Compositions: ceramic – Ceramic compositions – Refractory
Reexamination Certificate
2008-05-06
2008-05-06
Group, Karl E (Department: 1793)
Compositions: ceramic
Ceramic compositions
Refractory
C501S134000, C428S450000, C428S702000
Reexamination Certificate
active
07368407
ABSTRACT:
A sintering temperature can be lowered to 1,200° C. by adding from 15% by weight or more to 35% by weight or less of rutile-type titanium dioxide into forsterite. By carrying out sintering at such a low temperature, a sintered product can be obtained in which sintering was carried out while retaining the respective crystal phases of the forsterite and rutile-type titanium dioxide. Such a sintered product is an excellent high-frequency ceramic composition, wherein the high quality factor Q·f value derived from forsterite is hardly impaired, and, the absolute value of the temperature coefficient τfis controlled to 30 ppm/° C. or less by rutile-type titanium dioxide.
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Ohsato Hitoshi
Sugiyama Tomonori
Tsunooka Tsutomu
Group Karl E
Marusu Glaze Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
Yasufuku Ceramics Co., Ltd.
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