US4235636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic refractories with fused alumina-chrome grog
Assignee: API TECHNOLOGIES Inc A CORP OF
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Filing: 1979-05-04
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Granted: 1980-11-25
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Expires: 1999-05-04
Abstract
Abstract A high alumina, plastic refractory mixture containing 30 to 70 percent crushed fused alumina chrome grog, 10 to 30 percent glass industry grade chromite, 3 to 12 percent alumina, 2 to 6 percent bond clay and 3 to 18 percent of an acid phosphate binder.
Inventors
- 👤 James R. Friedrichs
- 👤 Edward A. Snajdr
- 👤 Bela Klaudinyi, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6306; C04B35/01; C04B35/10; C04B35/101; C04B35/105; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/3231; C04B2235/3241; C04B2235/3243; C04B2235/34; C04B2235/349
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A plastic refractory composition comprising: (a) from 30 to 70 percent of crushed fused alumina-chrome grog; (b) from 10 to 30 percent glass industry grade chromite; (c) from 3 to 12 percent alumina selected from the group consisting of calcined, tabular and fused alumina; (d) from 2 to 6 percent bond clay; (e) from 3 to 18 percent of an acid phosphate binder; and (f) from 0 to 6 percent water.
Claim 2
Dependent Claim
71 words
A plastic refractory composition comprising: (a) from 30 to 70 percent of crushed fused alumina-chrome grog; (b) from 10 to 30 percent glass industry grade chromite; (c) from 3 to 12 percent alumina selected from the group consisting of calcined, tabular and fused alumina; (d) from 2 to 6 percent bond clay; (e) from 3 to 18 percent of an acid phosphate binder; and (f) from 0 to 6 percent water.
Claim 3
Dependent Claim
30 words
A plastic refractory composition as recited in claim 1 wherein said crushed fused alumina-chrome grog comprises from 24 to 97 percent alumina and from 3 to 48 percent chromic oxide.
Claim 4
Dependent Claim
51 words
A plastic refractory composition as recited in claims 1 or 2 comprising: (a) about 51.5 percent fused alumina-chrome grog; (b) about 22.0 percent glass industry grade chromite; (c) about 12 percent alumina; (d) about 4.0 percent bond clay; (e) about 6.5 percent acid phosphate binder; and (f) about 4.0 percent water.
Claim 5
Dependent Claim
59 words
A plastic refractory composition as recited in claims 1 or 2 wherein: (a) said glass industry grade chromite is minus 325 mesh; (b) said alumina is minus 325 mesh; and (c) about 80 percent of said grog has a size distribution from about minus 3 mesh to plus 140 mesh and the remaining grog is about minus 140 mesh.
Claim 6
Dependent Claim
57 words
A plastic refractory composition as recited in claim 3 wherein: (a) said glass industry grade chromite is minus 325 mesh; (b) said alumina is minus 325 mesh; and (c) about 80 percent of said grog has a size distribution from about minus 3 mesh to plus 140 mesh and the remaining grog is about minus 140 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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |