Patent US4223369A successfully refreshed from Google Patents.
US4223369A
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US
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Monolithic capacitor with low firing zirconate and nickel electrodes
Assignee: MRA Laboratories Inc
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Filing: 1978-07-03
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Granted: 1980-09-16
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Expires: 1998-07-03
Abstract
Abstract A monolithic ceramic capacitor having buried nickel electrodes is made by forming a paint of alkaline earth zirconates, a boron containing powder and an organic vehicle and binder. Nickel containing films are buried between dried and stacked layers of the paint. The stack is fired in a partial oxygen atmosphere at from 1200° C. to 1400° C. to produce a fully densified ceramic having a dielectric constant of greater than 30 and to provide a nickel electroded monolithic capacitor having a Q of greater than 1000 and a TCC of between ±30 ppm/°C. or better.
Inventors
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:08
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1236; H01G4/005; H01G4/008; H01G4/0085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
A monolithic ceramic capacitor comprising: a low-firing reduction-resistant zirconate body, said body having a full densification temperature of less than 1400° C., said body consisting essentially of from 90 to 99.85 percent by weight of a high firing phase selected from barium zirconate, strontium zirconate, calcium zirconate and combinations thereof, and from 0.15 to 10 percent by weight of a low melting boron phase; a nickel electrode being buried within said body; and another metal electrode contacting said body and being in capacitive relationship with said buried electrode.
Claim 2
Dependent Claim
88 words
A monolithic ceramic capacitor comprising: a low-firing reduction-resistant zirconate body, said body having a full densification temperature of less than 1400° C., said body consisting essentially of from 90 to 99.85 percent by weight of a high firing phase selected from barium zirconate, strontium zirconate, calcium zirconate and combinations thereof, and from 0.15 to 10 percent by weight of a low melting boron phase; a nickel electrode being buried within said body; and another metal electrode contacting said body and being in capacitive relationship with said buried electrode.
Claim 3
Dependent Claim
18 words
The capacitor of claim 1 wherein said boron phase is selected from boria and an alkaline earth borate.
Claim 4
Dependent Claim
27 words
The capacitor of claim 1 wherein said zirconate phase is a calcium-barium-zirconate wherein the atomic ratio of said barium to said calcium is from 0.065 to 0.09.
Claim 5
Dependent Claim
14 words
The capacitor of claim 2 wherein said borate is an alkaline earth alumino borate.
Claim 6
Dependent Claim
19 words
The capacitor of claim 4 wherein said borate is essentially 4BaO.Al 2 O 3 .2B 2 O 3 .
Claim 7
Dependent Claim
13 words
The capacitor of claim 2 wherein said borate is an alkaline earth borosilicate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |