US3863445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shields for exhaust system
Assignee: Tenneco Inc
•
Filing: 1972-08-04
•
Granted: 1975-02-04
•
Expires: 1992-08-04
Abstract
Abstract External baffles are attached to hot portions of conduits in catalytic emission control exhaust systems to provide means to protect and shield the surrounding environment and dissipate heat.
Inventors
- 👤 Robert A Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/14; F01N13/08; F01N13/082
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
In a vehicle having an internal combustion engine with a catalytic exhaust system including a catalyst converter unit for reducing the quantity of unburned emissions in the exhaust gas, a pipe on the underside of the vehicle and connected to the converter to conduct exhaust gases away from the converter, an imperforate upper metal plate mounted adjacent the pipe and spaced from and above it to serve as a heat shield protecting the underside of the vehicle body, and at least one lower plate mounted adjacent the pipe and spaced from and below it, said lower plate being perforated.
Claim 2
Dependent Claim
99 words
In a vehicle having an internal combustion engine with a catalytic exhaust system including a catalyst converter unit for reducing the quantity of unburned emissions in the exhaust gas, a pipe on the underside of the vehicle and connected to the converter to conduct exhaust gases away from the converter, an imperforate upper metal plate mounted adjacent the pipe and spaced from and above it to serve as a heat shield protecting the underside of the vehicle body, and at least one lower plate mounted adjacent the pipe and spaced from and below it, said lower plate being perforated.
Claim 3
Dependent Claim
32 words
A vehicle as set forth in claim 1 having an exhaust system wherein said plates have indentations formed therein and contacting the pipe and serving to space the plates from the pipe.
Claim 4
Dependent Claim
22 words
A vehicle as set forth in claim 2 having an exhaust system including clamp means for clamping the plates to the pipe.
Claim 5
Dependent Claim
43 words
A vehicle as set forth in claim 3 having an exhaust system wherein the upper and lower plates are concave with respect to the pipe and fit together so that the assembly of the two plates entirely surrounds a portion of the pipe.
Claim 6
Dependent Claim
29 words
A vehicle as set forth in claim 4 having an exhaust system including hanger means connected to the clamp means for supporting the pipe and plates on said vehicle.
Claim 7
Dependent Claim
36 words
A vehicle as set forth in claim 4 having an exhaust system wherein the lower plate is corrugated, the corrugations extending transversely to the length of the pipe and contacting the pipe to provide said indentations.
Claim 8
Dependent Claim
41 words
A vehicle as set forth in claim 2 having an exhaust system wherein the upstream ends of the plates are necked down into contact with the pipe to inhibit entry of foreign matter into the space between the plates and pipe.
References Cited (Backward Citations)
US1793813A
Cited
US2138001A
Cited
US3116803A
Cited
US3168806A
Cited
US3237716A
Cited
US3404750A
Cited
US3602334A
Cited
US3677365A
Cited
US3677364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |