Patent US4254070A successfully refreshed from Google Patents.
US4254070A
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Process for producing sintered body of ceramic composition for voltage non-linear resistor
Assignee: TDK Corp
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Filing: 1979-10-30
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Granted: 1981-03-03
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Expires: 1999-10-30
Abstract
Abstract A sintered body of a ceramic composition for voltage non-linear resistor is produced by sintering an oxide semiconductor composition comprising a main component of zinc oxide and a minor component at 1100° to 1400° C.; then maintaining the sintered body in an inert gas such as N 2 , Ar and so on having an oxygen content of 0.1 to 21 vol. % at the temperature lower than the sintering temperature for a specific time; changing the atmosphere into an inert gas having an oxygen content of lower than 0.02 vol. % at 800° to 1200° C.; and cooling it.
Inventors
- 👤 Masatada Yodogawa
- 👤 Matsuo Morisawa
- 👤 Takashi Yamamoto
- 👤 Katsunobu Okutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:52
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112; C; C04; C04B; C04B35/00; C04B35/01; C04B35/453; C04B35/622; C04B35/64; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A process for producing a sintered body of a ceramic composition for voltage non-linear resistor which comprises sintering an oxide semiconductor composition comprising a main component of zinc oxide and a minor component of another meter oxide at 1100° to 1400° C.; then soaking the sintered body in an inert gas having an oxygen content of 0.1 to 21 vol.% for a specific time; changing the atmosphere into an inert gas having an oxygen content of lower than 0.02 vol.% at 800° to 1200° C.; and cooling it.
Claim 2
Dependent Claim
88 words
A process for producing a sintered body of a ceramic composition for voltage non-linear resistor which comprises sintering an oxide semiconductor composition comprising a main component of zinc oxide and a minor component of another meter oxide at 1100° to 1400° C.; then soaking the sintered body in an inert gas having an oxygen content of 0.1 to 21 vol.% for a specific time; changing the atmosphere into an inert gas having an oxygen content of lower than 0.02 vol.% at 800° to 1200° C.; and cooling it.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein said oxide semiconductor composition comprises more than 70 mole % of ZnO.
Claim 4
Dependent Claim
16 words
A process according to claim 1 wherein said oxide semiconductor composition comprises a transition metal component.
Claim 5
Dependent Claim
17 words
A process according to claim 3 wherein said oxide semiconductor composition comprises a rare earth metal component.
Claim 6
Dependent Claim
17 words
A process according to claim 3 wherein said oxide semiconductor composition comprises an alkaline earth metal component.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the oxygen content in the inert gas in ranging from 0.5 to 10 vol.%.
Claim 8
Dependent Claim
25 words
A process according to claim 3 wherein the content of the transition metal component is ranging from 0.1 to 20 mole % as MO(M=transition metal).
Claim 9
Dependent Claim
31 words
A process according to claim 4 wherein the content of the rare earth metal component is ranging from 0.01 to 5 mole % as R 2 O 3 (R=rare earth metal).
Claim 10
Dependent Claim
27 words
A process according to claim 5 wherein the content of the alkaline earth metal component is ranging from 0.1 to 5 mole % as M'O(M'=alkaline earth metal).
Claim 11
Dependent Claim
17 words
A process according to claim 1 wherein the soaking is carried out in two or more steps.
References Cited (Backward Citations)
US3000828A
Cited
US3585261A
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US3953371A
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US3903226A
Cited
US4094061A
Cited
US4142996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |