Patent US5239567A successfully refreshed from Google Patents.
US5079082A
Expired / Lapsed
US
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Toughened uni-piece fibrous insulation
Assignee: National Aeronautics and Space Administration
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Filing: 1989-01-18
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Granted: 1992-01-07
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Expires: 2009-01-18
Abstract
Abstract A porous body of fibrous, low density silica-based insulation material is at least in part impregnated with a reactive boron oxide containing borosilicate glass frit, a silicon tetraboride fluxing agent and a molybdenum silicide emittance agent. The glass frit, fluxing agent and emittance agent are separately milled to reduce their particle size, then mixed together to produce a slurry in ethanol. The slurry is then applied to the insulation material and sintered to produce the porous body.
Inventors
- 👤 Daniel B. Leiser
- 👤 Marnell Smith
- 👤 Rex A. Churchward
- 👤 Victor W. Katvala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:30
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5022; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249957; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
A porous body of fibrous, low density silica-based insulation material, said porous body being at least in part impregnated with a mixture comprising a reactive glass frit, a fluxing agent and an emittance agent.
Claim 2
Dependent Claim
34 words
A porous body of fibrous, low density silica-based insulation material, said porous body being at least in part impregnated with a mixture comprising a reactive glass frit, a fluxing agent and an emittance agent.
Claim 3
Dependent Claim
35 words
The porous body of insulation material of claim 1 in which less than all of said porous body is impregnated with the mixture comprising the reactive glass frit, the fluxing agent and the emittance agent.
Claim 4
Dependent Claim
22 words
The porous body of insulation material of claim 1 in which said reactive glass frit comprises a boron oxide containing borosilicate glass.
Claim 5
Dependent Claim
25 words
The porous body of insulation material of claim 3 in which the borosilicate glass contains from about 2 to about 10 weight percent boron oxide.
Claim 6
Dependent Claim
17 words
The porous body of insulation material of claim 3 in which said fluxing agent comprises silicon tetraboride.
Claim 7
Dependent Claim
28 words
The porous body of insulation material of claim 5 in which said fluxing agent is present in an amount of from about 2 to about 10 weight percent.
Claim 8
Dependent Claim
17 words
The porous body of insulation material of claim 3 in which said emittance agent comprises molybdenum disilicide.
Claim 9
Dependent Claim
28 words
The porous body of insulation material of claim 7 in which said emittance agent is present in an amount of from about 5 to about 40 weight percent.
Claim 10
Dependent Claim
73 words
The porous body of insulation material of claim 8 in which said reactive glass frit comprises a boron oxide containing borosilicate glass and is present in the mixture in an amount of about 77.5 weight percent, said fluxing agent comprises silicon tetraboride and is present in the mixture in an amount of about 2.5 weight percent, and said emittance agent is present in the mixture in an amount of about 20 weight percent.
Claim 11
Dependent Claim
24 words
The porous body of insulation material of claim 8 in which said fibrous, low density silica-based insulation material is an alumina enhanced thermal barrier.
References Cited (Backward Citations)
US4093771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |