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US4236928A
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Ceramic compositions
Assignee: NEC Corp
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Filing: 1979-10-26
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Granted: 1980-12-02
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Expires: 1999-10-26
Abstract
Abstract A ceramic composition consisting essentially of Pb(Fe 1/2 Nb 1/2 )O 3 , Pb(Fe 2/3 W 1/3 )O 3 and Pb(Zn 1/3 Nb 2/3 )O 3 which allows low-temperature sintering and has a high dielectric constant and a good dielectric constant temperature coefficient.
Inventors
- 👤 Masatomo Yonezawa
- 👤 Kazuaki Utsumi
- 👤 Tomeji Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:12
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A ceramic composition consisting essentially of [Pb(Fe 1/2 Nb 1/2 )O 3 ] x [Pb(Fe 2/3 W 1/3 )O 3 ] y [(Pb(Zn 1/3 Nb 2/3 )O 3 ] z wherein x+y+z=1.00 and the proportions x, y and z fall within the respective ranges of: 0.02≦x≦0.79, 0.20≦y≦0.50, and 0.01≦z≦0.48.
Claim 2
Dependent Claim
49 words
A ceramic composition consisting essentially of [Pb(Fe 1/2 Nb 1/2 )O 3 ] x [Pb(Fe 2/3 W 1/3 )O 3 ] y [(Pb(Zn 1/3 Nb 2/3 )O 3 ] z wherein x+y+z=1.00 and the proportions x, y and z fall within the respective ranges of: 0.02≦x≦0.79, 0.20≦y≦0.50, and 0.01≦z≦0.48.
Claim 3
Dependent Claim
24 words
A ceramic composition as claimed in claim 1, wherein the proportions x, y and z fall within the ranges of: 0.26≦x≦0.62 0.30≦y≦0.42, and 0.08≦z≦0.32.
Claim 4
Dependent Claim
29 words
A ceramic composition as claimed in claim 1, wherein the proportions of x, y and z fall within the ranges represented by the trapezoid EFGH in the accompanying drawing.
References Cited (Backward Citations)
US4078938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |