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Patent US4014968A successfully refreshed from Google Patents.
US4014968A
Expired / Lapsed
US
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Shrinkage control of cellular ceramic bodies having axial cavities
Assignee: Corning Glass Works
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Filing: 1974-07-19
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Granted: 1977-03-29
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Expires: 1994-07-19
Abstract
Abstract Method of reducing the firing shrinkage of the axial hub opening in a disc-type cellular or honeycomb, ceramic heat exchanger by substantially filling the hub opening with a plug which undergoes substantially the same firing shrinkage as the hub opening. The plug then shrinks with the heat exchanger and keeps the hub opening closed, thereby preventing accelerated heating of the cellular ceramic nearest the hub opening and corresponding local increase in the firing shrinkage due to the accelerated heating. A plug with a bulk density closely approximating that of the ceramic matrix is desirable and a plug fashioned from the same cellular ceramic material as the matrix is particularly convenient and effective.
Inventors
- 👤 Raphael A. Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:54
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/26; B23P11/00; B23P11/02; F; F27; F27D; F27D5/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49357; Y10T29/49826; Y10T29/49863; Y10T29/49865; Y10T428/00; Y10T428/21; Y10T428/218; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A method of controlling the firing shrinkage and delamination in the inner half of a disc-type, honeycomb ceramic matrix having a plurality of unobstructed gas passages extending therethrough substantially parallel to the central axis of the matrix and defined by alternate layers of flat and corrugated ceramic sheets wrapped around an axial hub cavity extending therethrough, the improvement comprising firing the honeycomb ceramic matrix with a temporary plug which substantially fills the hub cavity and which undergoes substantially the same radial shrinkage as the honeycomb ceramic matrix during the firing cycle and removing the plug from the hub cavity after completion of the firing cycle.
Claim 2
Independent Claim
105 words
A method of controlling the firing shrinkage and delamination in the inner half of a disc-type, honeycomb ceramic matrix having a plurality of unobstructed gas passages extending therethrough substantially parallel to the central axis of the matrix and defined by alternate layers of flat and corrugated ceramic sheets wrapped around an axial hub cavity extending therethrough, the improvement comprising firing the honeycomb ceramic matrix with a temporary plug which substantially fills the hub cavity and which undergoes substantially the same radial shrinkage as the honeycomb ceramic matrix during the firing cycle and removing the plug from the hub cavity after completion of the firing cycle.
Claim 3
Dependent Claim
41 words
The method of claim 1 wherein the plug comprises an unfired honeycomb ceramic having substantially the same composition as the honeycomb ceramic matrix and having a plurality of unobstructed cells extending therethrough substantially parallel to the central axis of the matrix.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the plug has a bulk density which is substantially the same as the bulk density of the matrix.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |