Patent US4504591A successfully refreshed from Google Patents.
US4504591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory material
Assignee: Remet Corp
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Filing: 1983-04-21
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Granted: 1985-03-12
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Expires: 2003-04-21
Abstract
Abstract A refractory mix comprising an acid stabilized aqueous zirconia sol and an active refractory material in an amount effective to gel said sol and articles prepared therefrom.
Inventors
- 👤 Roy C. Feagin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:35
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/183; C; C04; C04B; C04B28/00; C04B35/00; C04B35/01; C04B35/48; C04B35/482; C04B35/622; C04B35/624; C04B35/626; C04B35/63; C04B35/6303
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A method of making a refractory casting mold comprising the steps of: (a) making a mixture of an acid-stabilized, aqueous, colloidal zirconia sol and a refractory material, said refractory material comprising an active refractory material capable of gelling said sol after a suitable non-gel working period; (b) applying said mixture to a pattern mold; (c) allowing said mixture to gel on said pattern; and (d) removing the pattern from the gelled mixture.
Claim 2
Independent Claim
72 words
A method of making a refractory casting mold comprising the steps of: (a) making a mixture of an acid-stabilized, aqueous, colloidal zirconia sol and a refractory material, said refractory material comprising an active refractory material capable of gelling said sol after a suitable non-gel working period; (b) applying said mixture to a pattern mold; (c) allowing said mixture to gel on said pattern; and (d) removing the pattern from the gelled mixture.
Claim 3
Dependent Claim
26 words
The method according to claim 1, wherein the gelled mixture of step (d) is dried and is heated to a suitable temperature to receive molten metal.
Claim 4
Dependent Claim
104 words
The method according to claim 1, additionally comprising after the step of applying said mixture to said pattern mold, sprinkling coarse refractory over the coated mold, allowing the resultant coating to gel, applying a second coating of said mixture to said coated pattern mold, sprinkling coarse refractory on said second coating, allowing said second coating to gel, and repeating the coating and sprinkling process to form a refractory shell of sufficient thickness for metal casting over the pattern, removing the pattern mold from the resultant shell, drying and heating said shell to a suitable temperature to form a shell mold for receiving molten metal.
Claim 5
Dependent Claim
34 words
The method of making a metal casting mold according to claim 3, wherein the refractory from the first coating of said mixture is different from the refractory on the second coating of said mixture.
Claim 6
Dependent Claim
37 words
The method of making a refractory casting mold according to claim 1, wherein the active refractory material is selected from the group consisting of alkali and alkaline earth aluminates, silicates, zirconates, stannates, titanates, zirconium silicates and oxides.
Claim 7
Dependent Claim
146 words
The method of making a refractory casting mold according to claim 1, wherein the active refractory material is selected from the group consisting of calcined magnesium oxide, electrically fused magnesium oxide, calcium oxide, electrically fused calcium oxide, mono calcium aluminate, calcium aluminate cement, fused cordierite, high alkali glass, magnesium aluminate, magnesium aluminum silicate, magnesium zirconate, magnesium silicate, magnesium zirconium silicate, magnesium ferrite, magnesium titanate, magnesium stannate, calcium zirconate, calcium silicate, calcium zirconium silicate, calcium titanate, calcium stannate, barium zirconate, barium aluminum silicate, barium aluminate, barium zirconium silicate, barium stannate, barium titanate, barium silicate, strontium zirconate, strontium stannate, strontium zirconium silicate, strontium silicate, strontium aluminum silicate, strontium titanate, electrically fused calcium oxide stabilized zirconia, electrically fused magnesium oxide stabilized zirconia, iron chromite, wollastonite, bentonite, strontium aluminate, forsterite, calcium aluminum silicate, fluorspar, fluorbarite, lithium zirconate, lithium aluminate, lithium silicate, lithium aluminum silicate, lithium titanate or lithium zirconium silicate.
Claim 8
Independent Claim
108 words
The method of making a metal casting comprising forming a metal casting mold produced by a process comprising the steps of: (a) making a mixture of an acid-stabilized, aqueous, colloidal zirconia sol and a refractory material, said refractory material comprising an active refractory material capable of gelling said sol after a suitable non-gel working period; (b) applying said mixture to a pattern mold; (c) allowing said mixture to gel on said pattern; and (d) removing the pattern from the gelled mixture; and wherein the gelled mixture of step (d) is dried and is heated to a suitable temperature to receive molten metal and pouring metal into said mold.
Claim 9
Independent Claim
108 words
The method of making a metal casting comprising forming a metal casting mold produced by a process comprising the steps of: (a) making a mixture of an acid-stabilized, aqueous, colloidal zirconia sol and a refractory material, said refractory material comprising an active refractory material capable of gelling said sol after a suitable non-gel working period; (b) applying said mixture to a pattern mold; (c) allowing said mixture to gel on said pattern; and (d) removing the pattern from the gelled mixture; and wherein the gelled mixture of step (d) is dried and is heated to a suitable temperature to receive molten metal and pouring metal into said mold.
Claim 10
Independent Claim
168 words
The method of making a metal casting comprising forming a metal casting mold produced by a process comprising the steps of: (a) making a mixture of an acid-stabilized, aqueous, colloidal zirconia sol and a refractory material, said refractory material comprising an active refractory material capable of gelling said sol after a suitable non-gel working period and (b) applying said mixture to a pattern mold; and wherein after the step of applying said mixture to said pattern mold, sprinkling coarse refractory over the coated mold, allowing the resultant coating to gel, applying a second coating of said mixture to said coated pattern, mold, sprinkling coarse refractory on said second coating, allowing said second coating to gel, and repeating the coating and sprinkling process to form a refractory shell of sufficient thickness for metal casting over the pattern, removing the pattern mold from the resultant shell, drying and heating said shell to a suitable temperature to form a shell mold for receiving molten metal; and pouring metal into said mold.
Claim 11
Independent Claim
168 words
The method of making a metal casting comprising forming a metal casting mold produced by a process comprising the steps of: (a) making a mixture of an acid-stabilized, aqueous, colloidal zirconia sol and a refractory material, said refractory material comprising an active refractory material capable of gelling said sol after a suitable non-gel working period and (b) applying said mixture to a pattern mold; and wherein after the step of applying said mixture to said pattern mold, sprinkling coarse refractory over the coated mold, allowing the resultant coating to gel, applying a second coating of said mixture to said coated pattern, mold, sprinkling coarse refractory on said second coating, allowing said second coating to gel, and repeating the coating and sprinkling process to form a refractory shell of sufficient thickness for metal casting over the pattern, removing the pattern mold from the resultant shell, drying and heating said shell to a suitable temperature to form a shell mold for receiving molten metal; and pouring metal into said mold.
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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |