US4449039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic heater
Assignee: Denso Corp
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Filing: 1982-09-07
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Granted: 1984-05-15
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Expires: 2002-09-07
Abstract
Abstract A ceramic heater having a heating element of a sintered mixture comprising alumina and titanium nitride and/or titanium carbide. The heating element has a specific resistance in a range from 10 -4 to several Ωcm. The ceramic heater may have supporting substrates of insulating materials with which the heating element is covered. The ceramic heater can be used at a temperature above 1000° C.
Inventors
- 👤 Takeshi Fukazawa
- 👤 Shunzo Yamaguchi
- 👤 Morihiro Atsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:51
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A ceramic heater having a heating element composed of a sintered body of a powdery mixture consisting essentially of from 50 to 90% by weight of alumina, from 10 to 50 of a member selected from the group consisting of titanium nitride, titanium carbide and a mixture thereof, and from 0.05 to 7.5% by weight nickel.
Claim 2
Dependent Claim
56 words
A ceramic heater having a heating element composed of a sintered body of a powdery mixture consisting essentially of from 50 to 90% by weight of alumina, from 10 to 50 of a member selected from the group consisting of titanium nitride, titanium carbide and a mixture thereof, and from 0.05 to 7.5% by weight nickel.
Claim 3
Dependent Claim
21 words
A ceramic heater according to claim 1, wherein said powdery mixture further contains from 0.05 to 5% by weight magnesium oxide.
Claim 4
Dependent Claim
28 words
A ceramic heater according to claim 1, wherein said powdery mixture further contains a member selected from the group consisting of chromium, chromium carbide and a mixture thereof.
Claim 5
Dependent Claim
18 words
A ceramic heater according to claim 1, wherein said heating element is positioned on an insulating support substrate.
Claim 6
Dependent Claim
29 words
A ceramic heater according to claim 4, wherein said heating element is covered with an insulating covering substrate except the surfaces connected with at least a pair of terminals.
Claim 7
Dependent Claim
13 words
A ceramic heater according to claim 5, wherein said substrates are sintered alumina.
Claim 8
Dependent Claim
13 words
A ceramic heater according to claim 4, wherein said substrate is sintered alumina.
References Cited (Backward Citations)
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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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |