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US4533974A
Expired / Lapsed
US
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Low-firing high Q monolithic ceramic capacitor
Assignee: MRA Laboratories Inc
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Filing: 1984-04-09
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Granted: 1985-08-06
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Expires: 2004-04-09
Abstract
Abstract Monolithic ceramic capacitors exhibiting Q values of around 10,000 at 10 MHz have been made that sinter at 1100 DEG C. The buried electrodes are a 70 Ag/30 Pd alloy. The body has a high firing component and a low melting borate flux. The high firing component is a magnesium zinc titanate. The TCC of these capacitors is at least as low as 0+/-60 ppm.
Inventors
- 👤 Galeb H. Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:18
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A monolithic ceramic capacitor having a Q of at least 5000 at 1 MHz comprising a dense mature ceramic body and at least one sheet electrode buried in said body, said at least one electrode extending to one body face, said body having been co-fired with said buried electrode; said body being comprised of from 92-98 weight percent of a high firing ceramic composition and from 8-2 weight percent of a low firing borate flux, said high firing ceramic composition consisting essentially of 90 to 95 weight percent of a magnesium zinc titanate and 10 to 5 weight percent calcium titanate.
Claim 2
Dependent Claim
101 words
A monolithic ceramic capacitor having a Q of at least 5000 at 1 MHz comprising a dense mature ceramic body and at least one sheet electrode buried in said body, said at least one electrode extending to one body face, said body having been co-fired with said buried electrode; said body being comprised of from 92-98 weight percent of a high firing ceramic composition and from 8-2 weight percent of a low firing borate flux, said high firing ceramic composition consisting essentially of 90 to 95 weight percent of a magnesium zinc titanate and 10 to 5 weight percent calcium titanate.
Claim 3
Dependent Claim
19 words
The monolithic ceramic capacitor of claim 1 wherein said low firing borate flux amounts to from 5-2 weight percent.
Claim 4
Dependent Claim
36 words
The monolithic ceramic capacitor of claim 1 wherein said magnesium zinc titanate may have the molar formula Mg.sub.x Zn.sub.y TiO.sub.3 and wherein x ranges from 0.5 to 0.85 and wherein y ranges from 0.2 to 0.4.
Claim 5
Dependent Claim
34 words
The monolithic ceramic capacitor of claim 1 wherein said magnesium zinc titanate is Mg 2/3 Zn 1/3 TiO 3 and said CaTiO 3 contributes about 6.8% of the weight of said high firing ceramic.
Claim 6
Dependent Claim
38 words
The monolithic ceramic capacitor of claim 1 wherein said borate flux is selected from 5Cd:2SiO 2 , CdO:2ZnO:B 2 O 3 , 0.37ZnO:0.63B 2 O 3 , 3MgO:B 2 O 3 and 2MgO:ZnO: 3B 2 O 3 .
Claim 7
Dependent Claim
32 words
The monolithic ceramic capacitor of claim 1 wherein the total amount of B 2 O 3 in said body is from 1 to 3.5 mole percent of the number of titanium atoms.
Claim 8
Dependent Claim
21 words
The monolithic ceramic capacitor of claim 1 wherein the boron in said flux is at least twice the amount of silicon.
Claim 9
Dependent Claim
19 words
The monolithic ceramic capacitor of claim 1 wherein said buried electrode has a solidus temperature of about 1150° C.
References Cited (Backward Citations)
US4101952A
Cited
US4308570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |