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US3609482A
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Bismuth titanate film capacitor and method of manufacture
Assignee: GTE Sylvania Inc
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Filing: 1970-01-28
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Granted: 1971-09-28
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Expires: 1990-01-28
Abstract
Abstract Film capacitor of two conductive electrodes with an intervening dielectric layer of bismuth titanate and a glass binder. The capacitor is fabricated by depositing a base electrode of a goldpalladium alloy on an alumina substrate. A dielectric paste of a mixture of bismuth titanate, a lead-boro-silicate glass, and a resin solution is silk screened onto the base electrode, and then baked and fired. An upper electrode of silver is deposited on the bismuth titanate.
Inventors
- 👤 Frank H Edelman
- 👤 Simon Ernest Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:50
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/129; H01G4/1209; H01G4/1218
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
23 words
A capacitory in accordance with claim 1 wherein the glass binder constitutes between 2 1/2 and 10 percent by weight of the mixture.
Claim 2
Dependent Claim
64 words
A capacitor in accordance with claim 2 wherein one of the electrodes of said pair comprises material selected from the group consisting of gold, platinum, alloys of gold and palladium, and alloys of gold, platinum, and palladium; and the other electrode of said pair comprises material selected from the group consisting of silver, alloys of gold and palladium, and alloys of gold and platinum.
Claim 3
Dependent Claim
65 words
A capacitor in accordance with claim 3 wherein the glass binder consists essentially of from 55 to 80 percent by weight of lead oxide; from 10 to 17 percent by weight of boric oxide; from 10 to 25 percent by weight of silicon dioxide; from 0 to 5 percent by weight of aluminum oxide; and from 0 to 1 percent by weight of lithium oxide.
Claim 4
Dependent Claim
40 words
A capacitor in accordance with claim 4 wherein said one of the electrodes is composed of an alloy of gold and palladium and a glass binder; and said other of the electrodes is composed of silver and a glass binder.
Claim 5
Dependent Claim
87 words
A capacitor in accordance with claim 4 including a substrate of insulating material; and wherein said one of the electrodes of said pair is adherent to the substrate, said one of the electrodes being composed of an alloy of gold and palladium and a glass binder and being approximately 15 microns thick; said layer of dielectric material is between 20 and 35 microns thick; and said other of the electrodes of said pair is composed of silver and a glass binder and is approximately 15 microns thick.
Claim 6
Independent Claim
145 words
The method of producing a capacitor including the steps of forming one electrode of the capacitor of a conductive material; mixing together substantially pure bismuth trioxide and titanium dioxide in a ratio of 1 mol of bismuth trioxide to 2 mols of titanium dioxide; heating the mixture in an oxidizing atmosphere to react the materials and produce bismuth titanate; pulverizing the bismuth titanate so produced; mixing together the particles of bismuth titanate, the particles of a glass selected from the group consisting of lead-boro-silicate and modified lead-boro-silicate glasses, and a resin solution to form a paste for placing on the one electrode; screening the mixture in paste form onto the one electrode; heating the assembly to convert the mixture to a solid dielectric material; and depositing a layer of a conductive material on the dielectric materiaL to serve as the other electrode of the capacitor.
Claim 7
Dependent Claim
65 words
The method of producing a capacitor in accordance with claim 7 wherein the one electrode comprises a material selected from the group consisting of gold, platinum, alloys of gold and platinum, and alloys of gold, platinum, and palladium; and the layer of conductive material comprises a material selected from the group consisting of silver, alloys of gold and palladium, and alloys of gold and platinum.
Claim 8
Dependent Claim
81 words
The method of producing a capacitor in accordance with claim 7 wherein the glass constitutes between 2- 1/2 and 10 percent by weight of the mixture and consists essentially of from 55 to 80 percent by weight of lead oxide; from 10 to 17 percent by weight of boric oxide; from 10 to 25 percent by weight of silicon oxide; from 0 to 5 percent by weight of aluminum oxide; and from 0 to 1 percent by weight of lithium oxide.
Claim 9
Dependent Claim
126 words
The method of producing a capacitor in accordance with claim 11 wherein the mixture of bismuth trioxide and titanium dioxide is heated in an oxidizing atmosphere by raising the temperature of the mixture from room temperature to 1,050* C. over a period of 4 hours and is maintained at that temperature for a period of 1 hour; the bismuth titanate is pulverized to an average particle size of about 0.3 micron; and after screening the mixture in past form the assembly is heated at a temperature of 125* C. for approximately 10 minutes, heated to raise its temperature at a rate of about 40* C. per minute to a temperature of about 1,010* C, and maintained at a temperature of about 1,010* for approximately 10 minutes.
Claim 10
Dependent Claim
126 words
The method of producing a capacitor in accordance with claim 10 wherein the step of forming one electrode of the capacitor includes screening a paste containing gold, palladium, a glass binder, and an organic vehicle onto a surface of the substrate; and heating the assembly to burn off the organic vehicle and cause the gold, palladium, and the glass binder to adhere to the surface of the substrate; and wherein the step of depositing a layer of conductive material on the layer of dielectric material includes screening a paste containing silver, a glass binder, and an organic vehicle onto the layer of dielectric material; and heating the assembly to burn off the organic vehicle and cause the silver to adhere to the layer of dielectric material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |