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US4711862A
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Dielectric ceramic compositions
Assignee: Panasonic Holdings Corp
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Filing: 1985-12-26
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Granted: 1987-12-08
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Expires: 2005-12-26
Abstract
Abstract A dielectric ceramic composition consisting essentially of: PbTix(Mg1/3Nb2/3)y(Ni1/2W1/2)zO3 wherein x+y+z=1, which allows low-temperature sintering and has a high dielectric constant, a low dielectric loss and a high specific resistivity.
Inventors
- 👤 Yoichiro Yokotani
- 👤 Junichi Kato
- 👤 Masamitsu Nishida
- 👤 Syunichiro Kawashima
- 👤 Hiromu Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:55
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
A ceramic compositions comprising a substance represented by the formula PbTi.sub.x (Mg.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3 wherein x+y+z=1 and the values of x,y and z fall within the ranges represented by the polygon ABCDE in the accompanying composition diagram of PbTiO 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/2 W 1/2 )O 3 ternary system.
Claim 2
Dependent Claim
56 words
A ceramic compositions comprising a substance represented by the formula PbTi.sub.x (Mg.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3 wherein x+y+z=1 and the values of x,y and z fall within the ranges represented by the polygon ABCDE in the accompanying composition diagram of PbTiO 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/2 W 1/2 )O 3 ternary system.
Claim 3
Dependent Claim
102 words
A ceramic composition comprising a substance represented by the formula PbTi.sub.x (Mg.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3 wherein x+y+z=1 and the values of x, y and z fall within the ranges represented by the polygon ABCDE in the accompanying composition diagram of PbTiO 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/2 W 1/2 )O 3 ternary system and at least one element selected from the group consisting of Mn, Cr, Co and Mo in an amount in total equivalent to from 0.03 to 0.60 weight percent of respective oxides MnO 2 , Cr 2 O 3 , CoO and MoO 3 .
Claim 4
Dependent Claim
102 words
A ceramic composition comprising a substance represented by the formula PbTi.sub.x (Mg.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3 wherein x+y+z=1 and the values of x, y and z fall within the ranges represented by the polygon ABCDE in the accompanying composition diagram of PbTiO 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/2 W 1/2 )O 3 ternary system and at least one element selected from the group consisting of Mn, Cr, Co and Mo in an amount in total equivalent to from 0.03 to 0.60 weight percent of respective oxides MnO 2 , Cr 2 O 3 , CoO and MoO 3 .
Claim 5
Dependent Claim
101 words
A ceramic composition comprising a substance represented by the formula PbTi.sub.x (Mg.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3 wherein x+y+z=1 and the values of x, y and z fall within the ranges represented by the polygon ABCDE in the accompanying composition diagram of PbTiO 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/2 W 1/2 )O 3 ternary system and at least one element selected from the group consisting of Pb(Mn 1/3 Nb 2/3 )O 3 , Pb(Mn 1/2 W 1/2 )O 3 and Pb(Mn 1/3 Sb 2/3 )O 3 in an amount in total equivalent to from 0.50 to 2.50 weight percent.
Claim 6
Dependent Claim
101 words
A ceramic composition comprising a substance represented by the formula PbTi.sub.x (Mg.sub.1/3 Nb.sub.2/3).sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.3 wherein x+y+z=1 and the values of x, y and z fall within the ranges represented by the polygon ABCDE in the accompanying composition diagram of PbTiO 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/2 W 1/2 )O 3 ternary system and at least one element selected from the group consisting of Pb(Mn 1/3 Nb 2/3 )O 3 , Pb(Mn 1/2 W 1/2 )O 3 and Pb(Mn 1/3 Sb 2/3 )O 3 in an amount in total equivalent to from 0.50 to 2.50 weight percent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |