Patent US3909327A successfully refreshed from Google Patents.
US3909327A
Expired / Lapsed
US
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Method for making a monolithic ceramic capacitor with silver bearing electrodes
Assignee: Individual
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Filing: 1974-08-05
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Granted: 1975-09-30
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Expires: 1994-08-05
Abstract
Abstract In a method for making a monolithic ceramic capacitor, electroding paste is applied to plates of green ceramic. The paste contains palladium or silver or alloys or mixtures thereof and a substantial quantity of ceramic particles. The plates are stacked and the stack is immersed in a zirconia sand containing silver, and is fired at a temperature that sinters the ceramic material and melts the electroding metal. When the electroding metal is palladium, the surrounding silver vapor at firing diffuses into the metal forming a silver alloy therewith. The electroding metal may be silver or mixtures or alloys containing silver. In all cases the silver vapor atmosphere prevents substantial escape of silver from the electrodes.
Inventors
- 👤 Maggio P Pechini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:36
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/30; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
AA METHOD FOR MAKING A MONOLITHIC CERAMIC CAPACITOR HAVING SILVER BEARING ELECTRODES COMPRISNG: A. DEPOSITING ON PLATES OF A GREEN CERAMIC MATERIAL A FILM OF CONDUCTIVE ELECTRODING PASTE, SAID PASTE COMPRISING PARTICLES THAT ARE BY WEIGHT 50-80% METAL AND 50-20% CERAMIC MATERIAL, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF PALLADIUM, SILVER, AND ALLOYS AND MIXTURES THEREOF, B. STACKING SAID PASTES, AND C. FIRING SAID STACK IN AN ATMOSPHERE CONTAINING SILVER VAPOR AT A SUFFICIENTLY HIGH TEMPERATURE TO SINTER SAID CERAMIC MATERIALS AND TO MELT SAID ELECTRODING METAL.
Claim 2
Dependent Claim
89 words
AA METHOD FOR MAKING A MONOLITHIC CERAMIC CAPACITOR HAVING SILVER BEARING ELECTRODES COMPRISNG: A. DEPOSITING ON PLATES OF A GREEN CERAMIC MATERIAL A FILM OF CONDUCTIVE ELECTRODING PASTE, SAID PASTE COMPRISING PARTICLES THAT ARE BY WEIGHT 50-80% METAL AND 50-20% CERAMIC MATERIAL, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF PALLADIUM, SILVER, AND ALLOYS AND MIXTURES THEREOF, B. STACKING SAID PASTES, AND C. FIRING SAID STACK IN AN ATMOSPHERE CONTAINING SILVER VAPOR AT A SUFFICIENTLY HIGH TEMPERATURE TO SINTER SAID CERAMIC MATERIALS AND TO MELT SAID ELECTRODING METAL.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said electroding metal is palladium, said silver vapor diffusing into said palladium during said firing and forming a molten silver palladium alloy.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said green ceramic material comprises barium titanate and bismuth stannate.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said firing is accomplished at a temperature from 1,800*C to 2,600*C.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein said silver vapor bearing environment at firing is produced by covering said stack with sand containing silver particles.
Claim 7
Dependent Claim
10 words
The method of claim 5 wherein said sand is zirconia.
Claim 8
Dependent Claim
19 words
The method of claim 5 wherein said silver loaded sand is comprised of about 3% silver and 97% zirconia.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |