US4148962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous refractory composite insulation
Assignee: National Aeronautics and Space Administration
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Filing: 1978-09-08
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Granted: 1979-04-10
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Expires: 1998-09-08
Abstract
Abstract A refractory composite insulating material prepared from silica fibers and aluminosilicate fibers in a weight ratio ranging from 1:19 to 19:1, and about 0.5 to 30% boron oxide, based on the total fiber weight. The aluminosilicate fiber and boron oxide requirements may be satisfied by using aluminoborosilicate fibers and, in such instances, additional free boron oxide may be incorporated in the mix up to the 30% limit. Small quanitites of refractory opacifiers, such as silicon carbide, may be also added. The composites just described are characterized by the absence of a nonfibrous matrix.
Inventors
- 👤 with respect to an invention of Frosch Robert A. Administrator of the National Aeronautics and Space Administration
- 👤 Daniel B. Leiser
- 👤 Howard E. Goldstein
- 👤 Marnell Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:27
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
38 words
A refractory composite consisting essentially of aluminosilicate fibers and silica fibers in a weight ratio within the range of about 19:1 to 1:19, and about 0.5 to 30% boron oxide, based on the total weight of the fibers.
Claim 2
Dependent Claim
38 words
A refractory composite consisting essentially of aluminosilicate fibers and silica fibers in a weight ratio within the range of about 19:1 to 1:19, and about 0.5 to 30% boron oxide, based on the total weight of the fibers.
Claim 3
Dependent Claim
19 words
The refractory composite of claim 1 wherein the fibers range in diameter from about 1 to about 15 microns.
Claim 4
Dependent Claim
21 words
The refractory composite of claim 1 wherein the boron oxide and aluminosilicate fibers are present in the form of aluminoborosilicate fibers.
Claim 5
Dependent Claim
18 words
The refractory composite of claim 3 also comprising boron oxide, in addition to that present in the fibers.
Claim 6
Dependent Claim
33 words
The refractory composite of claim 3 wherein the aluminoborosilicate fibers range in diameter from about 3 to 12 microns and the silica fibers range in diameter from about 1 to about 6 microns.
Claim 7
Dependent Claim
12 words
The refractory composite of claim 1 also comprising a refractory opacifying material.
Claim 8
Dependent Claim
33 words
The refractory composite of claim 1 wherein the aluminosilicate fiber to silica fiber ratio ranges from 1:9 to 2:3 and the boron oxide content is about 1 to 6% of the fiber weight.
Claim 9
Dependent Claim
34 words
A refractory composite prepared from aluminoborosilicate fibers containing about 14% boron oxide and pure silica fibers in a weight ratio of about 4:1 and about 3.5% silicon carbide, based on weight of the fibers.
Claim 10
Dependent Claim
34 words
A refractory composite prepared from aluminoborosilicate fibers containing about 14% boron oxide and pure silica fibers in a weight ratio of about 4:1 and about 3.5% silicon carbide, based on weight of the fibers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |