US4764493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of mono-size powders of barium titanate
Assignee: Corning Glass Works
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Filing: 1986-06-16
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Granted: 1988-08-16
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Expires: 2006-06-16
Abstract
Abstract Mono-sized barium titanate powders which have high density and substantially pure stoichiometry are provided. The powders can be produced by reacting barium hydroxide with titanium dioxide in a protic solvent at a temperature of at least 100° C. for a period of at least 48 hours, or by reacting barium hydroxide with a titanium alkoxide in a protic solvent at a temperature of about the boiling point of the alkyl alcohol corresponding to the alkoxide for a period of at least about 240 hours.
Inventors
- 👤 Edward Lilley
- 👤 Raja R. Wusirika
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:22
CPC Classifications
C; C01; C01G; C01G23/00; B; B82; B82Y; B82Y30/00; C01G23/003; C01G23/006; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/10; C01P2006/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
A method of producing BaTiO 3 powders comprising reacting barium hydroxide with titania having a particle size not greater than 0.1 micron, said reaction being conducted in a protic solvent at a temperature of at least 100° C. for a period of at least 48 hours to produce BaTiO 3 having a density of at least 5.7 g/cc.
Claim 2
Independent Claim
58 words
A method of producing BaTiO 3 powders comprising reacting barium hydroxide with titania having a particle size not greater than 0.1 micron, said reaction being conducted in a protic solvent at a temperature of at least 100° C. for a period of at least 48 hours to produce BaTiO 3 having a density of at least 5.7 g/cc.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the protic solvent is water.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein the titania is at least 75% by weight anatase titania.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein the reaction temperature is 100°-125° C.
Claim 6
Independent Claim
56 words
A method of producing BaTiO 3 powder comprising reacting barium hydroxide with a titanium alkoxide in a protic solvent at a temperature of about the normal boiling temperature of the alcohol corresponding to the alkoxide for a period of at least about 240 hours to produce BaTiO 3 having a density of at least 5.7 g/cc.
Claim 7
Independent Claim
56 words
A method of producing BaTiO 3 powder comprising reacting barium hydroxide with a titanium alkoxide in a protic solvent at a temperature of about the normal boiling temperature of the alcohol corresponding to the alkoxide for a period of at least about 240 hours to produce BaTiO 3 having a density of at least 5.7 g/cc.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein the protic solvent is water or isopropyl alcohol.
Claim 9
Dependent Claim
14 words
The method of claim 5 wherein the alkoxide is titanium isopropoxide or titanium ethoxide.
Claim 10
Dependent Claim
24 words
The method of claim 6 wherein the alkoxide is titanium isopropoxide and wherein the reaction is conducted at a temperature of about 80°-82° C.
References Cited (Backward Citations)
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US4534956A
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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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |