US4357987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal stress-resistant, rotary regenerator type ceramic heat exchanger and method for producing same
Assignee: NGK Insulators Ltd
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Filing: 1981-07-27
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Granted: 1982-11-09
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Expires: 2001-07-27
Abstract
Abstract A thermal stress-resistant rotary regenerator type ceramic heat exchanger comprising a plurality of ceramic honeycomb structural matrix segments bonded by a ceramic binder is produced by extruding a plurality of ceramic honeycomb structural matrix segments, firing the segments, bonding the segments with one another by application of a ceramic binder, said ceramic binder after the subsequent sintering having substantially the same mineral composition as said ceramic matrix segments and the thickness of 0.1 to 6 mm, and a difference in thermal expansion being not greater than 0.1% at 800° C. relative to the ceramic matrix segments, drying the bonded segments, and firing the dried bonded segments.
Inventors
- 👤 Isao Oda
- 👤 Tadaaki Matsuhisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:17
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F28D19/042; F28F; F28F21/00; F28F21/04; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/042; Y10S165/043; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
A rotary regenerator type ceramic heat exchanger comprising a plurality of ceramic honeycomb structural matrix segments bonded by a ceramic binder, said ceramic binder after the subsequent sintering having substantially the same mineral composition as said ceramic matrix segments and the thickness of 0.1 to 6 mm, and a difference in thermal expansion being not greater than 0.1% at 800° C. relative to the ceramic matrix segments.
Claim 2
Dependent Claim
67 words
A rotary regenerator type ceramic heat exchanger comprising a plurality of ceramic honeycomb structural matrix segments bonded by a ceramic binder, said ceramic binder after the subsequent sintering having substantially the same mineral composition as said ceramic matrix segments and the thickness of 0.1 to 6 mm, and a difference in thermal expansion being not greater than 0.1% at 800° C. relative to the ceramic matrix segments.
Claim 3
Independent Claim
93 words
A method for producing a rotary regenerator type ceramic heat exchanger, which comprises extruding a plurality of ceramic honeycomb structural matrix segments; firing the segments; bonding the segments with one another by application of a ceramic binder, said ceramic binder after the subsequent sintering having substantially the same mineral composition as said ceramic matrix segments and the thickness of 0.1 to 6 mm, and a difference in thermal expansion being not greater than 0.1% at 800° C. relative to the ceramic matrix segments; drying the bonded segments; and firing the dried bonded segments.
Claim 4
Independent Claim
93 words
A method for producing a rotary regenerator type ceramic heat exchanger, which comprises extruding a plurality of ceramic honeycomb structural matrix segments; firing the segments; bonding the segments with one another by application of a ceramic binder, said ceramic binder after the subsequent sintering having substantially the same mineral composition as said ceramic matrix segments and the thickness of 0.1 to 6 mm, and a difference in thermal expansion being not greater than 0.1% at 800° C. relative to the ceramic matrix segments; drying the bonded segments; and firing the dried bonded segments.
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |