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Patent US4103274A successfully refreshed from Google Patents.
US4103274A
Expired / Lapsed
US
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Reconstituted metal oxide varistor
Assignee: General Electric Co
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Filing: 1976-09-13
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Granted: 1978-07-25
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Expires: 1996-09-13
Abstract
Abstract Reconstituted metal oxide varistors are formed by hot pressing powdered metal oxide varistor ceramic with plastic resin. Metal electrodes may be pressed directly into the ceramic-plastic composite to provide improved contact characteristics.
Inventors
- 👤 James F. Burgess
- 👤 Roland T. Girard
- 👤 Francois D. Martzloff
- 👤 Constantine A. Neugebauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:06
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; Y10T29/49101
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
19 words
A reconstituted metal oxide varistor comprising a composite of metal oxide varistor ceramic particles in a plastic resin matrix.
Claim 2
Dependent Claim
19 words
A reconstituted metal oxide varistor comprising a composite of metal oxide varistor ceramic particles in a plastic resin matrix.
Claim 3
Dependent Claim
17 words
The varistor of claim 1 wherein adjacent ceramic particles in said composite are in intimate physical contact.
Claim 4
Dependent Claim
26 words
The varistor of claim 1 wherein said composite comprises a quantity of thermoplastic resin which is at least sufficient to fill voids between said ceramic particles.
Claim 5
Dependent Claim
24 words
The varistor of claim 1 wherein the metal oxide varistor ceramic comprises a sintered mixture of zinc oxide, bismuth oxide, and other metal oxides.
Claim 6
Dependent Claim
11 words
The varistor of claim 1 wherein the resin comprises polycarbonate plastic.
Claim 7
Dependent Claim
17 words
The varistor of claim 1 further comprising at least one metal electrode in contact with said composite.
Claim 8
Dependent Claim
22 words
The varistor of claim 6 wherein said electrodes comprise metal sheet members in contact with at least one surface of said composite.
Claim 9
Dependent Claim
11 words
The varistor of claim 7 wherein said metal sheets comprise copper.
Claim 10
Dependent Claim
11 words
The varistor of claim 7 wherein said metal sheets comprise aluminum.
Claim 11
Dependent Claim
13 words
The varistor of claim 6 wherein adjacent ceramic particles penetrate said metal electrodes.
Claim 12
Dependent Claim
19 words
The varistor of claim 6 wherein said electrodes comprise conductive metal paste applied to the surface of said composite.
Claim 13
Dependent Claim
15 words
The varistor of claim 6 comprising two electrodes on the faces of said varistor body.
Claim 14
Independent Claim
41 words
A method for forming a reconstituted metal oxide varistor comprising the steps of: forming a powder from particles of a metal oxide varistor ceramic; mixing said powder with a plastic resin; and pressing said mixture to form a solid composite body.
Claim 15
Independent Claim
41 words
A method for forming a reconstituted metal oxide varistor comprising the steps of: forming a powder from particles of a metal oxide varistor ceramic; mixing said powder with a plastic resin; and pressing said mixture to form a solid composite body.
Claim 16
Dependent Claim
32 words
The method of claim 13 wherein the ratio of ceramic powder to plastic resin in said mixture is sufficient to allow intimate physical contact between adjacent ceramic particles in said composite body.
Claim 17
Dependent Claim
22 words
The method of claim 13 wherein said mixture contains sufficient plastic resin to fill voids between ceramic particles in said composite body.
Claim 18
Dependent Claim
11 words
The method of claim 13 wherein said plastic resin comprises polycarbonate.
Claim 19
Dependent Claim
21 words
The method of claim 13 wherein said varistor ceramic comprises a mixture of zinc oxide, bismuth oxide, and other metal oxides.
Claim 20
Dependent Claim
17 words
The method of claim 13 wherein said plastic resin is mixed with said ceramic in powdered form.
Claim 21
Dependent Claim
22 words
The method of claim 13 wherein said pressing is accomplished at a pressure below approximately 2 × 10 3 kg/cm 2 .
Claim 22
Dependent Claim
17 words
The method of claim 13 wherein said pressing is accomplished at a temperature of approximately 220° C.
Claim 23
Dependent Claim
24 words
The method of claim 13 wherein said metal oxide varistor ceramic powder has a particle size between approximately 44 microns and approximately 200 microns.
Claim 24
Dependent Claim
17 words
The method of claim 13 further comprising the step of pressing metal electrodes into said solid body.
Claim 25
Dependent Claim
11 words
The method of claim 22 wherein said metal electrodes comprise copper.
Claim 26
Dependent Claim
11 words
The method of claim 22 wherein said metal electrodes comprise aluminum.
Claim 27
Dependent Claim
31 words
The method of claim 22 wherein said metal electrodes are metal sheets and said pressing step comprises hot pressing said metal sheets into at least one surface of said solid body.
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) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |