Patent US4525767A successfully refreshed from Google Patents.
US4525767A
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US
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Ceramic capacitor and dielectric compositions
Assignee: STC PLC
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Filing: 1984-06-11
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Granted: 1985-06-25
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Expires: 2004-06-11
Abstract
Abstract A dielectric composition, for use in the manufacture of ceramic capacitors, and comprised of barium titanate (BaTiO 3 ) with small additions of niobium pentoxide (Nb 2 O 5 ) and gadolinium sesquioxide (Gd 2 O 3 ).
Inventors
- 👤 John H. Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; Y; Y10; Y10T; Y10T29/00; Y10T29/43
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
25 words
A capacitor dielectric composition comprising barium titanate (BaTiO 3 ), niobium pentoxide (Nb 2 O 5 ) and gadolinium sesquioxide (Gd 2 O 3 ).
Claim 2
Dependent Claim
25 words
A capacitor dielectric composition comprising barium titanate (BaTiO 3 ), niobium pentoxide (Nb 2 O 5 ) and gadolinium sesquioxide (Gd 2 O 3 ).
Claim 3
Dependent Claim
26 words
A capacitor dielectric composition as claimed in claim 1 comprising 97.9% by weight barium titanate, 1.1% by weight niobium pentoxide and 1% by weight gadolinium sesquioxide.
Claim 4
Dependent Claim
20 words
A capacitor dielectric composition as claimed in claim 1 wherein the constituents are in the proportion quoted in Table I.
Claim 5
Independent Claim
78 words
A method of manufacturing a ceramic capacitor including the steps of forming a disc-shaped or tubular-shaped ceramic body from a dielectric composition comprising barium titanate (BaTiO 3 ), niobium pentoxide (Nb 2 O 5 ) and gadolinium sesquioxide (Gd 2 O 3 ), firing the ceramic body, providing separate opposed surfaces of the ceramic body with a respective metal coating, connecting a respective connecting wire to each metal coating and encapsulating the ceramic body in an insulating material.
Claim 6
Independent Claim
78 words
A method of manufacturing a ceramic capacitor including the steps of forming a disc-shaped or tubular-shaped ceramic body from a dielectric composition comprising barium titanate (BaTiO 3 ), niobium pentoxide (Nb 2 O 5 ) and gadolinium sesquioxide (Gd 2 O 3 ), firing the ceramic body, providing separate opposed surfaces of the ceramic body with a respective metal coating, connecting a respective connecting wire to each metal coating and encapsulating the ceramic body in an insulating material.
Claim 7
Dependent Claim
35 words
A method of manufacturing a ceramic capacitor as claimed in claim 4, wherein the constituents of the dielectric comprise 97.9% by weight barium titanate, 1.1% by weight niobium pentoxide and 1% by weight gadolinium sesquioxide.
Claim 8
Dependent Claim
26 words
A method of manufacturing a ceramic capacitor as claimed in claim 4, wherein the constituents of the dielectric are in the proportions quoted in Table I.
Claim 9
Dependent Claim
66 words
A ceramic capacitor comprising a ceramic body formed from a fired dielectric composition comprising barium titanate (BaTiO 3 ), niobium pentoxide (Nb 2 O 5 ) and gadolinium sesquioxide (Gd 2 O 3 ), said ceramic body having opposed surfaces, a metal coating on each said surface, a connection terminal connected to each metal coating, and an encapsulating body of insulating material encapsulating the ceramic body.
Claim 10
Dependent Claim
66 words
A ceramic capacitor comprising a ceramic body formed from a fired dielectric composition comprising barium titanate (BaTiO 3 ), niobium pentoxide (Nb 2 O 5 ) and gadolinium sesquioxide (Gd 2 O 3 ), said ceramic body having opposed surfaces, a metal coating on each said surface, a connection terminal connected to each metal coating, and an encapsulating body of insulating material encapsulating the ceramic body.
Claim 11
Dependent Claim
32 words
A ceramic capacitor as claimed in claim 7, wherein the constituents of the dielectric composition comprise 97.9% by weight barium titanate, 1.1% by weight niobium pentoxide and 1% by weight gadolinium sesquioxide.
Claim 12
Dependent Claim
22 words
A ceramic capacitor as claimed in claim 7, wherein the constituents of the dielectric are in the proportions given in Table I.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |