US4489774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary cordierite heat regenerator highly gas-tight and method of producing the same
Assignee: NGK Insulators Ltd
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Filing: 1983-10-11
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Granted: 1984-12-25
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Expires: 2003-10-11
Abstract
Abstract Highly gas-tight rotary cordierite heat regenerator is formed of a honeycomb structural body having a porosity of 20-45% and mainly consisting of cordierite, and open pores of the partition walls defining channels of the honeycomb structural body are sealed with a filler thereto, the difference of thermal expansion between the honeycomb structural body and the filler being less than 0.1% at 800° C. The honeycomb structural body is made by preparing fired segments thereof, sealing the open pores of the partition walls with the filler thereof, bonding the segments with a ceramic bonding material, and firing the bonded segments.
Inventors
- 👤 Yutaka Ogawa
- 👤 Shunichi Yamada
- 👤 Toshiyuki Hamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:12
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F28D19/042; F28F; F28F21/00; F28F21/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249957
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A rotary cordierite heat regenerator with a high gastightness, comprising a honeycomb structural body with a porosity of 20-45%, said honeycomb structural body mainly consisting of cordierite, open pores of partition walls of said honeycomb structural body defining channels thereof being sealed with filler substances applied thereto, the difference of thermal expansion between the honeycomb structural body and the filler substances being less than 0.1% at 800° C.
Claim 2
Dependent Claim
68 words
A rotary cordierite heat regenerator with a high gastightness, comprising a honeycomb structural body with a porosity of 20-45%, said honeycomb structural body mainly consisting of cordierite, open pores of partition walls of said honeycomb structural body defining channels thereof being sealed with filler substances applied thereto, the difference of thermal expansion between the honeycomb structural body and the filler substances being less than 0.1% at 800° C.
Claim 3
Dependent Claim
22 words
A rotary cordierite heat regnerators as set forth in claim 1, wherein the filler substances mainly consist of cordierite and glass substance.
Claim 4
Dependent Claim
26 words
A rotary cordierite heat regenerator as set forth in claim 2, wherein the filler substances mainly consist of 5-30% of cordierite and 3-25% of glass substance.
Claim 5
Dependent Claim
26 words
A rotary cordierite heat regenerator as set forth in claim 2, wherein the filler substances mainly consist of 10-20% of cordierite and 5-15% of glass substance.
Claim 6
Dependent Claim
24 words
A rotary cordierite heat regenerator as set forth in claim 1, wherein said honeycomb structural body is made of a plurality of matrix segments.
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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |