US4427418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for collecting particulates in exhaust gases
Assignee: Toyota Central R&D Labs Inc
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Filing: 1982-03-09
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Granted: 1984-01-24
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Expires: 2002-03-09
Abstract
Abstract A device for collecting and burning particulates in exhaust gases from an internal combustion engine comprises: a casing having an inlet port and a discharge port for exhaust gases; at least one trapper of porous and heat resistant material disposed within the casing; and a plurality of electric heaters separately disposed a predetermined distance apart from each other on or adjacent to a surface of the trapper which confronts the inlet port and connected to a power source, each of said electric heaters having a predetermined heating area. This device effectively collects and burns particulates in exhaust gases with reduced amount of electric power.
Inventors
- 👤 Takeshi Kogiso
- 👤 Hiroshi Ohkawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:32
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/027; F01N3/031; F01N3/032; F01N2410/00; F01N2410/04; Y; Y10; Y10S; Y10S55/00; Y10S55/10; Y10S55/30
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
145 words
A device for collecting particulates in exhaust gases from an internal combustion engine comprising: a casing having an inlet port and a discharge port for introducing and discharging said exhaust gases; at least one trapper of porous and heat resistant material disposed within said casing between said inlet and discharge ports, for collecting particulates in said exhaust gases; and a plurality of electric resistance heaters to facilitate ignition and burning of particulates collected in said at least one trapper, the heaters being separately disposed a predetermined distance apart from each other substantially in contact with a surface of said at least one trapper which confronts said inlet port and connected to a power source such that they are successively energized one by one, each of said plurality of electric resistance heaters having a predetermined heating area on said surface of said at least one trapper.
Claim 2
Independent Claim
145 words
A device for collecting particulates in exhaust gases from an internal combustion engine comprising: a casing having an inlet port and a discharge port for introducing and discharging said exhaust gases; at least one trapper of porous and heat resistant material disposed within said casing between said inlet and discharge ports, for collecting particulates in said exhaust gases; and a plurality of electric resistance heaters to facilitate ignition and burning of particulates collected in said at least one trapper, the heaters being separately disposed a predetermined distance apart from each other substantially in contact with a surface of said at least one trapper which confronts said inlet port and connected to a power source such that they are successively energized one by one, each of said plurality of electric resistance heaters having a predetermined heating area on said surface of said at least one trapper.
Claim 3
Dependent Claim
24 words
A device according to claim 1, wherein each of said electric resistance heaters has a heating area of 0.2 to 3 cm 2 .
Claim 4
Dependent Claim
31 words
A device according to claim 2, wherein said plurality of electric resistance heaters are disposed substantially evenly spaced apart from each other on said surface of said at least one trapper.
Claim 5
Dependent Claim
22 words
A device according to claim 3, wherein said at least one trapper is formed of a porous body of ceramics having through-holes.
Claim 6
Dependent Claim
28 words
A device according to claim 4 wherein said plurality of electric-resistance heaters are fixed to a holding member which is resiliently pressed against said at least one trapper.
Claim 7
Dependent Claim
55 words
A device according to claim 3, wherein said at least one trapper is formed of a porous body of ceramics having through-holes and said plurality of electric-resistance heaters are grouped, each group comprising at least two electric-resistance heaters, and are connected to said power source such that they are successively energized one group after another.
Claim 8
Dependent Claim
28 words
A device according to claim 6, wherein all of said electric-resistance heaters are fixed to a holding member which is resiliently pressed against said at least one trapper.
Claim 9
Dependent Claim
25 words
A device according to claim 2, wherein said plurality of electric-resistance heaters are disposed a distance of 0.5 to 5 cm apart from each other.
Claim 10
Dependent Claim
39 words
A device according to claim 2, wherein said plurality of electric-resistance heaters are grouped, each group comprising at least two electric-resistance heaters, and are connected to said power source such that they are successively energized one group after another.
Claim 11
Dependent Claim
30 words
A device according to claim 2, wherein said plurality of electric-resistance heaters are fixed to a holding member, said holding member being resiliently pressed against said at least one trapper.
Claim 12
Dependent Claim
20 words
A device according to claim 2, wherein said plurality of electric-resistance heaters are fixed to said at least one trapper.
Claim 13
Dependent Claim
19 words
A device according to claim 2, wherein said at least one trapper has a porosity of 60 to 85%.
Claim 14
Dependent Claim
20 words
A device according to claim 2, wherein said at least one trapper is formed of a porous body of ceramics.
Claim 15
Dependent Claim
20 words
A device according to claim 2, wherein said at least one trapper is formed of tangled ceramic coated metal wires.
Claim 16
Dependent Claim
17 words
A device according to claim 2, wherein said at least one trapper is formed of ceramic fibers.
Claim 17
Dependent Claim
14 words
A device according to claim 2, wherein said casing comprises a single cylindrical body.
Claim 18
Dependent Claim
48 words
A device according to claim 2, wherein said casing comprises a double cylindrical body having two divided spaces therein and a change-over valve for introducing exhaust gases into one or said two divided spaces and preventing exhaust gases from flowing into the other of said two divided spaces.
Claim 19
Dependent Claim
19 words
A device according to claim 1, wherein at least one of the electric heaters is disposed on said surface.
Claim 20
Dependent Claim
20 words
A device according to claim 1, wherein at least one of the electric heaters is disposed adjacent to said surface.
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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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |