US4008570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for purifying exhaust gases
Assignee: Nissan Motor Co Ltd
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Filing: 1975-04-08
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Granted: 1977-02-22
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Expires: 1995-04-08
Abstract
Abstract Exhaust gases from an internal combustion are chemically decomposed in a catalytic converter and then oxidized in a thermal reactor.
Inventors
- 👤 Masanori Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:42
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2882; F01N3/18; F01N2250/00; F01N2250/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
An apparatus for purifying exhaust gases discharged from an internal combustion engine having an exhaust manifold, comprising: an exhaust gas pipe leading from said exhaust manifold to the atmosphere; a catalytic converter disposed in said exhaust gas pipe at a certain distance from the engine, said catalytic converter including a monolithic ceramic honeycomb cylinder which is formed with a thin wall structure and has a upstream end and a downstream end, said honeycomb cylinder being separated into a catalytic portion which is formed with a plurality of thin walls carrying a catalytic material and a passage portion other than said catalytic portion which is formed with a plurality of thin walls carrying no catalytic material and integral with the thin walls of said catalytic portion, said catalytic portion extending through said honeycomb cylinder from the upstream to downstream ends thereof and serves as a catalytic reactor, said passage portion extending through said honeycomb cylinder from the upstream to downstream ends thereof and serving as a mere passage for allowing the exhaust gases to pass through said honeycomb cylinder; and a thermal reactor disposed in said exhaust pipe downstream of said catalytic converter.
Claim 2
Independent Claim
192 words
An apparatus for purifying exhaust gases discharged from an internal combustion engine having an exhaust manifold, comprising: an exhaust gas pipe leading from said exhaust manifold to the atmosphere; a catalytic converter disposed in said exhaust gas pipe at a certain distance from the engine, said catalytic converter including a monolithic ceramic honeycomb cylinder which is formed with a thin wall structure and has a upstream end and a downstream end, said honeycomb cylinder being separated into a catalytic portion which is formed with a plurality of thin walls carrying a catalytic material and a passage portion other than said catalytic portion which is formed with a plurality of thin walls carrying no catalytic material and integral with the thin walls of said catalytic portion, said catalytic portion extending through said honeycomb cylinder from the upstream to downstream ends thereof and serves as a catalytic reactor, said passage portion extending through said honeycomb cylinder from the upstream to downstream ends thereof and serving as a mere passage for allowing the exhaust gases to pass through said honeycomb cylinder; and a thermal reactor disposed in said exhaust pipe downstream of said catalytic converter.
Claim 3
Dependent Claim
16 words
An apparatus as claimed in claim 1, in which said passage portion is in cylindrical form.
Claim 4
Dependent Claim
20 words
An apparatus as claimed in claim 1, in which said passage portion includes a plurality of portions in cylindrical form.
Claim 5
Dependent Claim
17 words
An apparatus as claimed in claim 3, in which said plurality of portions includes three cylindrical portions.
Claim 6
Dependent Claim
37 words
An apparatus as claimed in claim 1, in which said monolithic honeycomb cylinder is formed with a plurality of flat thin walls and a plurality of corrugated thin walls which are disposed between the flat thin walls.
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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |