US3760244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic capacitor and method of forming same
Assignee: Illinois Tool Works Inc
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Filing: 1972-08-31
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Granted: 1973-09-18
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Expires: 1992-08-31
Abstract
Abstract A ceramic capacitor is disclosed herein having ceramic layers formed of a composition of lead oxide, aluminum oxide, silicon oxide, barium oxide, and calcium oxide. Deposited on the ceramic layers are silver electrodes and the entire ceramic capacitor including the electrodes are fired at a temperature below 961*C which is below the melting temperature of the silver electrodes.
Inventors
- 👤 Clelland R Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
42 words
A monolithic ceramic capacitor in accordance with claim 1, which includes a plurality of layers of said ceramic body with said electrode material deposited thereon, alternate electrode layers being offset from one another to extend to opposite edges of the monolithic body.
Claim 2
Dependent Claim
13 words
A ceramic capacitor according to claim 1, wherein said electrode material is silver.
Claim 3
Dependent Claim
69 words
The ceramic capacitor according to claim 1, wherein said lead oxide is in an amount of 32.4 percent by weight, said aluminum oxide is in an amount of 1.2 percent by weight, said silicon oxide is in an amount of 43.2 percent by weight, said barium oxide is in an amount of 3.9 percent by weight, and said calcium oxide is in an amount of 19.3 percent by weight.
Claim 4
Dependent Claim
23 words
The ceramic capacitor according to claim 1, further including barium titanate in an amount of about from 0 to 13 percent by weight.
Claim 5
Dependent Claim
20 words
The ceramic capacitor according to claim 5, wherein said barium titanate is in an amount of 6.8 percent by weight.
Claim 6
Dependent Claim
23 words
The ceramic capacitor according to claim 1, further including titanium oxide in an amount of about from 0 to 36 percent by weight.
Claim 7
Dependent Claim
20 words
The ceramic capacitor according to claim 7, wherein said titanium oxide is in an amount of 20 percent by weight.
Claim 8
Dependent Claim
22 words
The ceramic capacitor according to claim 1, further including calcium titanate in an amount of about 0 to 15 percent by weight.
Claim 9
Dependent Claim
20 words
The ceramic capacitor according to claim 9, wherein said calcium titanate is in an amount of 12 percent by weight.
Claim 10
Dependent Claim
21 words
The ceramic capacitor according to claim 1, further including SrTiO3 in an amount of about 0 to 25 percent by weight.
Claim 11
Dependent Claim
19 words
The ceramic capacitor according to claim 11, wherein said SrTiO3 is in an amount of 12 percent by weight.
Claim 12
Dependent Claim
19 words
The ceramic capacitor according to claim 11, wherein said SrTiO3 is in an amount of 20 percent by weight.
Claim 13
Independent Claim
129 words
A method of forming a low-loss monolithic multilayer ceramic capacitor comprising the steps of: forming a green ceramic body of a mixture of materials including lead oxide in an amount of about from 15 to 40 percent by weight, aluminum oxide in an amount of about from 0.3 to 2 percent by weight, silicon oxide in an amount of about from 10 to 60 percent by weight, barium oxide in an amount of about from 1 to 5 percent by weight, calcium oxide in an amount of about from 2% to 20% by weight, applying silver electrodes to said green ceramic body, stacking a plurality of said ceramic bodies and firing said ceramic bodies and said silver electrodes at a temperature below the melting point of said silver electrodes.
Claim 14
Dependent Claim
25 words
A method of forming a ceramic capacitor according to claim 14, wherein said firing is conducted at a temperature of from about 891*C to 961*C.
Claim 15
Dependent Claim
73 words
The method of forming a ceramic capacitor according to claim 14, wherein said lead oxide is in an amount of 32.4 percent by weight, said aluminUm oxide is in an amount of 1.2 percent by weight, said silicon oxide is in an amount of 43.2 percent by weight, said barium oxide is in an amount of 3.9 percent by weight, and said calcium oxide is in an amount of 19.3 percent by weight.
Claim 16
Dependent Claim
31 words
The method of forming a ceramic capacitor according to claim 14, further including the step of adding barium titanate in an amount of about from 0 to 13 percent by weight.
Claim 17
Dependent Claim
31 words
The method of forming a ceramic capacitor according to claim 14, further including the step of adding titanium oxide in an amount of about from 0 to 36 percent by weight.
Claim 18
Dependent Claim
31 words
The method of forming a ceramic capacitor according to claim 14, further including the step of adding calcium titanate in an amount of about from 0 to 15 percent by weight.
Claim 19
Dependent Claim
30 words
The method of forming a ceramic capacitor according to claim 14, further including adding a composition of CaZrO3 in an amount of about from 0 to 6 percent by weight.
Claim 20
Dependent Claim
28 words
The method of forming a ceramic capacitor according to claim 14, further including adding a composition of SrTiO3 in an amount of about from 0 to 25 percent.
Claim 21
Dependent Claim
23 words
The method of forming a ceramic capacitor according to claim 21, wherein said SrTiO3 is in an amount of 12 percent by weight.
Claim 22
Dependent Claim
23 words
The method of forming a ceramic capacitor according to claim 21, wherein said SrTiO3 is in an amount of 20 percent by weight.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |