US3640693A
Expired / Lapsed
US
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Method of forming silicon compound fibers
Assignee: RTX Corp
•
Filing: 1969-02-03
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Granted: 1972-02-08
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Expires: 1989-02-03
Abstract
Abstract A process for producing low-density high-modulus fibers including the steps of inserting silicon metal, preferably in powdered form, in a glass tube to form a composite, vacuum casting to melt the silicon metal in the tube, drawing the resulting glass-silicon composite rod into a fiber having a filamentary silicon core and an outer glass sheath, removing the glass sheath and contacting the exposed silicon core with a suitable reactant to form a silicon compound fiber.
Inventors
- 👤 Francis S Galasso
- 👤 Richard D Veltri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/984; C01B35/00; C01B35/02; C01B35/04; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/026; C03B37/027; C04B35/515; C04B35/58; C04B35/584; C04B35/591; C01P; C01P2004/00; C01P2004/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49801
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
The process described in claim 1 wherein said silicon filament is contacted with a reactant to form a silicon compound fiber.
Claim 2
Dependent Claim
18 words
The process described in claim 2 wherein said reactant is methane and a silicon carbide fiber is formed.
Claim 3
Dependent Claim
20 words
The process described in claim 7 wherein said glass tube has a silica content, by weight, of approximately 96 percent.
Claim 4
Dependent Claim
18 words
The process described in claim 2 wherein said reactant is ammonia and a silicon nitride fiber is formed.
Claim 5
Dependent Claim
19 words
The process described in claim 2 wherein said reactant is boron trichloride and a boron silicide fiber is formed.
Claim 6
Dependent Claim
31 words
The process described in claim 1 wherein said vacuum casting is achieved by passing the comPosite rod through a hot zone of 1, 550* C. at a speed of 30 cm./hour.
Claim 7
Dependent Claim
22 words
The process described in claim 1 wherein the fiberizing temperature of the glass is within a range of 1,865* to 1,890* C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |