Patent US4579702A successfully refreshed from Google Patents.
US4579702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc oxide voltage nonlinear resistors
Assignee: Fuji Electric Co Ltd
•
Filing: 1985-07-30
•
Granted: 1986-04-01
•
Expires: 2005-07-30
Abstract
Abstract A zinc oxide voltage-nonlinear resistor is described. The resistor is produced by sintering a zinc oxide mixture containing 0.08 to 5.0 atomic % of at least one rare earth element, 0.1 to 10.0 atomic % of cobalt, 0.01 to 1.0 atomic % of at least one member of potassium, cesium, and rubidium, 0.01 to 1.0 atomic % of chromium, and 5x10-4 to 1x10-1 atomic % of boron, the balance being zinc oxide. This resistor has superior voltage nonlinearity and is greatly improved in the short duration discharge current withstand capability and the life performance under application of electricity.
Inventors
- 👤 Satoshi Maruyama
- 👤 Koichi Tsuda
- 👤 Kazuo Mukae
- 👤 Ikuo Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:13
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A method for producing a zinc oxide voltage-nonlinear resistor, comprising the steps of: providing a mixture of components comprising 0.08 to 5.0 atomic % of a rare earth element, 0.1 to 10.0 atomic % of cobalt, 0.01 to 1.0 atomic % of an element selected from the group consisting of potassium, cesium, and rubidium, 0.01 to 1.0 atomic % of chromium, 5×10 -4 to 1×10 -1 atomic % of boron and the balance of the mixture being zinc oxide; and sintering the mixture to form a coherent mass.
Claim 2
Independent Claim
88 words
A method for producing a zinc oxide voltage-nonlinear resistor, comprising the steps of: providing a mixture of components comprising 0.08 to 5.0 atomic % of a rare earth element, 0.1 to 10.0 atomic % of cobalt, 0.01 to 1.0 atomic % of an element selected from the group consisting of potassium, cesium, and rubidium, 0.01 to 1.0 atomic % of chromium, 5×10 -4 to 1×10 -1 atomic % of boron and the balance of the mixture being zinc oxide; and sintering the mixture to form a coherent mass.
Claim 3
Dependent Claim
28 words
A method for producing a zinc oxide voltage-nonlinear resistor as claimed in claim 1, wherein the components of the mixture are provided in the form of metal oxides.
Claim 4
Dependent Claim
49 words
A method for producing a zinc oxide voltage-nonlinear resistor as claimed in claim 1, wherein the components of the mixture are provided in a form selected from the group consisting of carbonates, hydroxides, fluorides and solutions thereof which are capable of being converted into corresponding oxides during the sintering.
Claim 5
Independent Claim
142 words
A method for producing a zinc oxide voltage-nonlinear resistor, comprising the steps of: providing a mixture of components comprising 0.08 to 5.0 atomic % of a rare earth element, 0.1 to 10.0 atomic % of cobalt, 0.01 to 1.0 atomic % of an element selected from the group consisting of potassium, cesium, and rubidium, 0.01 to 1.0 atomic % of chromium, 5×10 -4 to 1×10 -1 atomic % of boron and the balance of the mixture being zinc oxide; thoroughly mixing the components; subjecting the components to preliminary calcining in air at a temperature in the range of 500° to 1000° C. to provide a preliminary calcined product; grinding the preliminarily calcined product to provide a powder; molding the powder into a predetermined form; and sintering the predetermined form in air at a temperature in the range of 1100° to 1400° C.
Claim 6
Independent Claim
142 words
A method for producing a zinc oxide voltage-nonlinear resistor, comprising the steps of: providing a mixture of components comprising 0.08 to 5.0 atomic % of a rare earth element, 0.1 to 10.0 atomic % of cobalt, 0.01 to 1.0 atomic % of an element selected from the group consisting of potassium, cesium, and rubidium, 0.01 to 1.0 atomic % of chromium, 5×10 -4 to 1×10 -1 atomic % of boron and the balance of the mixture being zinc oxide; thoroughly mixing the components; subjecting the components to preliminary calcining in air at a temperature in the range of 500° to 1000° C. to provide a preliminary calcined product; grinding the preliminarily calcined product to provide a powder; molding the powder into a predetermined form; and sintering the predetermined form in air at a temperature in the range of 1100° to 1400° C.
Claim 7
Dependent Claim
28 words
A method for producing a zinc oxide voltage-nonlinear resistor as claimed in claim 4, wherein the components of the mixture are provided in the form of metal oxides.
Claim 8
Dependent Claim
49 words
A method for producing a zinc oxide voltage-nonlinear resistor as claimed in claim 4, wherein the components of the mixture are provided in a form selected from the group consisting of carbonates, hydroxides, fluorides and solutions thereof which are capable of being converted into corresponding oxides during the sintering.
References Cited (Backward Citations)
US3663458A
Cited
US3928245A
Cited
US3903226A
Cited
US4028277A
Cited
US4046847A
Cited
US4386022A
Cited
US4320379A
Cited
US4477793A
Cited
US4473812A
Cited
JPS6152206A
Cited
JPS6152207A
Cited
JPS6152205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |