Patent US4859641A successfully refreshed from Google Patents.
US4859641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonreducible dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1988-03-09
•
Granted: 1989-08-22
•
Expires: 2008-03-09
Abstract
Abstract A nonreducible dielectric ceramic composition consists essentially of a main component expressed by the formula: (Sr.sub.1-x Ca.sub.x).sub.m (Ti.sub.1-y Zr.sub.y)O.sub.3 wherein x an dy are molar fractions of the respective elements, and m is molar ratio of (Sr 1-x Ca x ) to (Ti 1 -yZr y ), and wherein x, y and m take values within the following respective ranges: 0.30≦x≦0.50, 0.03≦y≦0.20, 0.95≦m≦1.08, and secondary components composed of at least manganese oxides and SiO 2 . The content of each secondary component per 100 parts by weight of the main component is 0.01 to 2.00 parts by weight for manganese oxides in terms of MnO 2 , and 0.10 to 4.00 parts by weight for SiO 2 . The composition may contain, as one of the secondary components, 0.01 to 1.00 parts by weight of MgO or ZnO per 100 parts by weight of the main component. The composition is useful as material for multilayer ceramic capacitors.
Inventors
- 👤 Masaru Fujino
- 👤 Goro Nishioka
- 👤 Yukio Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:38
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; C04B35/48; C04B35/49
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A nonreducible dielectric ceramic composition consisting essentially of a main component expressed by the formula: (Sr.sub.1-x Ca.sub.x).sub.m (Ti.sub.1-y Zr.sub.y)O.sub.3 wherein the subscripts x and y are molar fractions of the respective elements, and m is molar ratio of (Sr 1-x Ca x ) to (Ti 1-y Zr y ), and wherein x, y and m take values within the following respective ranges: 0.30≦x≦0.50, 0.03≦y≦0.20, 0.95<m≦1.08, and secondary components composed of manganese oxides and SiO 2 , the content of each secondary component per 100 parts by weight of the main component being 0.01 to 2.00 parts by weight for manganese oxides in terms of MnO 2 , and 0.10 to 4.00 parts by weight for SiO 2 .
Claim 2
Dependent Claim
118 words
A nonreducible dielectric ceramic composition consisting essentially of a main component expressed by the formula: (Sr.sub.1-x Ca.sub.x).sub.m (Ti.sub.1-y Zr.sub.y)O.sub.3 wherein the subscripts x and y are molar fractions of the respective elements, and m is molar ratio of (Sr 1-x Ca x ) to (Ti 1-y Zr y ), and wherein x, y and m take values within the following respective ranges: 0.30≦x≦0.50, 0.03≦y≦0.20, 0.95<m≦1.08, and secondary components composed of manganese oxides and SiO 2 , the content of each secondary component per 100 parts by weight of the main component being 0.01 to 2.00 parts by weight for manganese oxides in terms of MnO 2 , and 0.10 to 4.00 parts by weight for SiO 2 .
Claim 3
Dependent Claim
43 words
A non-reducible dielectric ceramic composition according to claim 1 in which m is 0.99, x is 0.4, y is 0.1, the amount of manganese oxide in terms of MnO 2 is 0.5 and the amount of SiO 2 is at least 2 parts.
Claim 4
Dependent Claim
128 words
A nonreducible dielectric ceramic composition consisting essentially of a main component expressed by the formula: (Sr.sub.1-x Ca.sub.x).sub.m (Ti.sub.1-y Zr.sub.y)O.sub.3 wherein the subscripts x and y are molar fractions of the respective elements, and m is a molar ratio of (Sr 1-x Ca x ) to (Ti 1-y Zr y ) , and wherein x, y and m take values within the following respective ranges: 0.30≦x<0.50, 0.03≦y<0.20, 0.95≦m≦1.08, and secondary components composed of manganese oxides, SiO 2 and MgO, the content of each secondary component per 100 parts by weight of the main component being 0.01 to 2.00 parts by weight for manganese oxides in terms of MnO 2 , 0.10 to 4.00 parts by weight for SiO 2 , and 0.01 to 1.00 parts by weight for MgO.
Claim 5
Dependent Claim
128 words
A nonreducible dielectric ceramic composition consisting essentially of a main component expressed by the formula: (Sr.sub.1-x Ca.sub.x).sub.m (Ti.sub.1-y Zr.sub.y)O.sub.3 wherein the subscripts x and y are molar fractions of the respective elements, and m is a molar ratio of (Sr 1-x Ca x ) to (Ti 1-y Zr y ) , and wherein x, y and m take values within the following respective ranges: 0.30≦x<0.50, 0.03≦y<0.20, 0.95≦m≦1.08, and secondary components composed of manganese oxides, SiO 2 and MgO, the content of each secondary component per 100 parts by weight of the main component being 0.01 to 2.00 parts by weight for manganese oxides in terms of MnO 2 , 0.10 to 4.00 parts by weight for SiO 2 , and 0.01 to 1.00 parts by weight for MgO.
Claim 6
Dependent Claim
20 words
A non-reducible dielectric ceramic composition according to claim 3 in which the amount of MgO is at least 0.3 part.
Claim 7
Dependent Claim
43 words
A non-reducible dielectric ceramic composition according to claim 4 in which m is 0.99, x is 0.4, y is 0.1, the amount of manganese oxide in terms of MnO 2 is 0.5 and the amount of SiO 2 is at least 2 parts.
Claim 8
Dependent Claim
128 words
A nonreducible dielectric ceramic composition consisting essentially of a main component expressed by the formula: (Sr.sub.1-x Ca.sub.x).sub.m (Ti.sub.1-y Zr.sub.y)O.sub.3 wherein the subscripts x and y are molar fractions of the respective elements, and m is a molar ratio of (Sr 1-x Ca x ) to (Ti 1-y Zr y ) , and wherein x, y and m take values within the following respective ranges: 0.30≦x≦0.50, 0.03≦y≦0.20, 0.95≦m≦1.08, and secondary components composed of manganese oxides, SiO 2 and ZnO, the content of each secondary component per 100 parts by weight of the main component being 0.01 to 2.00 parts by weight for manganese oxides in terms of MnO 2 , 0.10 to 4.00 parts by weight for SiO 2 , and 0.01 to 1.00 parts by weight for ZnO.
Claim 9
Dependent Claim
128 words
A nonreducible dielectric ceramic composition consisting essentially of a main component expressed by the formula: (Sr.sub.1-x Ca.sub.x).sub.m (Ti.sub.1-y Zr.sub.y)O.sub.3 wherein the subscripts x and y are molar fractions of the respective elements, and m is a molar ratio of (Sr 1-x Ca x ) to (Ti 1-y Zr y ) , and wherein x, y and m take values within the following respective ranges: 0.30≦x≦0.50, 0.03≦y≦0.20, 0.95≦m≦1.08, and secondary components composed of manganese oxides, SiO 2 and ZnO, the content of each secondary component per 100 parts by weight of the main component being 0.01 to 2.00 parts by weight for manganese oxides in terms of MnO 2 , 0.10 to 4.00 parts by weight for SiO 2 , and 0.01 to 1.00 parts by weight for ZnO.
Claim 10
Dependent Claim
19 words
A non-reducible dielectric ceramic composition according to claim 3 in which the amount ZnO is at least 0.3 part.
Claim 11
Dependent Claim
43 words
A non-reducible dielectric ceramic composition according to claim 7 in which m is 0.99, x is 0.4, y is 0.1, the amount of manganese oxide in terms of MnO 2 is 0.5 and the amount of SiO 2 is at least 2 parts.
References Cited (Backward Citations)
US4438214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |