Patent US4209334A successfully refreshed from Google Patents.
US4209334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous ceramic seals and method of making same
Assignee: Technetics Corp
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Filing: 1977-12-12
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Granted: 1980-06-24
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Expires: 1997-12-12
Abstract
Abstract A ceramic-metal composite laminate capable of exposure to high temperature differentials without damage, consisting of an inner ceramic layer, an outer metal layer and an intermediate interface layer of a low modulus metallic low density structure having a high melting point. The ceramic layer is secured to the low modulus structure directly or through an intermediate ceramic-metal composite, and the outer metal layer is brazed to the intermediate low modulus layer. Thermal strains caused by a temperature differential between the inner and outer layers are taken up without harmful effect by the intermediate low modulus layer.
Inventors
- 👤 Carlino Panzera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:16
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; B; B32; B32B; B32B15/00; B32B15/02; B32B7/00; B32B7/04; C04B30/00; C04B30/02; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/123; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/38; C04B2237/40; C04B2237/405; C04B2237/50; C04B2237/59; C04B2237/592; C04B2237/60; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/937; Y10S277/943; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A ceramic material made of a particle mixture of a first material having a composition of 35-55 percent SiO 2 +45-55 percent Al 2 O 3 and up to 2 percent a second material having a composition of borosilicate glass, each of the particles of the components having a size range up to 80 microns, wherein upon sintering the first and second component materials, free quartz is released and the material forms a structure having mullite fibers surrounded by a matrix of said glass containing dissolved quartz, the material usable in a high temperature range from about 1800° F. to 3000° F. depending upon the erosion and loading environments.
Claim 2
Dependent Claim
109 words
A ceramic material made of a particle mixture of a first material having a composition of 35-55 percent SiO 2 +45-55 percent Al 2 O 3 and up to 2 percent a second material having a composition of borosilicate glass, each of the particles of the components having a size range up to 80 microns, wherein upon sintering the first and second component materials, free quartz is released and the material forms a structure having mullite fibers surrounded by a matrix of said glass containing dissolved quartz, the material usable in a high temperature range from about 1800° F. to 3000° F. depending upon the erosion and loading environments.
Claim 3
Dependent Claim
97 words
A mixture of mullite (3Al 2 O 3 .2SiO 2 ) fibers and a low expansion reactive glass, having one of the following compositions 80.5 SiO 2 --12.9 B 2 O 3 --3.8 Na 2 O--2.2 Al 2 O 3 --0.4 K 2 O, or 67.0 SiO 2 --27.4 BaO--5.6 Al 2 O 3 (all in weight percent); the mixture consisting of 70-99 percent by volume of said mullite fibers and 1-30 percent by volume of said glass wherein the glass reacts and bonds the mullite fibers at a temperature below the decomposition temperature of the fibers.
Claim 4
Dependent Claim
97 words
A mixture of mullite (3Al 2 O 3 .2SiO 2 ) fibers and a low expansion reactive glass, having one of the following compositions 80.5 SiO 2 --12.9 B 2 O 3 --3.8 Na 2 O--2.2 Al 2 O 3 --0.4 K 2 O, or 67.0 SiO 2 --27.4 BaO--5.6 Al 2 O 3 (all in weight percent); the mixture consisting of 70-99 percent by volume of said mullite fibers and 1-30 percent by volume of said glass wherein the glass reacts and bonds the mullite fibers at a temperature below the decomposition temperature of the fibers.
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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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |