Patent US2346960A successfully refreshed from Google Patents.
Patent US4811164A successfully refreshed from Google Patents.
US4811164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic capacitor-varistor
Assignee: Nokia Bell Labs
•
Filing: 1988-03-28
•
Granted: 1989-03-07
•
Expires: 2008-03-28
Abstract
Abstract A multilayer protective device is made by including a varistor composition (35) between a first plurality of interdigitated electrodes (30, 32) and a capacitor composition (36) between a second plurality of electrodes of the same device. The two compositions are chosen to have optimum sintering temperatures within about 10 percent of each other. Simultaneous sintering solidifies and laminates the two compositions into a single monolithic device.
Inventors
- 👤 Hung C. Ling
- 👤 Man F. Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:37
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/40; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
145 words
A process for making a multilayer electronic device comprising the steps of forming an unsintered ceramic composition between a plurality of metal electrodes arranged as at least one first electrode interdigitated with at least two second electrodes, sintering the composition, and fixing a first terminal electrode to a first end of the first electrodes and a second terminal electrode to a second end of the second metal electrodes characterized in that the unsintered ceramic composition between at least one of the first electrodes and at least on e of the second electrodes is a capacitor composition; the unsintered ceramic composition between at least one first electrode and at least one second electrode is a varistor composition which is compositionally significantly different from the capacitor composition; and the varistor composition and the capacitor composition are sintered simultaneously, thereby to form a combined capacitor and varistor structure.
Claim 2
Dependent Claim
145 words
A process for making a multilayer electronic device comprising the steps of forming an unsintered ceramic composition between a plurality of metal electrodes arranged as at least one first electrode interdigitated with at least two second electrodes, sintering the composition, and fixing a first terminal electrode to a first end of the first electrodes and a second terminal electrode to a second end of the second metal electrodes characterized in that the unsintered ceramic composition between at least one of the first electrodes and at least on e of the second electrodes is a capacitor composition; the unsintered ceramic composition between at least one first electrode and at least one second electrode is a varistor composition which is compositionally significantly different from the capacitor composition; and the varistor composition and the capacitor composition are sintered simultaneously, thereby to form a combined capacitor and varistor structure.
Claim 3
Dependent Claim
22 words
The process of claim 1 further characterized in that the varistor composition consists of at least 97 mole percent of zinc oxide.
Claim 4
Dependent Claim
30 words
The process of claim 2 further characterized in that the varistor composition has an optimum sintering temperature within about ten percent of the optimum sintering temperature of the capacitor composition.
Claim 5
Dependent Claim
29 words
The process of claim 3 further characterized in that the varistor composition and the capacitor composition each has an optimum sintering temperature of between 950° C. and 1350° C.
Claim 6
Dependent Claim
40 words
The process of claim 4 further characterized in that the varistor composition is formed between one first electrode and two second electrodes and the capacitor composition is formed between a plurality of first electrodes and a plurality of second electrodes.
Claim 7
Dependent Claim
51 words
The process of claim 4 further characterized in that the varistor composition is formed as a plurality of layers, the capacitor composition is formed as a plurality of layers, the layers are stacked, and the metal electrodes are arranged such that there is one electrode between each contiguous pair of layers.
Claim 8
Dependent Claim
44 words
The process of claim 4 further characterized in that the varistor composition comprises zinc oxide containing at least one additive selected from the group consisting of Bi 2 O 3 , Sb 2 O 3 , CoO, MnO, and Cr 2 O 3 .
Claim 9
Dependent Claim
43 words
The process of claim 7 further characterized in that the capacitor composition is selected from the group consisting of BaTiO 3 , Pb(Mg 1/3 Nb 2/3 )O 3 , and Pb(Fe 1/2 Nb 1/2 )O 3 --Pb(Fe 2/3 W 1/3 )O 3 .
Claim 10
Dependent Claim
124 words
A multilayer device comprising layers of ceramic capacitor composition between a plurality of metal electrodes arranged as a plurality of first electrodes interdigitated with a plurality of second electrodes, a first terminal electrode connected to one end of the first metal electrodes and a second terminal electrode opposite the first terminal electrode connected to one end of the second metal electrodes characterized by a ceramic varistor composition of a significantly different material from that of the capacitor composition, the varistor composition being contained between at least one first electrode connected to the first terminal electrode and at least one second electrode connected to the second terminal electrode, whereby the first and second terminals are electrically coupled by a capacitor in parallel with a varistor.
Claim 11
Dependent Claim
124 words
A multilayer device comprising layers of ceramic capacitor composition between a plurality of metal electrodes arranged as a plurality of first electrodes interdigitated with a plurality of second electrodes, a first terminal electrode connected to one end of the first metal electrodes and a second terminal electrode opposite the first terminal electrode connected to one end of the second metal electrodes characterized by a ceramic varistor composition of a significantly different material from that of the capacitor composition, the varistor composition being contained between at least one first electrode connected to the first terminal electrode and at least one second electrode connected to the second terminal electrode, whereby the first and second terminals are electrically coupled by a capacitor in parallel with a varistor.
Claim 12
Dependent Claim
56 words
The device of claim 9 further characterized in that the ceramic varistor composition comprises predominantly zinc oxide and the capacitor composition is selected from the group consisting of BaTiO 3 , Pb(Mg 1/3 Nb 2/3 )O 3 and a solid solution of Pb(Fe 1/2 Nb 1/2 )O 3 and Pb(Fe 2/3 W 1/3 )O 3 .
Claim 13
Dependent Claim
37 words
The device of claim 10 further characterized in that the ceramic varistor composition has a non-linear exponent parameter α of between 4 and 50, and the ceramic capacitor composition has a dielectric constant in excess of 10,000.
Claim 14
Dependent Claim
51 words
The device of claim 9 further characterized in that the ceramic varistor composition and ceramic capacitor composition are made by including an unsintered varistor composition between certain first and second electrodes and an unsintered capacitor composition between the remaining first and second electrodes, and sintering the varistor and ceramic compositions simultaneously.
Claim 15
Dependent Claim
142 words
An electronic device made by a process comprising the steps of forming an unsintered ceramic composition between a plurality of metal electrodes arranged as at least one first electrode interdigitated with at least two second electrodes, sintering the composition, and fixing a first terminal electrode to a first end of the first electrodes and a second terminal electrode to a second end of the second metal electrodes characterized in that the unsintered ceramic composition between at least one of the first electrodes and at least one of the second electrodes is a capacitor composition; the unsintered ceramic composition between at least one first electrode and at least one second electrode is a varistor composition which is significantly different from the capacitor composition; and the varistor composition and the capacitor composition are sintered simultaneously, thereby to form a combined capacitor and varistor structure.
Claim 16
Dependent Claim
142 words
An electronic device made by a process comprising the steps of forming an unsintered ceramic composition between a plurality of metal electrodes arranged as at least one first electrode interdigitated with at least two second electrodes, sintering the composition, and fixing a first terminal electrode to a first end of the first electrodes and a second terminal electrode to a second end of the second metal electrodes characterized in that the unsintered ceramic composition between at least one of the first electrodes and at least one of the second electrodes is a capacitor composition; the unsintered ceramic composition between at least one first electrode and at least one second electrode is a varistor composition which is significantly different from the capacitor composition; and the varistor composition and the capacitor composition are sintered simultaneously, thereby to form a combined capacitor and varistor structure.
Claim 17
Dependent Claim
23 words
The electronic device of claim 13 further characterized in that the varistor composition consists of at least 97 mole percent of zinc oxide.
Claim 18
Dependent Claim
30 words
The electronic device of claim 14 further characterized in that varistor composition has an optimum sintering temperature within about ten percent of the optimum sintering temperature of the capacitor composition.
Claim 19
Dependent Claim
80 words
An electronic device comprising: a first terminal electrode comprising a plurality of parallel branches; a second electrode comprising a plurality of parallel branches; branches of the first electrode being interleaved with branches of the second electrode; a ceramic varistor composition being included between two or more first branches; a ceramic capacitor composition being included between two or more second branches; the second branches being different from the first branches; and the varistor composition being materially different from the capacitor composition.
Claim 20
Dependent Claim
80 words
An electronic device comprising: a first terminal electrode comprising a plurality of parallel branches; a second electrode comprising a plurality of parallel branches; branches of the first electrode being interleaved with branches of the second electrode; a ceramic varistor composition being included between two or more first branches; a ceramic capacitor composition being included between two or more second branches; the second branches being different from the first branches; and the varistor composition being materially different from the capacitor composition.
Claim 21
Dependent Claim
18 words
The electronic device of claim 16 wherein: the ceramic capacitor and the ceramic varistor compositions are sintered simultaneously.
Claim 22
Dependent Claim
49 words
The electronic device of claim 16 wherein: the varistor composition is formed as a plurality of layers; the capacitor composition is formed as a plurality of layers; the layers are stacked; and the electrode branches are arranged such that there is one branch between each contiguous pair of layers.
References Cited (Backward Citations)
US4041436A
Cited
US4097834A
Cited
US4296002A
Cited
US4320379A
Cited
US4541974A
Cited
US4400683A
Cited
US4461844A
Cited
JPH107201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |