Patent US3216127A successfully refreshed from Google Patents.
Patent US5145613A successfully refreshed from Google Patents.
US5145613A
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Process for producing a heat-resistant alumina fiber mat
Assignee: Denka Co Ltd
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Filing: 1991-01-18
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Granted: 1992-09-08
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Expires: 2011-01-18
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 includes 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
2026-11-02 15:38
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; D04H1/4218; D04H1/4242; D04H1/44; D04H1/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A process for producing a heat-resistant alumina fiber mat comprising accumulating a precursor of alumina staple fibers to obtain an accumulated mass, sewing said accumulated mass with a precursor of continuous alumina filaments to form a sewn mass and then sintering the sewn mass to convert said precursor of alumina staple fibers and said precursor of continuous alumina filaments into alumina staple fibers and continuous alumina filaments.
Claim 2
Dependent Claim
67 words
A process for producing a heat-resistant alumina fiber mat comprising accumulating a precursor of alumina staple fibers to obtain an accumulated mass, sewing said accumulated mass with a precursor of continuous alumina filaments to form a sewn mass and then sintering the sewn mass to convert said precursor of alumina staple fibers and said precursor of continuous alumina filaments into alumina staple fibers and continuous alumina filaments.
Claim 3
Dependent Claim
16 words
A process according to claim 1 comprising sintering said sewn mass at 1000° to 1400° C.
Claim 4
Dependent Claim
47 words
A process according to claim 1 wherein said precursor of alumina staple fibers is obtained by centrifugally dispersing a starting solution containing an aqueous solution of aluminum oxychloride and an aqueous solution of a water-soluble organic polymer and drying the dispersed solution by a hot air current.
Claim 5
Dependent Claim
36 words
A process according to claim 1 wherein said precursor of continuous alumina filaments is obtained by extruding a starting solution containing an aqueous solution of aluminum oxychloride and an aqueous solution of a water-soluble organic polymer.
Claim 6
Dependent Claim
22 words
A process according to claim 1 wherein said precursor of continuous alumina filaments are reinforced by being entwined with high strength fibers.
Claim 7
Dependent Claim
25 words
A process according to claim 5 wherein said high strength fibers are selected from the group consisting of glass fibers, carbon fibers and organic fibers.
Claim 8
Dependent Claim
23 words
A process according to claim 1 wherein said precursor of continuous alumina filaments are reinforced by being immersed in a binder and dried.
Claim 9
Dependent Claim
21 words
A process according to claim 1 comprising sewing said accumulated mass with an upper yarn of said precursor of continuous alumina.
Claim 10
Dependent Claim
26 words
A process according to claim 1 comprising sewing said accumulated mass with an upper yarn and a lower yarn of said precursor of continuous alumina filaments.
References Cited (Backward Citations)
US3996145A
Cited
US5041321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |