Compositions: ceramic – Ceramic compositions – Refractory
Reexamination Certificate
2005-07-19
2005-07-19
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Refractory
C501S098600, C252S518100, C252S521100
Reexamination Certificate
active
06919287
ABSTRACT:
An aluminum nitride material having a high thermal conductivity and reduced room temperature volume resistivity is provided. The aluminum nitride material has an interconnected intergranular phase that functions as an electrically conductive phase. The content of the conductive phase is not higher than 20 percent, calculated according to the following formula based on an X-ray diffraction profile: Content of the conductive phase (%)=(Integrated strength of the strongest peak of the conductive phase/Integrated strength of the strongest peak of aluminum nitride phase)×100. The aluminum nitride material has an electric current response index in a range of 0.9 to 1.1, defined according to the following formula: Electric current response index=(Electric current Aat 5 seconds after a voltage is applied/Electric current at 60 seconds after a voltage is applied).
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U.S. Appl. No. 10/704,997, filed Nov, 10, 2003, Teratani et al.
Katsuda Yuji
Teratani Naomi
Yoshikawa Jun
Burr & Brown
Group Karl
NGK Insulators Ltd.
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