US3647364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high-purity submicron barium and strontium titanate powders
Assignee: United States Department of the Air Force
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Filing: 1970-01-06
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Granted: 1972-03-07
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Expires: 1990-01-06
Abstract
Abstract Barium titanate and strontium titanate powders having a particle size in the range of 50 to 150 angstroms and a purity of 99.75 percent or higher are prepared by the hydrolytic decomposition of a barium or strontium alcoholate and a titanium alcoholate. The barium and strontium titanate powders are useful in the preparation of dense ferroelectric bodies, thin film electronic components, and piezoelectric materials.
Inventors
- 👤 Khodabakhsh S Mazdiyasni
- 👤 Richard T Dolloff
- 👤 Jonathan S Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:08
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47; C01; C01G; C01G23/00; C01G23/003; C01G23/006; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/76; C01P2002/80; C01P2002/82; C01P2004/00; C01P2004/51; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A process according to claim 1 in which said compound is barium bis isopropoxide and barium titanate is recovered from said drying step.
Claim 2
Dependent Claim
23 words
A process according to claim 1 in which said compound is strontium bis isopropoxide and strontium titanate is recovered from said drying step.
Claim 3
Dependent Claim
22 words
A process according to claim 1 in which said solution is refluxed for a period of from about 1 to 5 hours.
Claim 4
Dependent Claim
17 words
A process according to claim 1 in which said solvent is an alcohol or an aromatic hydrocarbon.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |