EP0452125A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Heater and catalytic converter
Assignee: NGK Insulators Ltd
•
Filing: 1991-04-11
•
Granted: —
•
Expires: 2011-04-11
Abstract
Abstract An electrically conductive honeycomb body, preferably extruded from a metal powder slurry, is used to make a resistance heater by providing electrode sites (11). Such a heater may e.g. be placed upstream of a catalytic converter including a main catalyst. Or, a catalytic converter may include the electrodes (11) to energise it, in addition to catalyst carried on its honeycomb structure. The honeycomb body is formed with predetermined structural non-uniformities so as to influence its resistance characteristics between the electrodes (11). The non-uniformities may be slits (12) cut into the body. Other examples include variations of cell wall thickness through the body, variations of axial cell wall length over the body, and interruption of isolated cell walls at predetermined positions.
Inventors
- 👤 Hiroshige Mizuno
- 👤 Fumio Abe
- 👤 Takashi Harada
- 👤 Tomoharu Kondo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:11
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; B; B01; B01J; B01J35/00; B01J35/50; B01J35/56; B01J35/57; B01J35/30; B01J35/33; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1103; B22F3/1115; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2013; F01N3/2026; F01N3/24; F01N3/28; F01N3/2803; F01N2330/00; F01N2330/14; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
51 words
A resistance adjusting type heater, comprising: a honeycomb structure having a large number of passages; at least two electrodes for energizing said honeycomb structure, provided on said honeycomb structure; and a resistance adjusting means provided between said electrodes to heat a gas flow through said passages formed in said honeycomb structure.
Claim 2
Dependent Claim
31 words
A resistance adjusting type heater according to claim 1, wherein said honeycomb structure is produced by extruding powder material into a shape of honeycomb configuration and then by sintering said shape.
Claim 3
Dependent Claim
21 words
A resistance adjusting type heater according to claim 1 or 2, wherein said resistance adjusting means comprises at least one slit.
Claim 4
Dependent Claim
36 words
A resistance adjusting type heater according to claim 1 or 2, wherein said resistance adjusting means comprises variations in the length of a cell wall in an axial direction of the passages of said honeycomb structure.
Claim 5
Dependent Claim
27 words
A resistance adjusting type heater according to claim 1 or 2, wherein said resistance adjusting means comprises variations in the cell wall thickness of said honeycomb structure.
Claim 6
Dependent Claim
25 words
A resistance adjusting type heater according to claim 1 or 2, wherein said resistance adjusting means comprises variations in a cell density of said passages.
Claim 7
Dependent Claim
28 words
A resistance adjusting type heater according to claim 1 or 2, wherein said resistance adjusting means comprises a slit formed in a cell wall of said honeycomb structure.
Claim 8
Dependent Claim
68 words
A resistance adjusting type heater, comprising: a honeycomb structure having a large number of passages; and at least two electrodes provided on the honeycomb structure, the honeycomb structure having a slit which form a predetermined angle to the cell walls of the honeycomb structure so as to enable adjustment of resistance between the electrodes, so that a gas flow through the passages of the honeycomb structure is heated.
Claim 9
Dependent Claim
69 words
A catalytic converter comprising: a main monolith catalyst, and a resistance adjusting type heater placed upstream of said main monolith catalyst, said heater including a honeycomb structure having a large number of passages, at least two electrodes for energizing said honeycomb structure, provided on said honeycomb structure, and a resistance adjusting means provided between said electrodes to heat a gas flow through said passages formed in said honeycomb structure.
Claim 10
Dependent Claim
43 words
A catalytic converter comprising: a honeycomb structure having a large number of passages; a catalyst carried on said honeycomb structure; at least two electrodes for energizing said honeycomb structure, provided on said honeycomb structure; and a resistance adjusting means provided between said electrodes.
Claim 11
Dependent Claim
51 words
A catalytic converter comprising: a main monolith catalyst, and a heater including a honeycomb structure having a large number of passages, a catalyst carried on said honeycomb structure, at least two electrodes for energizing said honeycomb structure, provided on said honeycomb structure, and a resistance adjusting means provided between said electrodes.
Claim 12
Dependent Claim
28 words
A catalytic converter according to claim 10 or 11, wherein said honeycomb structure is produced by extruding powder material into a honeycomb configuration and by sintering the honeycomb.
Claim 13
Independent Claim
49 words
A method of making a honeycomb structure resistance heater or catalytic converter having spaced electrode locations (11) provided on a honeycomb structure having a large number of passages, characterised by adjusting the resistance characteristic of the structure by forming it with incorporated structural non-uniformities (12,14,15) in a predetermined pattern.
Claim 14
Dependent Claim
67 words
A method according to claim 13 in which the structural non-uniformities comprise: (i) a slit or slits (12) cut into the honeycomb structure and extending plural cell dimensions; (ii) a slit or slits (15) interrupting substantially isolated cell walls in the structure; (iii) variations in the cell wall thickness of the honeycomb structure, or (iv) variations (14) in the cell wall axial length over the honeycomb structure.
Claim 15
Dependent Claim
26 words
A method according to claim 13 or claim 14 in which the honeycomb structure is formed by extrusion of a powder composition, preferably of metal powder.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.