Patent US4441094A successfully refreshed from Google Patents.
US4441094A
Expired / Lapsed
US
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Solderable largely base metal electrodes for metal oxide varistors
Assignee: Littelfuse Inc
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Filing: 1981-03-02
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Granted: 1984-04-03
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Expires: 2001-03-02
Abstract
Abstract Solderable, largely based metal electrodes for metal oxide varistors are fabricated by screen printing an electrically conductive, air-fireable base metal composition on a varistor material substrate. A distributed fine noble metal array is screen printed over the screened base metal and the varistor heated in air at a temperature of between approximately 500° C. and 800° C. The varistor leads are easily solderable to the noble metal array.
Inventors
- 👤 Lionel M. Levinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:53
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/28; H01C17/281; H01C17/283; H01C17/285; H01C7/00; H01C7/10; H01C7/102; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A metal oxide varistor having electrodes attached to at least one major surface thereof, comprising: at least one base metal electrode bonded to said metal oxide varistor and forming therewith an electrically conductive contact; and a distributed noble metal pattern disposed on said base metal electrode and forming an electrically conductive contact with said base metal electrode, said noble metal pattern covering a selected fraction of said base metal electrode whereby is formed a multi-layered low resistivity contact.
Claim 2
Dependent Claim
78 words
A metal oxide varistor having electrodes attached to at least one major surface thereof, comprising: at least one base metal electrode bonded to said metal oxide varistor and forming therewith an electrically conductive contact; and a distributed noble metal pattern disposed on said base metal electrode and forming an electrically conductive contact with said base metal electrode, said noble metal pattern covering a selected fraction of said base metal electrode whereby is formed a multi-layered low resistivity contact.
Claim 3
Dependent Claim
27 words
The metal oxide varistor of claim 1 wherein said base metal electrode comprises at least one material selected from the group consisting of nickel, aluminum, and chromium.
Claim 4
Dependent Claim
28 words
The metal oxide varistor of claim 2 wherein said noble metal pattern comprises at least one material selected from the group consisting of silver, platinum, palladium, and gold.
Claim 5
Dependent Claim
23 words
The metal oxide varistor of claim 1 wherein said noble metal pattern comprises a grid formed by intersecting strips of said noble metal.
Claim 6
Dependent Claim
20 words
The metal oxide varistor of claim 1 wherein said noble metal pattern comprises a plurality of discrete noble metal regions.
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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |