US3683469A
Expired / Lapsed
US
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Method of fabricating multilayer ceramic capacitors
Assignee: Zenith Electronics LLC
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Filing: 1970-08-14
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Granted: 1972-08-15
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Expires: 1990-08-14
Abstract
Abstract A method of fabricating a multilayer capacitor comprising alternate layers of ceramic dielectric material and metal electrodes. Preformed unfired ceramic dielectric pills having major surfaces coated with metal electrodes of lesser area than the coated surfaces are stacked with alternate layers of unfired ceramic dielectric powder fill. The stack is subjected to pressure to form a unitary compacted and pre-electroded multilayer element of unfired ceramic dielectric material, and the multilayer element is then fired to ceramic maturity.
Inventors
- 👤 Raymond G Capek
- 👤 Frank T Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:18
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/30; Y; Y10; Y10S; Y10S29/00; Y10S29/031; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A method of fabricating a multilayer ceramic capacitor comprising: forming a plurality of preformed pills of unfired ceramic dielectric material by compressing unfired ceramic dielectric powder at a predetermined first pressure; coating at least one major surface of each said performed pill with a conductive electrode of smaller area than such major surface; stacking said pills with alternate layers of unfired ceramic dielectric fill in uncompressed powder form; compressing the stack at a second pressure higher than said predetermined first pressure to form a unitary compacted and pre-electroded multilayer element of unfired ceramic dielectric material; and firing said multilayer element to ceramic maturity.
Claim 2
Dependent Claim
20 words
A method according to claim 2, in which said predetermined first pressure is insufficient to fully compact said dielectric powder.
Claim 3
Dependent Claim
33 words
A method of fabricating a multilayer ceramic capacitor in accordance with claim 3, where the stack is compressed at a pressure at least twice said predetermined pressure used in forming said preformed pills.
Claim 4
Dependent Claim
54 words
A method of fabricating a multilayer ceramic capacitor in accordance with claim 2, in which said conductive electrodes are of substantially the same configuration as the major surfaces of said pills and in which the electrode coatings are applied to leave uncoated peripheral areas of approximately one-eighth inch in width on such major surfaces.
Claim 5
Dependent Claim
44 words
A method of fabricating a multilayer ceramic capacitor in accordance with claim 5, which includes the further step of bridging the uncoated peripheral areas of each electroded major surface with a narrow strip of inlaid conductive material to constitute terminal leads for said electrodes.
Claim 6
Independent Claim
110 words
A method of fabricating a multilayer ceramic capacitor which requires substantially less binder than heretofore required in making such capacitors, which method comprises: providing a pluralIty of preformed pills of unfired ceramic dielectric material containing only approximately 3 percent by weight of binder material with at least one major surface of each of said pills being coated with a conductive electrode of smaller area than such major surface; stacking said pills with alternate layers of unfired ceramic dielectric fill in uncompressed powder form; applying pressure to the stack to form a unitary compacted and pre-electroded multilayer element of unfired ceramic dielectric material; and firing said multilayer element to ceramic maturity.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |