Patent US4419971A successfully refreshed from Google Patents.
US4419971A
Expired / Lapsed
US
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Cylinder liner for an internal combustion engine
Assignee: Toshiba Corp
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Filing: 1982-11-23
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Granted: 1983-12-13
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Expires: 2002-11-23
Abstract
Abstract A cylinder liner for use in an internal combustion engine which is formed of ceramic material having a density higher than 95% of theoretical value and a randomly directed and homogeneous structure. The ceramic liner is composed of silicon nitride, silicon carbide, an oxynitride such as silicon oxynitride and silicon aluminum oxynitride, silicon nitride-silicon carbide or aluminum nitride.
Inventors
- 👤 Kiyoshi Nakamura
- 👤 Katsutoshi Nishida
- 👤 Toshihiko Ochiai
- 👤 Akio Ando
- 👤 Syoji Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:02
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0085; F02F7/0087; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/597; F02F1/00; F02F1/18; F05; F05C; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/083; F05C2203/0843; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A free standing cylinder liner for use in an internal combustion engine comprising: a sintered homogeneous ceramic mass of molded material having a density higher than 95% of theoretical density value of the material, a flexural strength greater than 50 kg/cm 2 at 800° C. and a randomly directed, homogeneous structure, wherein said material comprises a powdered raw material selected from the group consisting of silicon nitride, aluminum nitride, silicon oxynitride and silicon aluminum oxynitride which has been sintered in a furnace free from application of pressure thereon, wherein said sintered ceramic mass at least comprises silicon nitride.
Claim 2
Dependent Claim
98 words
A free standing cylinder liner for use in an internal combustion engine comprising: a sintered homogeneous ceramic mass of molded material having a density higher than 95% of theoretical density value of the material, a flexural strength greater than 50 kg/cm 2 at 800° C. and a randomly directed, homogeneous structure, wherein said material comprises a powdered raw material selected from the group consisting of silicon nitride, aluminum nitride, silicon oxynitride and silicon aluminum oxynitride which has been sintered in a furnace free from application of pressure thereon, wherein said sintered ceramic mass at least comprises silicon nitride.
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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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |