US4451516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low thermal expansion ceramic article
Assignee: NGK Insulators Ltd
•
Filing: 1981-08-31
•
Granted: 1984-05-29
•
Expires: 2001-08-31
Abstract
Abstract A low thermal expansion ceramic article having a thermal expansion coefficient of not higher than 2.5×10 -6 /°C. within the temperature range of 40°-800° C., and comprising a plural number of ceramic parts bonded into a monolithic structure through glass-ceramics consisting mainly of 10-20% of MgO, 20-40% of Al 2 O 3 , 40-60% of SiO 2 , 0.1-3% of BaO and 0.01-1% of ZrO 2 , is excellent in the heat resistance and in the thermal shock resistance, and can be advantageously used as a rotary regenerator type heat exchanger and a recuperative heat exchanger for gas turbine engine, stirling engine, and industrial apparatuses; and a rotor for turbocharger.
Inventors
- 👤 Kiminari Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:37
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B37/00; C04B37/003; C04B37/005; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165; Y10T428/24174; Y10T428/24942; Y10T428/2495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A low thermal expansion ceramic article having a thermal expansion coefficient of not higher than 2.5×10 -6 /°C. within the temperature range of 40°-800° C., comprising cell structured ceramic parts consisting of thin walls bonded to bulk-structured parts having a large thickness through glass-ceramics consisting essentially of 10-20% by weight of MgO, 22.3-40% by weight of A 12 O 3 , 40-60% by weight of SiO 2 , 0.1-3% by weight of BaO, 0.01-1% by weight of ZrO 2 and not more than 10% by weight of impurities.
Claim 2
Dependent Claim
88 words
A low thermal expansion ceramic article having a thermal expansion coefficient of not higher than 2.5×10 -6 /°C. within the temperature range of 40°-800° C., comprising cell structured ceramic parts consisting of thin walls bonded to bulk-structured parts having a large thickness through glass-ceramics consisting essentially of 10-20% by weight of MgO, 22.3-40% by weight of A 12 O 3 , 40-60% by weight of SiO 2 , 0.1-3% by weight of BaO, 0.01-1% by weight of ZrO 2 and not more than 10% by weight of impurities.
References Cited (Backward Citations)
US3849097A
Cited
GB1456456A
Cited
US4063955A
Cited
US4142879A
Cited
JPS5441409A
Cited
US4225354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |