US4854367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory compositions and evaporative pattern casting process using same
Assignee: Ashland LLC
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Filing: 1988-10-28
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Granted: 1989-08-08
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Expires: 2008-10-28
Abstract
Abstract An improved expendable pattern casting process and an improved refractory composition for coating expendable patterns used in the process comprising substantially spherical refractory material and an inorganic binder selected from the group consisting of aluminum phosphate, sodium silicate and potassium silicate.
Inventors
- 👤 Robert L. Snook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:49
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/34; B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C7/00; B22C7/02; B22C7/023; C04B28/24; C04B28/26; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6306; C04B35/6309; C04B35/6316; C04B38/00; C04B38/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
An improvement in the process for the preparation of metallic castings by the evaporative pattern casting process wherein an expendable pattern is coated with refractory material prior to the pouring of molten metal to form a casting of the desired shape which comprises coating the expendable pattern with a refractory composition comprising a sufficient amount of substantially spherical refractory material and an inorganic binder selected from the group consisting of aluminium phosphate, sodium silicate and potassium silicate to support the pattern during the pouring of the metal and to vent the gases formed by the evaporation of the pattern so as to obtain a casting of the desired shape and surface.
Claim 2
Dependent Claim
111 words
An improvement in the process for the preparation of metallic castings by the evaporative pattern casting process wherein an expendable pattern is coated with refractory material prior to the pouring of molten metal to form a casting of the desired shape which comprises coating the expendable pattern with a refractory composition comprising a sufficient amount of substantially spherical refractory material and an inorganic binder selected from the group consisting of aluminium phosphate, sodium silicate and potassium silicate to support the pattern during the pouring of the metal and to vent the gases formed by the evaporation of the pattern so as to obtain a casting of the desired shape and surface.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the inorganic binder is aluminum phosphate.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the inorganic binder is sodium silicate.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the inorganic binder is potassium silicate.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the expendable pattern is made of expandable polystyrene.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the refractory material comprises, at least, about 10 percent by volume substantially spherical refractory material.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the substantially spherical refractory material is hollow.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein the refractory material is aluminum silicate.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein more than one coating of the refractory material is applied to the surface of the pattern prior to the pouring of the molten metal.
Claim 11
Dependent Claim
92 words
A process of the preparation of a casting by the evaporative pattern casting procedure which comprises forming a pattern of the desired article from vaporizable material, coating the pattern with a refractory composition comprising an inorganic binder selected from the group consisting of aluminium phosphate, sodium silicate and potassium silicate and refractory material at least, 10 percent by volume of a substantially spherical shape, placing the coated pattern in unbonded sand and pouring molten metal into the coated pattern causing the vaporization of the pattern and the formation of the desired casting.
Claim 12
Dependent Claim
92 words
A process of the preparation of a casting by the evaporative pattern casting procedure which comprises forming a pattern of the desired article from vaporizable material, coating the pattern with a refractory composition comprising an inorganic binder selected from the group consisting of aluminium phosphate, sodium silicate and potassium silicate and refractory material at least, 10 percent by volume of a substantially spherical shape, placing the coated pattern in unbonded sand and pouring molten metal into the coated pattern causing the vaporization of the pattern and the formation of the desired casting.
Claim 13
Dependent Claim
14 words
The process of claim 10 wherein the expendable pattern is made of expandable polystyrene.
Claim 14
Dependent Claim
16 words
The process of claim 10 wherein the refractory material substantially consists of substantially spherically shaped material.
Claim 15
Dependent Claim
21 words
The process of claim 10 wherein the refractory material comprises, at least, about ten percent by volume substantially spherical refractory material.
Claim 16
Dependent Claim
13 words
The process of claim 10 wherein the substantially spherical refractory material is hollow.
Claim 17
Dependent Claim
14 words
The process of claim 10 wherein the refractory material is composed of aluminum silicate.
Claim 18
Dependent Claim
30 words
The process of claim 10 wherein more than one coating of the refractory material is applied to the surface of the pattern prior to the pouring of the molten metal.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |