in said ratio and particle size is added with 1-30 weight % of at least one member selected from the group consisting of alumina, zircon, zirconia, magnesia, spinel, clay, silicon carbide and titanium oxide in a particle size finer than 1 mm.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |