Patent US3920412A successfully refreshed from Google Patents.
US3920412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard-surfaced castings and method of producing the same
Assignee: Rotary Power International Inc
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Filing: 1974-10-07
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Granted: 1975-11-18
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Expires: 1994-10-07
Abstract
Abstract A method of producing a casting of a basis metal having a transplanted facing of a very hard material. Hard facing materials such as refractory metals and cemented carbides are sprayed by a metalizing gun in a layer onto a core piece, an intermediate layer of metal is then sprayed onto the first layer to protect the brittle hard facing material from the thermal shock of casting temperatures, the core piece positioned in a mold as at least a portion of the cavity wall thereof, and a casting formed against and interlocking with the intermediate layer. The casting and core piece are removed from the mold and the core piece detached from the casting, leaving the first layer as an integral part of the casting having a hard surface.
Inventors
- 👤 Charles Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:02
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/0009; F; F02; F02B; F02B53/00; F02B2053/005; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12736; Y10T428/1275; Y10T428/12764; Y10T428/12771; Y10T428/12778
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A PRESSURE-CAST ARTICLE HAVING AT LEAST A PORTION OF ITS SURFACE COATED WITH A SELECTED THICKNESS OF A HARD FACING MATERIAL, WHEREIN THE IMPROVEMENT COMPRISES: A. THE HARD FACING MATERIAL BEING A METALLOID MATERIAL SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN, COBALT, MOLYBDENUM, TUNGSTEN CARBIDE, COBALT CARBIDE, MOLYBDENUM CARBIDE, SILICON CARBIDE AND TITANIUM CARBIDE; B. A METALLIC LAYER UNDERLYING THE HARD FACING, THE UNDERLYING LAYER BEING FROM THREE TO TWENTY TIMES THE THICKNESS OF THE HARD FACING AND BEING SELECTED FROM THE GROUP CONSISTING OF THE ALUMINUM FAMILY AND THE COPPER FAMILY, THE UNDERLYING LAYER BEING FIRMLY UNITED TO THE HARD FACING MATERIAL; C. THE BODY OF THE CASTING BEING A METAL SELECTED FROM THE GROUP CONSISTING OF ALLOYS OF ALUMINUM, MAGNESIUM, AND ZINC, THE METAL OF THE BODY OF THE CASTING BEING FIRMLY UNITED TO THE UNDERLYING LAYER; AND D. THE HARD FACING, THE UNDERLYING LAYER, AND THE BODY OF THE CASTING ALL BEING INTEGRAL PORTIONS OF THE CAST ARTICLE.
Claim 2
Dependent Claim
161 words
A PRESSURE-CAST ARTICLE HAVING AT LEAST A PORTION OF ITS SURFACE COATED WITH A SELECTED THICKNESS OF A HARD FACING MATERIAL, WHEREIN THE IMPROVEMENT COMPRISES: A. THE HARD FACING MATERIAL BEING A METALLOID MATERIAL SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN, COBALT, MOLYBDENUM, TUNGSTEN CARBIDE, COBALT CARBIDE, MOLYBDENUM CARBIDE, SILICON CARBIDE AND TITANIUM CARBIDE; B. A METALLIC LAYER UNDERLYING THE HARD FACING, THE UNDERLYING LAYER BEING FROM THREE TO TWENTY TIMES THE THICKNESS OF THE HARD FACING AND BEING SELECTED FROM THE GROUP CONSISTING OF THE ALUMINUM FAMILY AND THE COPPER FAMILY, THE UNDERLYING LAYER BEING FIRMLY UNITED TO THE HARD FACING MATERIAL; C. THE BODY OF THE CASTING BEING A METAL SELECTED FROM THE GROUP CONSISTING OF ALLOYS OF ALUMINUM, MAGNESIUM, AND ZINC, THE METAL OF THE BODY OF THE CASTING BEING FIRMLY UNITED TO THE UNDERLYING LAYER; AND D. THE HARD FACING, THE UNDERLYING LAYER, AND THE BODY OF THE CASTING ALL BEING INTEGRAL PORTIONS OF THE CAST ARTICLE.
Claim 3
Dependent Claim
20 words
The combination recited in claim 1, wherein the metal of the underlying layer is a member of the aluminum family.
Claim 4
Dependent Claim
13 words
The combination recited in claim 2, wherein the metalloid material is tungsten carbide.
Claim 5
Dependent Claim
13 words
The combination recited in claim 2, wherein the metalloid material is molybdenum carbide.
Claim 6
Dependent Claim
13 words
The combination recited in claim 2, wherein the metalloid material is silicon carbide.
Claim 7
Dependent Claim
13 words
The combination recited in claim 2, wherein the metalloid material is titanium carbide.
Claim 8
Dependent Claim
20 words
The combination recited in claim 1, wherein the metal of the underlying layer is a member of the copper family.
Claim 9
Dependent Claim
13 words
The combination recited in claim 7, wherein the metalloid material is tungsten carbide.
Claim 10
Dependent Claim
13 words
The combination recited in claim 7, wherein the metalloid material is molybdenum carbide.
Claim 11
Dependent Claim
13 words
The combination recited in claim 7, wherein the metalloid material is titanium carbide.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |