US4038217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramics having non-linear voltage characteristics and method of producing the same
Assignee: Fuji Electric Co Ltd
•
Filing: 1975-07-24
•
Granted: 1977-07-26
•
Expires: 1995-07-24
Abstract
Abstract A ceramic having non-linear voltage characteristics, comprising the product obtained on mixing (a) zinc oxide, as a principal component, and (b) (1) cobalt and (2) one of neodymium, samarium or dysprosium, either in an elemental form or as a compound thereof, each in an amount of 0.1 to 10 atomic % for the cobalt, neodymium, samarium and dysprosium, calculated as cobalt, neodymium, samarium and dysprosium as subcomponents, and calcining the mixture at a temperature of from about 1150° to about 1400° C.
Inventors
- 👤 Masaharu Namba
- 👤 Ikuo Nagasawa
- 👤 Kazuo Mukae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:34
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A ceramic having non-linear voltage characteristics consisting essentially of the calcined product obtained on calcining in air a mixture of (a) zinc oxide, as a principal component, and (b) (1) cobalt and (2) one of neodymium, samarium or dysprosium, either in an elemental form or as a compound thereof, each in an amount of 0.1 to 10 atomic % for the cobalt, neodymium, samarium and dysprosium, calculated as cobalt, neodymium, samarium, and dysprosium, respectively, as subcomponents.
Claim 2
Dependent Claim
76 words
A ceramic having non-linear voltage characteristics consisting essentially of the calcined product obtained on calcining in air a mixture of (a) zinc oxide, as a principal component, and (b) (1) cobalt and (2) one of neodymium, samarium or dysprosium, either in an elemental form or as a compound thereof, each in an amount of 0.1 to 10 atomic % for the cobalt, neodymium, samarium and dysprosium, calculated as cobalt, neodymium, samarium, and dysprosium, respectively, as subcomponents.
Claim 3
Dependent Claim
19 words
The ceramic of claim 1, wherein said ceramic consists essentially of zinc oxide, and oxides of cobalt and neodymium.
Claim 4
Dependent Claim
19 words
The ceramic of claim 1, wherein said ceramic consists essentially of zinc oxide, and oxides of cobalt and samarium.
Claim 5
Dependent Claim
19 words
The ceramic of claim 1, wherein said ceramic consists essentially of zinc oxide, and oxides of cobalt and dysprosium.
Claim 6
Independent Claim
88 words
A method for producing a ceramic having non-linear voltage characteristics consisting essentially of mixing (a) zinc oxide, as a principal component, and (b) (1) cobalt and (2) one of neodymium, samarium or dysprosium, either in an elemental form or as a compound thereof each in an amount of 0.1 to 10 atomic % for the cobalt, neodymium, samarium and dysprosium, respectively, calculated as cobalt, neodymium, samarium, and dysprosium, as subcomponents; and calcining the mixture in air at a temperature of from about 1150° C. to about 1400° C.
Claim 7
Independent Claim
88 words
A method for producing a ceramic having non-linear voltage characteristics consisting essentially of mixing (a) zinc oxide, as a principal component, and (b) (1) cobalt and (2) one of neodymium, samarium or dysprosium, either in an elemental form or as a compound thereof each in an amount of 0.1 to 10 atomic % for the cobalt, neodymium, samarium and dysprosium, respectively, calculated as cobalt, neodymium, samarium, and dysprosium, as subcomponents; and calcining the mixture in air at a temperature of from about 1150° C. to about 1400° C.
Claim 8
Dependent Claim
21 words
The method of preparing the ceramic of claim 5, wherein said calcining is in air at 1300° C. to 1350° C.
Claim 9
Dependent Claim
29 words
The method of preparing the ceramic of claim 5, wherein said mixture consists essentially of zinc oxide and cobalt and neodymium in elemental form or as a compound thereof.
Claim 10
Dependent Claim
29 words
The method of preparing the ceramic of claim 5, wherein said mixture consists essentially of zinc oxide and cobalt and samarium in elemental form or as a compound thereof.
Claim 11
Dependent Claim
29 words
The method of preparing the ceramic of claim 5, wherein said mixture consists essentially of zinc oxide and cobalt and dysprosium in elemental form or as a compound thereof.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |