US4859525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for low temperature processing of lightweight SiC/SiO2 composites and products
Assignee: GRYPHON VENTURES II LP
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Filing: 1985-02-25
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Granted: 1989-08-22
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Expires: 2005-02-25
Abstract
Abstract A composite made by preparing a SiO2 sol, mixing 20-90% by volume of SiC particulate with the SiO2 sol to form a slurry, casting the slurry into a mold optionally containing SiC weaves or mats, gelling and aging the cast slurry and drying to obtain a green body composite.
Inventors
- 👤 Larry L. Hench
- 👤 Burtrand I. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; B; B32; B32B; B32B18/00; C04B35/01; C04B35/14; C04B35/515; C04B35/56; C04B35/565; C04B35/624; C04B35/62605; C04B35/6261; C04B35/6262; C04B35/71; C04B35/78; C04B35/80; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/34; C04B2235/3418; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/3834; C04B2235/44; C04B2235/441; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5244; C04B2235/526; C04B2235/5264; C04B2235/5268; C04B2235/5276; C04B2235/60; C04B2235/608; C04B2235/65; C04B2235/656; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; C04B2235/9669; C04B2235/9684; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/38; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T442/00; Y10T442/20; Y10T442/2926
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A method for making a plural layer composite comprising forming a layer of SiC particulate containing SiO 2 gel and forming a contiguous layer of SiC in the form of a structure selected from the group consisting of fibers, whiskers, weaves and mats embedded in a matrix of SiC particulate containing SiO 2 gel.
Claim 2
Independent Claim
54 words
A method for making a plural layer composite comprising forming a layer of SiC particulate containing SiO 2 gel and forming a contiguous layer of SiC in the form of a structure selected from the group consisting of fibers, whiskers, weaves and mats embedded in a matrix of SiC particulate containing SiO 2 gel.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein multilayers are contiguously formed with the outer layer formed of SiC particulate containing SiO 2 gel.
Claim 4
Dependent Claim
47 words
A plural layer composite comprising a first layer composed of SiC containing SiO 2 gel and a second contiguous layer composed of a SiC structure selected from the group consisting of fibers, whiskers, weaves and mats embedded in a matrix of SiC particulate containing SiO 2 gel.
Claim 5
Dependent Claim
47 words
A plural layer composite comprising a first layer composed of SiC containing SiO 2 gel and a second contiguous layer composed of a SiC structure selected from the group consisting of fibers, whiskers, weaves and mats embedded in a matrix of SiC particulate containing SiO 2 gel.
Claim 6
Dependent Claim
19 words
The plural layer composite of claim 3 having an outer layer formed of SiC particulate containing SiO 2 gel.
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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |