US4284664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced ceramics produced without pressing or sintering using a slurry comprising a silicate and a powdered ceramic
Assignee: Lockheed Martin Corp
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Filing: 1979-12-05
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Granted: 1981-08-18
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Expires: 1999-12-05
Abstract
Abstract Fiber reinforced ceramics are produced without pressing or sintering by treating the fibrous reinforcement with an aqueous slurry comprising an alkali silicate and a ceramic powder and thereafter drying.
Inventors
- 👤 Harry W. Rauch, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:59
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C04B35/00; C04B35/01; C04B35/14; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62665; C04B35/63; C04B35/6303; C04B35/6316; C04B35/71; C04B35/78; C04B35/80; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5232; C04B2235/524; C04B2235/5248; C04B2235/60; C04B2235/604; C04B2235/606; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/30; Y10T442/00; Y10T442/20; Y10T442/2861; Y10T442/2893; Y10T442/2902; Y10T442/2926
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
32 words
A ceramic composite prepared without pressing or sintering by: applying to a reinforcing medium a slurry of an aqueous alkali silicate and a powdered ceramic; and removing the moisture content by drying.
Claim 2
Dependent Claim
32 words
A ceramic composite prepared without pressing or sintering by: applying to a reinforcing medium a slurry of an aqueous alkali silicate and a powdered ceramic; and removing the moisture content by drying.
Claim 3
Dependent Claim
15 words
A ceramic composite in accordance with claim 1 wherein: said composite is compressed during drying.
Claim 4
Dependent Claim
22 words
A ceramic composite in accordance with claim 1 wherein: said composite is first air dried at room temperature and then slowly heated.
Claim 5
Dependent Claim
62 words
A ceramic composite in accordance with claim 1 wherein: said aqueous alkali silicate is from the group consisting of: potassium silicate, and sodium silicate; said powdered ceramic is from the group consisting of: finely divided amorphous silica, fused silica powder, and glass powder; and said reinforcing medium is from the group consisting of: graphite fibers, fused silica cloth, and aramid fiber cloth.
Claim 6
Dependent Claim
38 words
A process for preparing a composite ceramic without pressing or sintering comprising the steps of: applying to a reinforcing medium a slurry of an aqueous alkali silicate and a powdered ceramic; and removing the moisture content by drying.
Claim 7
Dependent Claim
38 words
A process for preparing a composite ceramic without pressing or sintering comprising the steps of: applying to a reinforcing medium a slurry of an aqueous alkali silicate and a powdered ceramic; and removing the moisture content by drying.
Claim 8
Dependent Claim
14 words
A process in accordance with claim 5 wherein: said composite is compressed during drying.
Claim 9
Dependent Claim
21 words
A process in accordance with claim 5 wherein: said composite is first air dried at room temperature and then slowly heated.
Claim 10
Dependent Claim
61 words
A process in accordance with claim 5 wherein: said aqueous alkali silicate is from the group consisting of: potassim silicate, and sodium silicate; said powdered ceramic is from the group consisting of: finely divided amorphous silica, fused silica powder, and glass powder; and said reinforcing medium is from the group consisting of: graphite fibers, fused silica cloth, and aramid fiber cloth.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |