US3864908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry insulated parts and method of manufacture
Assignee: Individual
•
Filing: 1973-05-24
•
Granted: 1975-02-11
•
Expires: 1993-05-24
Abstract
Abstract An engine component such as a cast iron engine exhaust manifold having an outer irregular-shaped surface is covered with an inorganic heat insulating layer preferably having a thermal conductivity in the range of from about 0.01 BTU/hr/ft/*F to 0.2 BTU/hr/ft/*F. An encapsulating, cast metal layer is formed over the insulating layer so that when hot fluids within the manifold reach temperatures of up to 2,000* F and higher, the temperature at the outer case metal layer does not exceed 450* F.
Inventors
- 👤 Paul G Lahaye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:24
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N13/10; F01N13/102; F01N2310/00; F01N2310/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/31504; Y10T428/31652; Y10T428/31656
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
A CAST METALLIC ENGINE PART SAID PART DEFINING AN OUTER IRREGULARY SHAPED SURFACE AND BEING FORMED OF AN IRON-CONTAINING METAL DEFINING A FLUID CARRING CONDUIT THEREIN UNINTERRUPTED BY FLUID SEALS, AN INORGANIC DRY INSULATION LAYER OVERLYING SAID OUTER SURFACE AND HAVING A THERMAL CONDUCTIVITY IN THE RANGE OF FROM ABOUT 0.01 BTU/HR/FT/*F TO 0.2 BTU/HR/FT/*F, AND A CAST METALLIC, PROTECTIVE ENCAPSULATING LAYER CONFORMING TO THE SHAPE OF AND COVERING SAID INSULATING LAYER, SAID CAST ENCAPSULATING LAYER BEING FORMED OF A METAL HAVING A HIGH THERMAL CONDUCTIVITY AND SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF ALUMINUM, MAGNESIUM AND ALLOYS OF THESE METALS, SAID ENCAPSULATING LAYER HAVING A SURFACE TEMPERATURE BELOW ABOUT 450* F AT FLUID TEMPERATURES WITHIN SAID PART OF FROM 500* F TO AT LEAST 2,000* F, SAID CAST METALLIC ENCAPSULATING LAYER HAVING A THERMAL COEFFICIENT OF EXPANSION MATCHED TO THE THERMAL COEFFICIENT OF EXPANSION OF SAID PART SO THAT OVER-ALL EXPANSION OF SAID PART AND METALLIC ENCAPSULATING LAYER ARE CLOSELY PARALLEL TO EACH OTHER OVER THE OPERATING TEMPERATURE RANGE OF SAID PART.
Claim 2
Dependent Claim
173 words
A CAST METALLIC ENGINE PART SAID PART DEFINING AN OUTER IRREGULARY SHAPED SURFACE AND BEING FORMED OF AN IRON-CONTAINING METAL DEFINING A FLUID CARRING CONDUIT THEREIN UNINTERRUPTED BY FLUID SEALS, AN INORGANIC DRY INSULATION LAYER OVERLYING SAID OUTER SURFACE AND HAVING A THERMAL CONDUCTIVITY IN THE RANGE OF FROM ABOUT 0.01 BTU/HR/FT/*F TO 0.2 BTU/HR/FT/*F, AND A CAST METALLIC, PROTECTIVE ENCAPSULATING LAYER CONFORMING TO THE SHAPE OF AND COVERING SAID INSULATING LAYER, SAID CAST ENCAPSULATING LAYER BEING FORMED OF A METAL HAVING A HIGH THERMAL CONDUCTIVITY AND SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF ALUMINUM, MAGNESIUM AND ALLOYS OF THESE METALS, SAID ENCAPSULATING LAYER HAVING A SURFACE TEMPERATURE BELOW ABOUT 450* F AT FLUID TEMPERATURES WITHIN SAID PART OF FROM 500* F TO AT LEAST 2,000* F, SAID CAST METALLIC ENCAPSULATING LAYER HAVING A THERMAL COEFFICIENT OF EXPANSION MATCHED TO THE THERMAL COEFFICIENT OF EXPANSION OF SAID PART SO THAT OVER-ALL EXPANSION OF SAID PART AND METALLIC ENCAPSULATING LAYER ARE CLOSELY PARALLEL TO EACH OTHER OVER THE OPERATING TEMPERATURE RANGE OF SAID PART.
Claim 3
Dependent Claim
53 words
An engine part in accordance with claim 1 wherein said part is in the form of an engine exhaust manifold interconnected with an engine exhaust gas passage and a supercharger, said manifold having an inlet and an outlet, said cast metallic encapsulating layer being sealed to said conduit at said inlet and outlet.
Claim 4
Dependent Claim
35 words
An engine part in accordance with claim 1 wherein said insulating layer thickness is from about 0.1 to 1.5 inch and said metallic encapsulating layer has a thickness of from about one-sixth to one-half inch.
Claim 5
Dependent Claim
57 words
An engine part in accordance with claim 1 wherein said cast metallic encapsulating layer has a thermal coefficient of expansion of from about 10 X 10 6 to about 12 X 10 6 in/in/*F and said part has a thermal coefficient of expansion of from about 6 X 10 6 to about 8 X 10 6 in/in/*F.
Claim 6
Dependent Claim
19 words
An engine part in accordance with claim 3 wherein said cast metallic layer carries outwardly extending heat dissipating fins.
Claim 7
Dependent Claim
24 words
An engine part in accordance with claim 5 wherein said cast layer comprises material selected from the group consisting essentially of aluminum and magnesium.
Claim 8
Dependent Claim
26 words
An engine part in accordance with claim 3 wherein said one seal is formed by a convoluted metallic collar providing a long thin heat restricting path.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |