Patent US3996502A successfully refreshed from Google Patents.
US3996502A
Expired / Lapsed
US
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Thick film capacitors
Assignee: Zenith Electronics LLC
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Filing: 1975-06-02
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Granted: 1976-12-07
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Expires: 1995-06-02
Abstract
Abstract An alumina substrate thick film circuit includes capacitors sealed with two intermediate layers of non-conductive material and two layers of sealing glass. The temperature coefficient of expansion of the sealing glass is less than that of the substrate. The temperature coefficient of expansion of the intermediate layer material is intermediate those of the substrate and the sealing glass, or equal to that of the sealing glass.
Inventors
- 👤 William R. Bratschun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:56
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/162; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H05K1/02; H05K1/03; H05K1/0306; H05K1/09; H05K1/092; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/09654; H05K2201/09763; H05K3/00; H05K3/22; H05K3/28; H05K3/46; H05K3/4644; H05K3/4664; H05K3/4667
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A multi-layered thick film circuit deposited on a non-conductive substrate, which has a first temperature coefficient of expansion, forming a capacitor comprising: a first layer of conductive material; a second layer of dielectric material; a third layer of conductive material; a fourth layer of insulating material having a second temperature coefficient of expansion; a fifth layer overlying said fourth layer and extending beyond said other layers into contact with said substrate for sealing said circuit and having a third temperature coefficient of expansion equal to or less than said first temperature coefficient and less than said second temperature coefficient; and means making electrical connection to said first and third conductive layers.
Claim 2
Dependent Claim
111 words
A multi-layered thick film circuit deposited on a non-conductive substrate, which has a first temperature coefficient of expansion, forming a capacitor comprising: a first layer of conductive material; a second layer of dielectric material; a third layer of conductive material; a fourth layer of insulating material having a second temperature coefficient of expansion; a fifth layer overlying said fourth layer and extending beyond said other layers into contact with said substrate for sealing said circuit and having a third temperature coefficient of expansion equal to or less than said first temperature coefficient and less than said second temperature coefficient; and means making electrical connection to said first and third conductive layers.
Claim 3
Dependent Claim
23 words
A thick film circuit as set forth in claim 1 wherein said second layer is a mixture of barium titanate and glass particles.
Claim 4
Dependent Claim
26 words
A thick film circuit as set forth in claim 2 wherein said fourth layer comprises an insulating mixture of high temperature glass and aluminum oxide powder.
Claim 5
Dependent Claim
30 words
A thick film circuit as set forth in claim 3 wherein said fourth layer comprises two separate applications of said insulating mixture, each of which are fired with the substrate.
Claim 6
Dependent Claim
25 words
A thick film circuit as set forth in claim 4 wherein said fifth layer comprises two separate coatings of sealing glass fired with the substrate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |