Patent US4595580A successfully refreshed from Google Patents.
US4595580A
Expired / Lapsed
US
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Method for manufacturing fine powder of barium zirconate
Assignee: Sony Corp
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Filing: 1983-12-12
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Granted: 1986-06-17
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Expires: 2003-12-12
Abstract
Abstract A method of manufacturing fine powder of BaZrO 3 is described, in which a zirconium compound is first hydrolyzed. The hydrolyzed zirconium compound is then reacted with a water-soluble barium compound in a strongly alkaline solution having a pH not lower than 13.6.
Inventors
- 👤 Satoru Uedaira
- 👤 Masayuki Suzuki
- 👤 Hiroshi Yamanoi
- 👤 Hidemasa Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:00
CPC Classifications
C; C01; C01G; C01G25/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
A method of manufacturing fine powder of barium zirconate which comprises the steps of: hydrolyzing an inorganic zirconium compound to produce a hydrolysate; and reacting the hydrolysate thus produced with a water-soluble barium compound in an aqueous alkaline solution having a pH not lower than 13.6, and at a temperature not lower than 90° C., to produce said barium zirconate directly.
Claim 2
Independent Claim
61 words
A method of manufacturing fine powder of barium zirconate which comprises the steps of: hydrolyzing an inorganic zirconium compound to produce a hydrolysate; and reacting the hydrolysate thus produced with a water-soluble barium compound in an aqueous alkaline solution having a pH not lower than 13.6, and at a temperature not lower than 90° C., to produce said barium zirconate directly.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the pH is not lower than 13.7.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein the reaction between the hydrolyzed zirconium compound and the water-soluble barium compound is effected in a Ba-to-Zr molar ratio not smaller than 0.7:1.
Claim 5
Dependent Claim
16 words
A method according to claim 3, wherein the molar ratio is in the range of 0.9-10:1.
Claim 6
Dependent Claim
23 words
A method according to claim 1, wherein the temperature is in the range of 92° C. to a boiling point of reaction system.
Claim 7
Dependent Claim
48 words
A method according to claim 1, wherein said zirconium compound is a member selected from the group consisting of ZrCl 4 , ZrOCl 2 .8H 2 O, Zr(NO 3 ) 4 , ZrO(NO 3 ) 2 .2H 2 O, Zr(SO 4 ) 2 , and ZrOSO 4 .
Claim 8
Dependent Claim
48 words
A method according to claim 1, wherein said barium compound is a member selected from the group consisting of BaO, Ba(OH) 2 ,Ba(OH) 2 .8H 2 O, BaCl 2 , Ba(NO 3 ) 2 , Ba(CH 3 COO) 2 , and Ba(ClO 3 ) 2 .2H 2 O.
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) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |