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US4191665A
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Barium titanate semiconductor ceramic compositions
Assignee: Murata Manufacturing Co Ltd
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Filing: 1978-09-13
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Granted: 1980-03-04
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Expires: 1998-09-13
Abstract
Abstract A barium titanate semiconductor ceramic composition which consists essentially of a basic component of barium titanate wherein 5 to 20 mol% of Ba is replaced with Ca, and contains 0.30 to 0.90 mol% of Ho and 0.10 to 0.18 mol% of Mn. The composition enables to produce semiconductor devices with a positive temperature characteristic and a high breakdown voltage, such as PTC thermistors.
Inventors
- 👤 Harufumi Mandai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; H01C7/023; H01C7/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
The barium titanate semiconductor ceramic composition consisting essentially of the composition expressed by the general formula: (Ba.sub.l-x-y-z Ca.sub.x Ho.sub.y Mn.sub.z)TiO.sub.3 wherein x, y and z are respective mol fractions and have values in the following respective ranges: 0.05≦x≦0.20 0.0030≦y≦0.0090 0.0010≦z≦0.0018.
Claim 2
Dependent Claim
40 words
The barium titanate semiconductor ceramic composition consisting essentially of the composition expressed by the general formula: (Ba.sub.l-x-y-z Ca.sub.x Ho.sub.y Mn.sub.z)TiO.sub.3 wherein x, y and z are respective mol fractions and have values in the following respective ranges: 0.05≦x≦0.20 0.0030≦y≦0.0090 0.0010≦z≦0.0018.
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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |