Patent US4098725A successfully refreshed from Google Patents.
US4098725A
Expired / Lapsed
US
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Low thermal expansive, electroconductive composite ceramics
Assignee: TDK Corp
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Filing: 1975-11-21
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Granted: 1978-07-04
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Expires: 1995-11-21
Abstract
Abstract Low thermally expansive, electroconductive composite sintered ceramics comprised of a phase of at least one ceramics selected from the group consisting of low thermally expansive ceramics and negatively thermally expansive ceramics, having dispersed thereinto substantially in a continuous state a phase of an electroconductive substance such as a metal.
Inventors
- 👤 Hirotaka Yamamoto
- 👤 Hideaki Ninomiya
- 👤 Makoto Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/478; C04B35/16; C04B35/18; C04B35/19; C04B35/195; C04B35/71; H; H01; H01B; H01B1/00; H01B1/14; H01B3/00; H01B3/002; H01B3/004; H01C; H01C7/00; H01C7/02; H01C7/022; H01C7/04; H01C7/042; H01C7/043; H05; H05B; H05B3/00; H05B3/10; H05B3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A low thermally expansive, electroconductive composite sintered ceramic comprising a phase of at least one ceramic selected from the group consisting of (a) low thermally expansive ceramics selected from the group consisting of spodumene series ceramics, eucryptite series ceramics, aluminium titanate series ceramics, cordierite series ceramics, mullite series ceramics and zircon series ceramics having a thermal expansion coefficient of about 5 × 10 -6 /degree or less and (b) negatively thermally expansive ceramics selected from the group consisting of eucryptite series ceramics and aluminium titanate ceramics and said sintered ceramic having dispersed therein at least 10% by volume of a phase of NiFe 2 O 4 substantially in a continuous state.
Claim 2
Dependent Claim
111 words
A low thermally expansive, electroconductive composite sintered ceramic comprising a phase of at least one ceramic selected from the group consisting of (a) low thermally expansive ceramics selected from the group consisting of spodumene series ceramics, eucryptite series ceramics, aluminium titanate series ceramics, cordierite series ceramics, mullite series ceramics and zircon series ceramics having a thermal expansion coefficient of about 5 × 10 -6 /degree or less and (b) negatively thermally expansive ceramics selected from the group consisting of eucryptite series ceramics and aluminium titanate ceramics and said sintered ceramic having dispersed therein at least 10% by volume of a phase of NiFe 2 O 4 substantially in a continuous state.
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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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |