US4612689A
Expired / Lapsed
US
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Method of manufacturing multilayer capacitors
Assignee: Phycomp Holding BV
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Filing: 1984-10-01
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Granted: 1986-09-23
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Expires: 2004-10-01
Abstract
Abstract A method of manufacturing multilayer ceramic capacitors characterized by the following steps: forming dielectric foils comprising a mixture of an organic binder with an oxidic ceramic powder; stacking these foils alternately with layers of electrically conductive material which function as electrodes; heating the stack to a previously determined temperature below the atmospheric pressure sintering temperature of the oxidic ceramic powder while simultaneously applying a uniaxial pressure in the direction of stacking to form a unit; releasing the pressure and cooling; and severing the unit into individual capacitor bodies.
Inventors
- 👤 Willem R. de Wild
- 👤 Gijsbertus de With
- 👤 Henricus C. Smulders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:28
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/30; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A method of manufacturing multilayer capacitors composed of alternate layers of a dielectric oxidic ceramic material and of an electrode material which have been formed into an integral body as a result of the application of pressure at an elevated temperature, characterized by the following steps: forming dielectric foils comprising a mixture of a organic binder with an oxidic ceramic powder; stacking said foils alternately with layers of electrically conductive material which function as electrodes; pressure-sintering the stack by heating the stack to a previously determined temperature below the atmospheric pressure sintering temperature of the oxidic ceramic powder while simultaneously applying a uniaxial pressure in the direction of stacking so as to form an integral body; releasing the pressure and cooling; and severing the unit into individual capacitor bodies.
Claim 2
Independent Claim
129 words
A method of manufacturing multilayer capacitors composed of alternate layers of a dielectric oxidic ceramic material and of an electrode material which have been formed into an integral body as a result of the application of pressure at an elevated temperature, characterized by the following steps: forming dielectric foils comprising a mixture of a organic binder with an oxidic ceramic powder; stacking said foils alternately with layers of electrically conductive material which function as electrodes; pressure-sintering the stack by heating the stack to a previously determined temperature below the atmospheric pressure sintering temperature of the oxidic ceramic powder while simultaneously applying a uniaxial pressure in the direction of stacking so as to form an integral body; releasing the pressure and cooling; and severing the unit into individual capacitor bodies.
Claim 3
Dependent Claim
33 words
A method as claimed in claim 1, characterized in that, prior to sintering, the stack is laminated at a temperature between 50° and 100° C. under a pressure between 0.5 and 5 kbar.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1, characterized in that the sintering temperature is between 900° C. and 1200° C.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 3, characterized in that, depending upon the sintering temperature, the uniaxial pressure is between 200 bar and 5 kbar.
Claim 6
Dependent Claim
31 words
A method as claimed in claim 1, characterized in that the largest dimension in the plane of the foils is at least ten times larger that the height of the stack.
Claim 7
Dependent Claim
25 words
A method as claimed in claim 1, characterized in the organic binder is fired from the mixture during the heating to the previously determined temperature.
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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |