Patent US4397773A successfully refreshed from Google Patents.
US4397773A
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Varistor with tetragonal antimony zinc oxide additive
Assignee: General Electric Co
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Filing: 1980-09-26
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Granted: 1983-08-09
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Expires: 2000-09-26
Abstract
Abstract A low varistor voltage, low leakage metal oxide varistor and especially a zinc oxide varistor is provided by adding a few percent of tetragonal antimony zinc oxide to the varistor mixture prior to sintering. A method for manufacturing the additive as well as a method for manufacturing a varistor including the additive are described.
Inventors
- 👤 John E. May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:54
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
An additive for reducing the varistor voltage and the leakage current of zinc oxide varistors consisting of particulate tetragonal-antimony-zinc-oxide of the form ZnSb 2 O 4 .
Claim 2
Dependent Claim
27 words
An additive for reducing the varistor voltage and the leakage current of zinc oxide varistors consisting of particulate tetragonal-antimony-zinc-oxide of the form ZnSb 2 O 4 .
Claim 3
Dependent Claim
20 words
The additive of claim 1 wherein said particulate antimony zinc oxide has a particle size less than about 50 microns.
Claim 4
Dependent Claim
22 words
The additive of claim 1 wherein said particulate antimony zinc oxide has a particle size between about 5 and about 20 microns.
Claim 5
Independent Claim
80 words
A method for making a metal oxide varistor having low voltage and low leakage comprising combining zinc oxide as a major constituent, bismuth oxide and one or more other metal oxides as minor constituents, and a varistor voltage-reducing additive of less than 10 weight percent of particulate tetragonal ZnSb 2 O 4 having a particle size of less than about 50 microns; pressing said combination to form a body; and sintering said body at a temperature of about 1300° C.
Claim 6
Independent Claim
80 words
A method for making a metal oxide varistor having low voltage and low leakage comprising combining zinc oxide as a major constituent, bismuth oxide and one or more other metal oxides as minor constituents, and a varistor voltage-reducing additive of less than 10 weight percent of particulate tetragonal ZnSb 2 O 4 having a particle size of less than about 50 microns; pressing said combination to form a body; and sintering said body at a temperature of about 1300° C.
Claim 7
Dependent Claim
50 words
A metal oxide varistor having low varistor voltage and low leakage comprising zinc oxide as a major constituent, bismuth oxide and at least one other metal oxide as minor constituents, and a varistor voltage-reducing additive of from 0.1 to 10% by weight of particulate tetragonal ZnSb 2 O 4 .
Claim 8
Dependent Claim
50 words
A metal oxide varistor having low varistor voltage and low leakage comprising zinc oxide as a major constituent, bismuth oxide and at least one other metal oxide as minor constituents, and a varistor voltage-reducing additive of from 0.1 to 10% by weight of particulate tetragonal ZnSb 2 O 4 .
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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |