US3552370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Individual
•
Filing: 1969-02-20
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Granted: 1971-01-05
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Expires: 1989-02-20
Abstract
Abstract An internal combustion engine having combustion chamber wall surfaces coated with a heat insulating base layer including nickel and aluminum for retarding heat transfer by conduction and an outer layer including copper for reflecting infrared radiation, and a method for applying said coating to the combustion chamber wall surfaces of the engine.
Inventors
- 👤 Southwick W Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:25
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/02; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0466; F05C2201/0469; F05C2201/0475; F05C2251/00; F05C2251/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
An internal combustion engine including a combustion chamber having a wall surface, the improvement comprising a multilayer coating on at least a portion of said wall surface, said coating including an insulating base layer applied to said wall surface composed of nickel and aluminum for retarding heat transfer through said wall surface by conduction and an outer layer including copper applied to said base layer for reflecting infrared heat radiation.
Claim 2
Dependent Claim
70 words
An internal combustion engine including a combustion chamber having a wall surface, the improvement comprising a multilayer coating on at least a portion of said wall surface, said coating including an insulating base layer applied to said wall surface composed of nickel and aluminum for retarding heat transfer through said wall surface by conduction and an outer layer including copper applied to said base layer for reflecting infrared heat radiation.
Claim 3
Dependent Claim
34 words
The internal combustion engine of claim 1 wherein said inner base layer is applied by flame spraying of powdered aluminum and nickel and wherein said outer layer of copper is applied by flame spraying.
Claim 4
Dependent Claim
33 words
The internal combustion engine of claim 1 wherein said inner base layer has a thickness in a range between 3 to 20 mils and said outer layer is approximately 5 mils in thickness.
Claim 5
Dependent Claim
24 words
The internal combustion engine of claim 1 wherein said base layer comprises approximately 5 to 20 percent aluminum and 95 to 80 percent nickel.
Claim 6
Dependent Claim
20 words
The internal combustion engine of claim 1 wherein said coating has a porosity of 3 to 5 percent by volume.
Claim 7
Dependent Claim
31 words
The internal combustion engine of claim 2 wherein said aluminum and nickel are sprayed onto said wall surface in an acetylene flame and said copper is sprayed in a hydrogen flame.
Claim 8
Dependent Claim
36 words
The internal combustion engine of claim 2 wherein said inner base coating comprises a mixture of 95 percent nickel and 5 percent aluminum applied to a thickness of up to 20 mils on said wall surface.
Claim 9
Dependent Claim
19 words
The internal combustion engine of claim 7 wherein said outer layer comprises cuprous material approximately 5 mils in thickness.
Claim 10
Dependent Claim
25 words
The internal combustion engine of claim 1 wherein said inner and outer layers are applied in nonuniform thicknesses on different areas on said wall surface.
Claim 11
Independent Claim
53 words
A method of coating a combustion chamber wall surface of an internal combustion engine comprising the steps of applying a base coating on said surface up to 20 mils in thickness composed of nickel and aluminum and applying an outer coating on said base coating of cuprous material approximately 5 mils in thickness.
Claim 12
Independent Claim
53 words
A method of coating a combustion chamber wall surface of an internal combustion engine comprising the steps of applying a base coating on said surface up to 20 mils in thickness composed of nickel and aluminum and applying an outer coating on said base coating of cuprous material approximately 5 mils in thickness.
Claim 13
Dependent Claim
25 words
The method of claim 10 wherein said base coating is applied by flame spraying a mixture of powdered nickel and aluminum in an acetylene-rich flame.
Claim 14
Dependent Claim
28 words
The method of claim 11 wherein separate flames are used for simultaneously applying aluminum and nickel in a ratio of approximately 5 percent aluminum and 95 percent nickel.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |