Patent CA635238A successfully refreshed from Google Patents.
Patent US3908372A successfully refreshed from Google Patents.
US3908372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shield for exhaust conduits
Assignee: Tenneco Inc
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Filing: 1974-08-15
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Granted: 1975-09-30
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Expires: 1994-08-15
Abstract
Abstract A flexible heat shield for the outside of a conduit of an internal combustion engine exhaust system comprises numerous metal coils, preferably parts of a helical strip, which longitudinally overlap on one edge and have standoff flanges engaging the conduit on the other edge, the coils being perforated in accordance with a program that locates the holes on the bottom side of the conduit.
Inventors
- 👤 Charles P Fowler
- 👤 Robert N Balluff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:47
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/14; F01N2470/00; F01N2470/12; F01N2470/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
In an internal combustion engine exhaust system including a gas treating device and a horizontally extending exhaust gas flow conduit having an outer surface and connected in series to the device, a heat shield mounted on the conduit and comprising a series of longitudinally overlapping annular coils that are longitudinally adjustable relative to each other whereby they may be fitted over bends in the conduit while substantially maintaining longitudinal contact with adjacent coils, each of said coils having a transverse flange along one edge that contacts the outer surface of the conduit to space the coil from said outer surface, the other edge of the coil slidably fitting on the outside of the flanged edge of the adjacent coil, the space between the coil and the outer surface of the conduit comprising an air gap, at least the top half of said coils being imperforate, the bottom half of said coils containing apertures to provide for the flow of air through the coil, said coils comprising interconnected turns of a helically coiled metal strip.
Claim 2
Dependent Claim
174 words
In an internal combustion engine exhaust system including a gas treating device and a horizontally extending exhaust gas flow conduit having an outer surface and connected in series to the device, a heat shield mounted on the conduit and comprising a series of longitudinally overlapping annular coils that are longitudinally adjustable relative to each other whereby they may be fitted over bends in the conduit while substantially maintaining longitudinal contact with adjacent coils, each of said coils having a transverse flange along one edge that contacts the outer surface of the conduit to space the coil from said outer surface, the other edge of the coil slidably fitting on the outside of the flanged edge of the adjacent coil, the space between the coil and the outer surface of the conduit comprising an air gap, at least the top half of said coils being imperforate, the bottom half of said coils containing apertures to provide for the flow of air through the coil, said coils comprising interconnected turns of a helically coiled metal strip.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |