Patent US5236632A successfully refreshed from Google Patents.
US5236632A
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Zinc oxide sintered body, and preparation process and use thereof
Assignee: Tosoh Corp
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Filing: 1992-03-02
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Granted: 1993-08-17
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Expires: 2012-03-02
Abstract
Abstract An electroconductive zinc oxide sintered body composed of sintered particles fusion-bonded in the grain boundaries thereof; which has a sintered density of from 5 to 5.5 g/cm 3 ; and which does not substantially contain closed cells isolated from the outside in the interior of the sintered body. The electroconductive zinc oxide sintered body is prepared by sintering a mixture of an oxide of an element having a positive valency of at least 3 and zinc oxide in the presence of water at a temperature of at least 1,300° C. The electroconductive zinc oxide sintered body is used as a sputtering target for the preparation of a low resistance, transparent electroconductive film.
Inventors
- 👤 Nobuhiro Ogawa
- 👤 Takashi Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:05
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/453; C23; C23C; C23C14/00; C23C14/22; C23C14/34; C23C14/3407; C23C14/3414; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
186 words
A process for the preparation of an electroconductive zinc oxide sintered body, which comprises the steps of: mixing powdery zinc oxide and a powdery hydrate of at least one oxide of an element having a positive valency of at least 3, and sintering the mixture at a temperature of at least 1,300° C.; said element being selected from the group consisting of Sc and Y of groups IIIB of the Periodic Table, B, Al, Ga, In and Tl of the group IIIA, Ti, Zr, Hf and Th of the group IVB, C, Si, Ge, Sn and Pb of the group IVA, V, Nb, Ta and Pa of the group VB, As, Sb and Bi of the group VA, Cr, Mo, W and U of the group VIB, Se, Te and Po of the group VIA, Mn, Tc and Re of the group VIIB, Fe, Co, Ni, Ru, Rh, Pd, OS, Ir and Pt of the group VIII, lanthanide elements, and actinide elements, and the amount of said element being from 0.1 to 20 atomic % based on the amount of the zinc of the zinc oxide.
Claim 2
Dependent Claim
186 words
A process for the preparation of an electroconductive zinc oxide sintered body, which comprises the steps of: mixing powdery zinc oxide and a powdery hydrate of at least one oxide of an element having a positive valency of at least 3, and sintering the mixture at a temperature of at least 1,300° C.; said element being selected from the group consisting of Sc and Y of groups IIIB of the Periodic Table, B, Al, Ga, In and Tl of the group IIIA, Ti, Zr, Hf and Th of the group IVB, C, Si, Ge, Sn and Pb of the group IVA, V, Nb, Ta and Pa of the group VB, As, Sb and Bi of the group VA, Cr, Mo, W and U of the group VIB, Se, Te and Po of the group VIA, Mn, Tc and Re of the group VIIB, Fe, Co, Ni, Ru, Rh, Pd, OS, Ir and Pt of the group VIII, lanthanide elements, and actinide elements, and the amount of said element being from 0.1 to 20 atomic % based on the amount of the zinc of the zinc oxide.
Claim 3
Dependent Claim
38 words
The process according to claim 1, wherein the amount of the element having a positive valency of at least 3 is from 0.5 to 5 atomic % based on the amount of the zinc of the zinc oxide.
Claim 4
Dependent Claim
40 words
The process according to claim 1, wherein the mixture of the oxide of the element having a positive valency of at least 3 and the zinc oxide is first molded, and the resulting molded mixture is then subjected to sintering.
Claim 5
Dependent Claim
28 words
The process according to claim 1, wherein the sintering is carried out at a temperature of from 1,400° C. to 1,500° C. for from 5 to 20 hours.
Claim 6
Dependent Claim
22 words
The process according to claim 1, wherein the sintering is carried out at a temperature of from 1,450° C. to 1,500° C.
References Cited (Backward Citations)
US3538023A
Cited
US4142996A
Cited
US4767729A
Cited
US4948529A
Cited
US5102650A
Cited
US5026672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |