US5397753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonreducible dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1994-01-06
•
Granted: 1995-03-14
•
Expires: 2014-01-06
Abstract
Abstract A nonreducible dielectric ceramic composition consists essentially of: a primary component consisting essentially of 92.0 to 99.4 mol % of BaTiO 3 , 0.3 to 4.0 mol % of at least one of rare earth element, expressed by the general formula: Re 2 O 3 , where Re is at least one rare earth element selected from the group consisting of Tb, Dy, Ho and Er, and 0.3 to 4.0 mol % of Co 2 O 3 ; a secondary component consisting essentially of BaO, MnO, MgO, and BaZrO 3 , the content of the secondary component being, per 100 moles of the primary component, 0.2 to 4.0 moles for BaO, 0.2 to 3.0 moles for MnO, 0.5 to 5 moles for MgO, and 0.5 to 4.0 moles for BaZrO 3 ; and a vitreous component of a BaO--SrO--Li 2 O--SiO 2 system, the content of the vitreous component being 0.5 to 2.5 parts by weight per 100 parts by weight of the sum of the primary and secondary components.
Inventors
- 👤 Toshiki Nishiyama
- 👤 Yukio Hamaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:35
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
170 words
A nonreducible dielectric ceramic composition consists essentially of: a primary component consisting essentially of 92.0 to 99.4 mol % of BaTiO 3 , 0.3 to 4.0 mol % of at least one of rare earth element, expressed by the general formula: Re 2 O 3 , where Re is at least one rare earth element selected from the group consisting of Tb, Dy, Ho and Er, and 0.3 to 4.0 mol % of Co 2 O 3 ; a secondary component consisting essentially of BaO, MnO, MgO, and BaZrO 3 , the content of the secondary component being, per 100 moles of the primary component, 0.2 to 4.0 moles for BaO, 0.2 to 3.0 moles for MnO, 0.5 to 5 moles for MgO, and 0.5 to 4.0 moles for BaZrO 3 ; and a vitreous component of a BaO--SrO--Li 2 O--SiO 2 system, the content of the vitreous component being 0.5 to 2.5 parts by weight per 100 parts by weight of the sum of the primary and secondary components.
Claim 2
Dependent Claim
170 words
A nonreducible dielectric ceramic composition consists essentially of: a primary component consisting essentially of 92.0 to 99.4 mol % of BaTiO 3 , 0.3 to 4.0 mol % of at least one of rare earth element, expressed by the general formula: Re 2 O 3 , where Re is at least one rare earth element selected from the group consisting of Tb, Dy, Ho and Er, and 0.3 to 4.0 mol % of Co 2 O 3 ; a secondary component consisting essentially of BaO, MnO, MgO, and BaZrO 3 , the content of the secondary component being, per 100 moles of the primary component, 0.2 to 4.0 moles for BaO, 0.2 to 3.0 moles for MnO, 0.5 to 5 moles for MgO, and 0.5 to 4.0 moles for BaZrO 3 ; and a vitreous component of a BaO--SrO--Li 2 O--SiO 2 system, the content of the vitreous component being 0.5 to 2.5 parts by weight per 100 parts by weight of the sum of the primary and secondary components.
Claim 3
Dependent Claim
25 words
The nonreducible dielectric ceramic composition according to claim 1 wherein the content of inevitable impurities in BaTiO 3 is not more than 0.04% by weight.
Claim 4
Dependent Claim
19 words
The nonreducible dielectric ceramic composition according to claim 2 said inevitable impurities in BaTiO 3 are alkaline metal oxides.
Claim 5
Dependent Claim
52 words
The nonreducible dielectric ceramic composition according to claim 1 wherein said vitreous component has a composition consisting essentially of 5 to 20 mol % of BaO, 5 to 20 mol % of SrO, 2 to 45 mol % of Li 2 O and 30 to 70 mol % of SiO 2 .
Claim 6
Dependent Claim
25 words
The nonreducible dielectric ceramic composition according to claim 4 wherein the content of inevitable impurities in BaTiO 3 is not more than 0.04% by weight.
Claim 7
Dependent Claim
20 words
The nonreducible dielectric ceramic composition according to claim 5 wherein the inevitable impurities in BaTiO 3 are alkaline metal oxides.
Claim 8
Dependent Claim
16 words
The nonreducible dielectric ceramic composition of claim 1 in which the rare earth element is Tb.
Claim 9
Dependent Claim
16 words
The nonreducible dielectric ceramic composition of claim 1 in which the rare earth element is Dy.
Claim 10
Dependent Claim
16 words
The nonreducible dielectric ceramic composition of claim 1 in which the rare earth element is Ho.
Claim 11
Dependent Claim
16 words
The nonreducible dielectric ceramic composition of claim 1 in which the rare earth element is Er.
References Cited (Backward Citations)
JPS6114611A
Cited
JPS63103861A
Cited
US4859641A
Cited
US5103369A
Cited
US5202814A
Cited
US5268342A
Cited
US5204301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |