US4677083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing dielectric fine powder of Ba1-x Srx TiO3
Assignee: Sony Corp
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Filing: 1985-01-22
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Granted: 1987-06-30
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Expires: 2005-01-22
Abstract
Abstract A method for manufacturing dielectric titanate fine powder having the formula Ba 1-x Sr x TiO 3 wherein 0<x<1 is disclosed, which includes the steps of preparing a hydrolysis product of an inorganic titanium compound TiO 2 .xH 2 O by dissolving the inorganic titanium compound in a neutral or alkaline aqueous solution, reacting the hydrolysis product with a water soluble salt of Ba and a water soluble salt of Sr in an aqueous alkaline solution having a pH no less than 13.0 to thereby obtain the dielectric fine powder having the formula Ba 1-x Sr x TiO 3 wherein 0<x<1, and filtering the fine powder from the remaining solution.
Inventors
- 👤 Satoru Uedaira
- 👤 Hiroshi Yamanoi
- 👤 Takashi Yamaguchi
- 👤 Masayuki Suzuki
- 👤 Hidemasa Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; B; B82; B82Y; B82Y30/00; C; C01; C01G; C01G23/00; C01G23/003; C01G23/006; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2002/70; C01P2002/72; C01P2002/76; C01P2002/77; C01P2004/00; C01P2004/01; C01P2004/04; C01P2004/60; C01P2004/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A method for manufacturing dielectric titanate fine powder having the formula Ba 1-x Sr x TiO 3 wherein 0<x<1 comprising the steps of: p1 preparing a hydrolysis product of an inorganic titanium compound, said hydrolysis product being a hydrate of TiO 2 by dissolving said inorganic titanium compound in a neutral or alkaline aqueous solution, reacting said hydrolysis product with a water soluble salt of Ba and a water soluble salt of Sr in an aqueous alkaline solution having a pH not less than 13.0 to thereby obtain said dielectric fine powder having the formula Ba 1-x Sr x TiO 3 wherein 0<x<1; and filtering said fine powder from the remaining solution.
Claim 2
Independent Claim
112 words
A method for manufacturing dielectric titanate fine powder having the formula Ba 1-x Sr x TiO 3 wherein 0<x<1 comprising the steps of: p1 preparing a hydrolysis product of an inorganic titanium compound, said hydrolysis product being a hydrate of TiO 2 by dissolving said inorganic titanium compound in a neutral or alkaline aqueous solution, reacting said hydrolysis product with a water soluble salt of Ba and a water soluble salt of Sr in an aqueous alkaline solution having a pH not less than 13.0 to thereby obtain said dielectric fine powder having the formula Ba 1-x Sr x TiO 3 wherein 0<x<1; and filtering said fine powder from the remaining solution.
Claim 3
Dependent Claim
27 words
A method for manufacturing dielectric titanate fine powder according to claim 1, in which a molar ratio of (Ba+Sr)/Ti is in the range from 0.5 to 5.0.
Claim 4
Dependent Claim
32 words
A method for manufacturing dielectric titanate fine powder according to claim 1, in which the reaction temperature is in the range from 15° C. to the boiling point of the reaction mixture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |