US4740406A
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US
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Porous ceramic structure
Assignee: Bridgestone Corp
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Filing: 1986-03-05
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Granted: 1988-04-26
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Expires: 2006-03-05
Abstract
Abstract Described herein is a porous ceramic structure consisting of a ceramic roll core or an assembly of ceramic roll cores each comprising: consecutively aligned pairs of inclined cylindrical cell units of oblique figure "8" shape, each cylindrical cell unit having a width of 5-30 mm, a height of 10-100 mm and an angle of inclination of 20-70 degrees.
Inventors
- 👤 Tsuneaki Narumiya
- 👤 Hirotsugu Masuda
- 👤 Eigo Tanuma
- 👤 Munehiko Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:46
CPC Classifications
F; F27; F27D; F27D17/00; F27D17/30; F27D17/302; C; C04; C04B; C04B38/00; C04B38/0006; F16; F16L; F16L59/00; F16L59/02; F16L59/028; F27D1/00; F27D1/0003; F27D1/0006; F27D1/003; C04B2111/00; C04B2111/00474; C04B2111/00612; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/234; Y10T428/236; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
101 words
A gas permeable heat insulator capable of being fitted in an exhaust port or exhaust gas passage of a furnace for the purpose heat energy of exhaust gases by heat exchange as the gases pass through the gas permeable heat insulator of shielding the furnace from radiation cooling and collecting the comprising a ceramic roll core or an assembly of ceramic roll cores each comprising: consecutively aligned pairs of inclined cylindrical cell units of oblique figure "8" shape, each cylindrical cell unit having a width of 5-30 mm, a height of 10-100 mm and an angle of inclination of 20-70 degrees.
Claim 2
Dependent Claim
101 words
A gas permeable heat insulator capable of being fitted in an exhaust port or exhaust gas passage of a furnace for the purpose heat energy of exhaust gases by heat exchange as the gases pass through the gas permeable heat insulator of shielding the furnace from radiation cooling and collecting the comprising a ceramic roll core or an assembly of ceramic roll cores each comprising: consecutively aligned pairs of inclined cylindrical cell units of oblique figure "8" shape, each cylindrical cell unit having a width of 5-30 mm, a height of 10-100 mm and an angle of inclination of 20-70 degrees.
Claim 3
Dependent Claim
35 words
The porous ceramic structure of claim 1, wherein said roll core is provided with openings in the walls of the respective cylindrical cell units, communicating adjacent cylindrical cell units with each other through said openings.
Claim 4
Dependent Claim
23 words
The porous ceramic structure of claim 1, comprising two or more of said roll cores or roll core assemblies in a stacked form.
Claim 5
Dependent Claim
43 words
The porous ceramic structure of claim 1, wherein said roll core or roll core assembly is sandwiched between outer porous ceramic bodies having three-dimensional interconnected open cells to let a fluiud hit against the interconnected open cells; repeatedly as said fluid flows therethrough.
Claim 6
Dependent Claim
34 words
The porous ceramic structure of claim 4, wherein the porous ceramic body of at least one of said outer layers is of ceramic foam having a three-dimensional netlike structure with intercommunicating internal void spaces.
Claim 7
Dependent Claim
32 words
The porous ceramic structure of claim 4, wherein the porous ceramic body of at least one of said outer layers is of a cermaic needle structure consisting of overlappingly connected ceramic needles.
Claim 8
Dependent Claim
35 words
The porous ceramic structure of claim 1, wherein said roll core is provided with cavities in the walls of said cylindrical cell units, said cavities being opened at one axial end of said roll core.
Claim 9
Dependent Claim
31 words
The porous ceramic structure of claim 1, wherein each cylindrical cell unit has a width of 7-18 mm; a height of 15-30 mm and an angle of inclination of 30-65 degrees.
Claim 10
Dependent Claim
18 words
The porous ceramic structure of claim 3, wherein the stacked roll cores or roll core assemblies are staggered.
Claim 11
Dependent Claim
81 words
The porous ceramic structure of claim 1, wherein the ceramic roll cores are manufactured by drying and sintering ceramic slurry which is deposited on a substrate roll core or an assembly of a number of bonded substrate roll cores, which is in turn formed by alternately folding an elongated strip of paper or plastic sheet in such a manner as to form a figure "8" consecutively in an oblique fashion and cutting the opposite ends of the cylindrical cell units obliquely.
Claim 12
Independent Claim
101 words
A method of shielding a furnace from radiation comprising: fitting a gas permeable heat insulator in an exhaust port or exhaust gas passage of the furnace so that the exhaust gas will impinge on the walls of the heat insulator, said gas permeable heat insulator being made of a porous ceramic structure comprising ceramic roll core or an assembly of ceramic roll cores each comprising consecutively aligned pairs of inclined cylindrical cell units of oblique figure "8" shape, each cylindrical cell unit having a width of 5-30 mm, a height of 10-100 mm and an angle of inclination of 20-70 degrees.
Claim 13
Independent Claim
101 words
A method of shielding a furnace from radiation comprising: fitting a gas permeable heat insulator in an exhaust port or exhaust gas passage of the furnace so that the exhaust gas will impinge on the walls of the heat insulator, said gas permeable heat insulator being made of a porous ceramic structure comprising ceramic roll core or an assembly of ceramic roll cores each comprising consecutively aligned pairs of inclined cylindrical cell units of oblique figure "8" shape, each cylindrical cell unit having a width of 5-30 mm, a height of 10-100 mm and an angle of inclination of 20-70 degrees.
Claim 14
Dependent Claim
33 words
The method of claim 11, wherein said roll core is provided with openings in the walls of the respective cylindrical cell units, communicating adjacent cylindrical cell units with each other through said openings.
Claim 15
Dependent Claim
26 words
The method of claim 11, wherein said porous ceramic structure comprises two or more of said roll cores or roll core assemblies in a stacked form.
Claim 16
Dependent Claim
40 words
The method of claim 11, wherein said roll core or roll core assembly is sandwiched between outer porous ceramic bodies having three-dimensional interconnected open cells to let a fluid hit against the interconnected open cells as said fluid flows therethrough.
Claim 17
Dependent Claim
31 words
The method of claim 14, wherein the porous ceramic body of at least one of said outer layers comprises ceramic foam having a three-dimensional netlike structure with intercommunicating internal void spaces.
Claim 18
Dependent Claim
28 words
The method of claim 14, wherein the porous ceramic body of at least one of said outer layers comprises a ceramic needle structure comprising overlapping connected ceramic needles.
Claim 19
Dependent Claim
33 words
The method of claim 11, wherein said roll core is provided with cavities in the walls of said cylindrical cell units, said cavities being opened at one axial end of said roll core.
Claim 20
Dependent Claim
37 words
The porous ceramic structure of claim 11, wherein each cylindrical cell unit has a width of 7 to 18 mm, a height of 15 to 30 mm, and an angle of inclination of 30 to 65 degrees.
Claim 21
Dependent Claim
16 words
The method of claim 13, wherein the stacked roll cores or roll core assemblies are staggered.
Claim 22
Dependent Claim
79 words
The method of claim 11, wherein the ceramic roll cores are manufactured by drying and sintering ceramic slurry which is deposited on a substrate roll core or an assembly of a number of bonded substrate roll cores, which is in turn formed by alternately folding an elongated strip of paper or plastic sheet in such a manner as to form a figure "8" consecutively in an oblique fashion and cutting the opposite ends of the cylindrical cell units obliquely.
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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) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |