US4304585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a thermal stress-resistant, rotary regenerator type ceramic heat exchanger
Assignee: NGK Insulators Ltd
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Filing: 1979-09-13
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Granted: 1981-12-08
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Expires: 1999-09-13
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 18:44
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
141 words
A method for producing a rotary regenerator type ceramic heat exchanger, which comprises extruding a plurality of ceramic honeycomb structural matrix segments from crystalline, particulate, ceramic-forming materials, each segment itself having a multiplicity of honeycomb openings therein, each segment further having opposed ends and an axis extending through said opposed ends in the direction of extrusion; firing the segments; bonding the segments side-by-side with one another so that the axes of the segments are substantially parallel 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 the difference in thermal expansion relative to the ceramic matrix segments being not greater than 0.1% at 800° C.; drying the bonded segments; and firing the dried bonded segments.
Claim 2
Independent Claim
141 words
A method for producing a rotary regenerator type ceramic heat exchanger, which comprises extruding a plurality of ceramic honeycomb structural matrix segments from crystalline, particulate, ceramic-forming materials, each segment itself having a multiplicity of honeycomb openings therein, each segment further having opposed ends and an axis extending through said opposed ends in the direction of extrusion; firing the segments; bonding the segments side-by-side with one another so that the axes of the segments are substantially parallel 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 the difference in thermal expansion relative to the ceramic matrix segments being not greater than 0.1% at 800° C.; drying the bonded segments; and firing the dried bonded segments.
Claim 3
Dependent Claim
12 words
A method as in claim 1 wherein the ceramic-forming material is codierite.
Claim 4
Dependent Claim
12 words
A method as in claim 1 wherein the ceramic-forming material is mullite.
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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |