US4584074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitors
Assignee: STC PLC
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Filing: 1985-01-30
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Granted: 1986-04-22
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Expires: 2005-01-30
Abstract
Abstract Ceramic capacitors are formed from electrodeposited ceramic dielectric layers that are provided with electrodes, stacked and fired. Contact to the electrodes is provided by each terminations and leads. As the electrodeposition process is self limiting and self heating, uniform pinhole free dielectric layers are obtained.
Inventors
- 👤 Henley F. Sterling
- 👤 Eric L. Bush
- 👤 John H. Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:40
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/02; H; H01; H01G; H01G13/00; H01G4/00; H01G4/30; H01G4/302; H01G4/308
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A process for fabricating a multi-layer ceramic capacitor comprising: electrodepositing a layer of a mixture of a ceramic powder and a resin material onto a conductive electrode to form a dielectric layer; performing at least twice a succession of steps to form a stack, including: depositing a permanent electrode material in a predetermined area on a surface of the dielectric layer said predetermined area being less than the entire surface of the dielectric layer; coating the remaining area on the surface with a temporary electrode material; electrodepositing a layer of a mixture of a ceramic powder and a resin material onto both the permanent electrode material and the temporary electrode material; heating the stack to convert the temporary electrode material to an insulating material, to remove the resin material and cure the ceramic dielectric layer.
Claim 2
Dependent Claim
135 words
A process for fabricating a multi-layer ceramic capacitor comprising: electrodepositing a layer of a mixture of a ceramic powder and a resin material onto a conductive electrode to form a dielectric layer; performing at least twice a succession of steps to form a stack, including: depositing a permanent electrode material in a predetermined area on a surface of the dielectric layer said predetermined area being less than the entire surface of the dielectric layer; coating the remaining area on the surface with a temporary electrode material; electrodepositing a layer of a mixture of a ceramic powder and a resin material onto both the permanent electrode material and the temporary electrode material; heating the stack to convert the temporary electrode material to an insulating material, to remove the resin material and cure the ceramic dielectric layer.
Claim 3
Dependent Claim
44 words
The process as claimed in claim 1 where the heating step is performed at a first temperature in the range of 300°-350° C. to remove the resin material and at a second temperature in the range of 900°-1500° C. to cure the ceramic layers.
Claim 4
Dependent Claim
14 words
The process as claimed in claim 1 wherein the depositing step includes screen printing.
Claim 5
Dependent Claim
14 words
The process as claimed in claim 1 wherein the depositing step includes electroless plating.
Claim 6
Dependent Claim
21 words
The process as claimed in claim 1 wherein the electrodeposition step includes forming the mixture from ceramic powder with perovskite structure.
Claim 7
Dependent Claim
18 words
The process as claimed in claim 1 wherein the coating step includes depositing nickel on the dielectric layer.
Claim 8
Dependent Claim
19 words
The process as claimed in claim 1 wherein the coating step includes depositing carbon as the temporary electrode material.
Claim 9
Dependent Claim
25 words
The process as claimed in claim 1 wherein the coating step includes depositing an electrically conductive form of titanium dioxide as the temporary electrode material.
Claim 10
Dependent Claim
23 words
The process as claimed in claim 1 wherein the electrodepositing step includes forming the mixture of ceramic powder which has a multi-phase structure.
Claim 11
Dependent Claim
21 words
The process as claimed in claim 1 wherein the electrodepositing step includes forming the resin material from a radiation sensitive material.
References Cited (Backward Citations)
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US2843541A
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US3093511A
Cited
US3232856A
Cited
US4189760A
Cited
US4225408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |