US5312684A
Expired / Lapsed
US
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Threshold switching device
Assignee: Dow Silicones Corp
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Filing: 1991-05-02
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Granted: 1994-05-17
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Expires: 2011-05-02
Abstract
Abstract This invention relates to a method of forming a threshold switching device which exhibits negative differential resistance and to the devices formed thereby. The method comprises depositing a silicon dioxide film derived from hydrogen silsesquioxane resin between at least two electrodes and then applying a voltage above a threshold voltage across the electrodes.
Inventors
- 👤 Keith W. Michael
- 👤 Udo C. Pernisz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:48
CPC Classifications
H; H10; H10N; H10N70/00; H10N70/011; H10N70/021; H01; H01H; H01H1/00; H01H1/02; G; G06; G06N; G06N3/00; G06N3/02; G06N3/06; G06N3/063; H10B; H10B63/00; H10B63/80; H10B63/82; H10N70/20; H10N70/801; H10N70/821; H10N70/826; H10N70/881; H10N70/883; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
A threshold switching device comprising: at least 2 leads making contacts at separate points on a material comprising silica with a density between about 0.9 and about 2.1 g/cc derived from hydrogen silsesquioxane, wherein said leads are separated by said material.
Claim 2
Dependent Claim
41 words
A threshold switching device comprising: at least 2 leads making contacts at separate points on a material comprising silica with a density between about 0.9 and about 2.1 g/cc derived from hydrogen silsesquioxane, wherein said leads are separated by said material.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein the leads are separated by a distance of less than about 5000 nm.
Claim 4
Dependent Claim
12 words
The device of claim 1 wherein the device is in nonoxidizing atmosphere.
Claim 5
Dependent Claim
28 words
The device of claim 1 wherein the leads are made of a material selected from the group consisting of gold, aluminum, silver, copper, platinum, gallium arsenide, and silicon.
Claim 6
Dependent Claim
18 words
The device of claim 1 wherein the silica material is between about 50 and about 5000 nm thick.
Claim 7
Dependent Claim
41 words
The device of claim 1 wherein the material also comprises one or more modifying ceramic oxides present in an amount such that the material contains 0.1 to 30 percent by weight modifying ceramic oxide based on the total weight of material.
Claim 8
Dependent Claim
32 words
The device of claim 6 wherein the modifying ceramic oxide comprises an oxide of one or more elements selected from the group consisting of iron, titanium, zirconium, aluminum, tantalum, vanadium, and niobium.
Claim 9
Dependent Claim
30 words
The device of claim 1 wherein the leads are placed in an arrangement selected from the group consisting of coplanar, transplanar, crossed grid arrays and 2 dimensional circular dot patterns.
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) | 1997-05-16 | 1997-11-15 | 1998-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-16 | 2001-11-15 | 2002-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-16 | 2005-11-15 | 2006-05-17 | $7700.00 | Window Closed / Lapsed |