US5047289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant alumina fiber mat
Assignee: Denka Co Ltd
•
Filing: 1990-01-09
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Granted: 1991-09-10
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Expires: 2010-01-09
Abstract
Abstract A heat-resistant alumina fiber mat contains an accumulated mass of alumina staple fibers and continuous alumina filaments. The accumulated mass is sewn with the continuous alumina filaments. A process for producing a heat-resistant alumina fiber mat comprises accumulating a precursor of alumina staple fibers to obtain an accumulated mass, sewing the accumulated mass with continuous filaments to give a sewn mass and then sintering the sewn mass. The continuous filaments may be continuous alumina filaments or a precursor thereof.
Inventors
- 👤 Noriyuki Arano
- 👤 Michiyo Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:33
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/52; C; C04; C04B; C04B30/00; C04B30/02; D04H1/42; D04H1/4209; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
57 words
A heat-resistant sintered alumina fiber mat comprising an accumulated mass of alumina staple fibers and continuous alumina filaments, said accumulated mass being sewn with said continuous alumina filaments, the staple alumina fibers and continuous alumina filaments being adhered to and reacted with each other, said continuous alumina filaments being reinforced by said reinforcing material before being sintered.
Claim 2
Dependent Claim
57 words
A heat-resistant sintered alumina fiber mat comprising an accumulated mass of alumina staple fibers and continuous alumina filaments, said accumulated mass being sewn with said continuous alumina filaments, the staple alumina fibers and continuous alumina filaments being adhered to and reacted with each other, said continuous alumina filaments being reinforced by said reinforcing material before being sintered.
Claim 3
Dependent Claim
24 words
A mat according to claim 1 wherein said alumina staple fibers have an Al 2 O 3 content of 60 to 100 wt %.
Claim 4
Dependent Claim
24 words
A mat according to claim 1 wherein said continuous alumina filaments have an Al 2 O 3 content of 60 to 100 wt %.
Claim 5
Dependent Claim
29 words
A mat according to claim 1 wherein the contents of said continuous alumina filaments are not higher than 20 wt. % based on the total weight of the mat.
Claim 6
Dependent Claim
23 words
A mat according to claim 1 wherein the number of stitched points per 3 cm 2 of the mat area at least one.
Claim 7
Dependent Claim
28 words
A mat according to claim 1 wherein alumina forming said staple fibers and said continuous filaments is selected from the group consisting of the same and different compositions.
Claim 8
Dependent Claim
87 words
A mat according to claim 1 wherein the alumina forming said staple fibers and said continuous filaments contains components selected from the group consisting of Al 2 O 3 , Al 2 O 3 -SiO 2 , Al 2 O 3 -MgO, Al 2 O 3 -MgO-SiO 2 , Al 2 O 3 -ZrO 2 , Al 2 O 3 -ZrO 2 -SiO 2 , Al 2 O 3 -Cr 2 O 3 -SiO 2 and Al 2 O 3 -B 2 O 3 -SiO 2 .
Claim 9
Dependent Claim
73 words
A mat according to claim 1 wherein the mat is obtained by accumulating a precursor of alumina staple fibers to produce an accumulated mass, sewing said accumulated mass with continuous filaments reinforced by a reinforcing material selected from the group consisting of continuous alumina filaments reinforced by a reinforcing material and a precursor of the continuous alumina filaments reinforced by a reinforcing material to produce a sewn mass, and sintering said sewn mass.
Claim 10
Dependent Claim
17 words
A mat according to claim 8 wherein said sewn mass is sintered at 1000° to 1400° C.
Claim 11
Dependent Claim
48 words
A mat according to claim 8 wherein said precursor of said alumina staple fibers are centrifugally dispersed filaments dispersed from a starting solution containing an aqueous solution of aluminum oxychloride and an aqueous solution of a water-soluble organic polymer, the filaments being dried by a hot air current.
Claim 12
Dependent Claim
37 words
A mat according to claim 8 wherein the precursor of the continuous alumina filaments are extruded filaments extruded from a starting solution containing an aqueous solution of aluminum oxychloride and an aqueous solution of an organic polymer.
Claim 13
Dependent Claim
38 words
A mat according to claim 1 wherein said continuous alumina filaments are reinforced by the reinforcing material selected from the group consisting of high strength continuous filament yarns, high strength continuous filament fibers, organic binders and inorganic binders.
Claim 14
Dependent Claim
48 words
A mat according to claim 1 wherein said continuous alumina filaments are reinforced by entwining the continuous alumina filaments with the reinforcing material selected from the group consisting of glass filaments, carbon filaments, polyvinyl alcohol filaments, polyvinyl chloride filaments, polyester filaments, polyacrylonitrile filaments, nylon filaments and mixtures thereof.
Claim 15
Dependent Claim
43 words
A mat according to claim 1 wherein said continuous alumina filaments are reinforced by immersing the continuous alumina filaments in the reinforcing material selected from the group consisting of silica sol, alumina sol, polyvinyl alcohol and methylcellulose, followed by drying the reinforcing material.
References Cited (Backward Citations)
US3853688A
Cited
GB1425934A
Cited
US3953561A
Cited
US3996145A
Cited
US4125406A
Cited
US4752515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |