| US 7,342,201 B1 | ||
| Silcon carbide element | ||
| Martin Heuberger, Saarbrücken (Germany); Michael Kuntz, Homburg (Germany); and Rüdiger Nass, Riegelsberg (Germany) | ||
| Assigned to Nanogate AG, Saarbrucken (Germany) | ||
| Appl. No. 10/148,038 PCT Filed Nov. 25, 2000, PCT No. PCT/DE00/04205 § 371(c)(1), (2), (4) Date Sep. 16, 2002, PCT Pub. No. WO01/38254, PCT Pub. Date May 31, 2001. |
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| Claims priority of application No. 199 56 767 (DE), filed on Nov. 25, 1999. | ||
| Int. Cl. F23Q 7/00 (2006.01); H05B 1/02 (2006.01) | ||
| U.S. Cl. 219—270 [219/505; 219/552; 219/553; 219/260; 29/611; 361/264] | 20 Claims |
| 1. An electrical heating element, comprising:
a ceramic body having electrical NTC properties the ceramic body comprising pressureless sintered SiC obtained from SiC particles,
said body doped with nitrogen; and
at least a portion of said body having an extent of nitrogen doping which is different from other portions of said body;
wherein said portion is formed by a series resistor having PTC properties;
wherein the series resistor is part of an incandescent bulb.
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