US4052340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a voltage dependent resistor and a voltage dependent resistor obtained therewith
Assignee: US Philips Corp
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Filing: 1975-11-10
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Granted: 1977-10-04
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Expires: 1995-11-10
Abstract
Abstract Voltage dependent resistor obtained by sintering a body of a mixture of ZnO and other metal oxides in an atmosphere which contains bismuth.
Inventors
- 👤 Ronald Karel Eijnthoven
- 👤 Johannes Trudo Cornelis VAN Kemenade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:17
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: 4
Claim 1
Independent Claim
103 words
In a method for producing a voltage dependent resistor consisting mainly of a sintered body of zinc oxide and about 0.1-10% by weight of bismuth oxide in which, there is optionally present, small quantities of oxides of other metals and which body is provided, at opposite faces thereof, with ohmic electrodes, wherein the improvement comprises sintering a mixture of zinc oxide and oxides of metals which may be optionally present, at a temperature of between about 900° C - 1450° C, in an atmosphere containing bismuth oxide to produce a sintered body and then applying the ohmic electrodes to the resultant sintered body.
Claim 2
Dependent Claim
103 words
In a method for producing a voltage dependent resistor consisting mainly of a sintered body of zinc oxide and about 0.1-10% by weight of bismuth oxide in which, there is optionally present, small quantities of oxides of other metals and which body is provided, at opposite faces thereof, with ohmic electrodes, wherein the improvement comprises sintering a mixture of zinc oxide and oxides of metals which may be optionally present, at a temperature of between about 900° C - 1450° C, in an atmosphere containing bismuth oxide to produce a sintered body and then applying the ohmic electrodes to the resultant sintered body.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the atmosphere is an oxidizing atmosphere in contact with molten bismuth oxide.
Claim 4
Dependent Claim
9 words
A voltage dependent resistor obtained according to claim 1.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |