US5202547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance adjusting type heater
Assignee: NGK Insulators Ltd
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Filing: 1992-02-28
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Granted: 1993-04-13
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Expires: 2012-02-28
Abstract
Abstract A resistance adjusting type heater has a honeycomb structure having a large number of passages, at least two electrodes to enable electrical heating of the honeycomb structure provided on the honeycomb structure, and a resistance adjusting means, a slit, provided between the electrodes. The thicknesses of passage walls at the portions of the honeycomb structure at which electricity flows at a very high density are increased with a conductive material to prevent the abnormal heat generation at the portions of the honeycomb structure.
Inventors
- 👤 Fumio Abe
- 👤 Hiroshige Mizuno
- 👤 Takashi Harada
- 👤 Tomoharu Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:28
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/30; B01J35/33; 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; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; F01N2330/00; F01N2330/02; F01N2330/04; F01N2510/00; F01N2510/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A resistance adjusting type heater comprising: a honeycomb structure having a number of passages defined by passage walls; at least two electrodes in electrical contact with said honeycomb structure; and at least one slit extending at least partially through said honeycomb structure to alter the electrical resistance thereof, wherein a passage wall defining a front edge of said slit where said slit terminates in said honeycomb structure has an increased thickness, said edge corresponding to an area of relatively high current density.
Claim 2
Dependent Claim
82 words
A resistance adjusting type heater comprising: a honeycomb structure having a number of passages defined by passage walls; at least two electrodes in electrical contact with said honeycomb structure; and at least one slit extending at least partially through said honeycomb structure to alter the electrical resistance thereof, wherein a passage wall defining a front edge of said slit where said slit terminates in said honeycomb structure has an increased thickness, said edge corresponding to an area of relatively high current density.
Claim 3
Dependent Claim
18 words
The heater of claim 1, wherein a plurality passage walls surrounding said front edge have an increased thickness.
Claim 4
Dependent Claim
78 words
A resistance adjusting type heater comprising: a honeycomb structure having a number of passages; at least two electrodes in electrical contact with said honeycomb structure; and at least one slit extending at least partially through said honeycomb structure to alter the electrical resistance thereof, wherein conductive material is disposed within a passage along a front edge of said slit where said slit terminates in said honeycomb structure, said edge corresponding to an area of relatively high current density.
Claim 5
Dependent Claim
78 words
A resistance adjusting type heater comprising: a honeycomb structure having a number of passages; at least two electrodes in electrical contact with said honeycomb structure; and at least one slit extending at least partially through said honeycomb structure to alter the electrical resistance thereof, wherein conductive material is disposed within a passage along a front edge of said slit where said slit terminates in said honeycomb structure, said edge corresponding to an area of relatively high current density.
Claim 6
Dependent Claim
18 words
The heater of claim 3, wherein a plurality passages surrounding said front edge are filled with conductive material.
References Cited (Backward Citations)
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GB1492929A
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JPS6167609A
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US4717813A
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EP0283220A1
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WO1989010471A1
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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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |