US4450886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing suction manifolds for automobile engines
Assignee: Nakamura Kinzoku Kogyosho Inc
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Filing: 1982-12-13
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Granted: 1984-05-29
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Expires: 2002-12-13
Abstract
Abstract A method of producing suction manifolds for automobile engines. In forming an exhaust gas re-circulating pipe passage integrally with a suction manifold for re-circulating exhaust gases from the engine to the suction manifold, a curved pipe of aluminum having a high-temperature resistant film formed on its surface is molded into a manifold of aluminum alloy at a suitable place on the latter.
Inventors
- 👤 Michitoshi Enomoto
- 👤 Yasuo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:34
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/0072; F; F02; F02M; F02M26/00; F02M26/11; F02M26/13; F02M2026/001; F02M2026/009
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
182 words
A method for producing suction manifolds for automobile engines comprising the steps of: (a) applying to an outer surface of a curved aluminum pipe, a two layer film, by first applying directly on said surface of the pipe, as a first layer, a high-temperature resistant chemical film comprising materials selected from the group consisting of a phosphate, a halide, a chromate, an inorganic base, a metal oxide fine powder or an easily oxidizable metal fine powder, in the presence of a reaction accelerator selected from the group consisting of hydrofluoric acid or phosphoric acid, and then applying on the surface of the first layer, as a second layer, a lubricating film comprising materials selected from the group consisting of fatty acids and salts thereof, oils, fats, condensation polymerization compounds, graphite, carbon black, molybdenum bisulfide or boron nitride; and (b) placing said coated pipe onto a mold having a cavity shaped to define a manifold and then pouring molten aluminum into the mold to form a manifold wherein, after casting is completed, said curved aluminum pipe functions as an exhaust gas recirculating passage.
Claim 2
Independent Claim
182 words
A method for producing suction manifolds for automobile engines comprising the steps of: (a) applying to an outer surface of a curved aluminum pipe, a two layer film, by first applying directly on said surface of the pipe, as a first layer, a high-temperature resistant chemical film comprising materials selected from the group consisting of a phosphate, a halide, a chromate, an inorganic base, a metal oxide fine powder or an easily oxidizable metal fine powder, in the presence of a reaction accelerator selected from the group consisting of hydrofluoric acid or phosphoric acid, and then applying on the surface of the first layer, as a second layer, a lubricating film comprising materials selected from the group consisting of fatty acids and salts thereof, oils, fats, condensation polymerization compounds, graphite, carbon black, molybdenum bisulfide or boron nitride; and (b) placing said coated pipe onto a mold having a cavity shaped to define a manifold and then pouring molten aluminum into the mold to form a manifold wherein, after casting is completed, said curved aluminum pipe functions as an exhaust gas recirculating passage.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein the first film is formed on the surface of said pipe by applying to said surface a material selected from zinc fluoride, sodium silicofluoride, alumina or zirconia.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein the second film is formed on said first film by applying to the surface of the first film a material selected from graphite or molybdenum bisulfide.
Claim 5
Dependent Claim
42 words
The method of claim 1 wherein the first film is formed on the surface of said pipe by applying to said surface a suspension of metal oxide fine powder in the presence of hydrofluoric acid, then drying the suspension on said pipe.
Claim 6
Dependent Claim
55 words
The method of claim 1 wherein said lubricant film is formed on the surface of said first film on said pipe by applying, as the lubricant material, graphite in a volatile organic solvent or water onto the surface of the first film on the pipe and then drying to remove the organic solvent or water.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the total thickness of said first and second films is about 5 to 100 microns.
References Cited (Backward Citations)
US1025817A
Cited
US3423279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |