Patent US4601988A successfully refreshed from Google Patents.
US4601988A
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Dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1985-11-25
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Granted: 1986-07-22
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Expires: 2005-11-25
Abstract
Abstract A dielectric ceramic composition consists essentially of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , Pb(Zn 1/2 W 1/2 )O 3 and Pb(Cu 1/3 Nb 2/3 )O 3 , the mole percentages of said four components being as follows: Pb(Ni 1/3 Nb 2/3 )O 3 --50.0 to 75.0 mole % PbTiO 3 --20.0 to 35.0 mole % Pb(Zn 1/2 W 1/2 )O 3 --0.5 to 15.0 mole % Pb(Cu 1/3 Nb 2/3 )O 3 --1.0 to 10.0 mole % The dielectric ceramic composition may further contain, as an additive, manganese in an amount of not more than 0.5 mole % in terms of MnO 2 . The composition possesses a high dielectric constant of not less than 8000 and a low sintering temperature of 900° to 1000° C.
Inventors
- 👤 Yukio Sakabe
- 👤 Goro Nishioka
- 👤 Junichi Imanari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:59
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; H01G4/1263
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
A dielectric ceramic composition consisting essentially of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , Pb(Zn 1/2 W 1/2 )O 3 and Pb(Cu 1/3 Nb 2/3 )O 3 , the mole percentages of said four components being as follows: Pb(Ni 1/3 Nb 2/3 )O 3 --50.0 to 75.0 mole % PbTiO 3 --20.0 to 35.0 mole % Pb(Zn 1/2 W 1/2 )O 3 --0.5 to 15.0 mole % Pb(Cu 1/3 Nb 22/3 )O 3 --1.0 to 10.0 mole %
Claim 2
Dependent Claim
81 words
A dielectric ceramic composition consisting essentially of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , Pb(Zn 1/2 W 1/2 )O 3 and Pb(Cu 1/3 Nb 2/3 )O 3 , the mole percentages of said four components being as follows: Pb(Ni 1/3 Nb 2/3 )O 3 --50.0 to 75.0 mole % PbTiO 3 --20.0 to 35.0 mole % Pb(Zn 1/2 W 1/2 )O 3 --0.5 to 15.0 mole % Pb(Cu 1/3 Nb 22/3 )O 3 --1.0 to 10.0 mole %
Claim 3
Dependent Claim
86 words
The dielectric ceramic composition according to claim 1 further containing, as an additive, manganese in an amount of not more than 0.5 mole % in terms of MnO 2 with respect to one mole of the basic composition consisting of 50.0 to 75.0 mole % of Pb(Ni 1/3 Nb 2/3 )O 3 , 20.0 to 35.0 mole % of PbTiO 3 , 0.5 to 15.0 mole % of Pb(Zn 1/2 W 1/2 )O 3 and 1.0 to 10.0 mole % of Pb(Cu1/3Nb 2/3 )O 3 .
Claim 4
Dependent Claim
32 words
The dielectric ceramic composition according to claim 1 wherein the composition has a high dielectric constant of not less than 8000 and a low sintering temperature ranging from 900° to 1000° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |