Stock material or miscellaneous articles – Composite – Of silicon containing
Reexamination Certificate
2006-07-27
2011-10-04
Speer, Timothy (Department: 1784)
Stock material or miscellaneous articles
Composite
Of silicon containing
C428S450000, C428S901000
Reexamination Certificate
active
08029903
ABSTRACT:
Provided are a silicon nitride substrate and a silicon nitride circuit board with excellent electrical characteristics, and power control parts utilizing them.A silicon nitride substrate comprises a silicon nitride sintered body obtainable by sintering a silicon nitride powder in the presence of a sintering aid comprising MgO, Y2O3and SiO2in a proportion of (1) MgO/(MgO+SiO2)=34-59 mol %, and (2) Y2O3/(Y2O3+SiO2)=50-66 mol %, and a silicon nitride circuit board utilizes it.
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Fukazawa Motoharu
Gotoh Takeshi
Ohtsuka Tetsumi
Denki Kagaku Kogyo Kabushiki Kaisha
Langman Jonathan
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Speer Timothy
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