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
10558375
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.
REFERENCES:
patent: 5496619 (1996-03-01), Itagaki et al.
patent: 5725808 (1998-03-01), Tormey et al.
patent: 6136734 (2000-10-01), Jean et al.
patent: 7208043 (2007-04-01), Tachikawa et al.
patent: 7208434 (2007-04-01), Kim et al.
patent: 5-345662 (1993-12-01), None
patent: 8-139504 (1996-05-01), None
patent: 3083638 (2000-06-01), None
patent: 3083645 (2000-06-01), None
patent: 2000-344571 (2000-12-01), None
patent: 2001-130952 (2001-05-01), None
patent: 2002-104870 (2002-04-01), None
patent: 275192 (1971-02-01), None
Ohsato Hitoshi
Sugiyama Tomonori
Tsunooka Tsutomu
Group Karl E
Marusu Glaze Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
Yasufuku Ceramics Co., Ltd.
LandOfFree
High-frequency porcelain composition, process for producing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-frequency porcelain composition, process for producing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-frequency porcelain composition, process for producing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3943346