US3903323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing boron filament having a titanium carbide coated substrate
Assignee: RTX Corp
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Filing: 1973-12-26
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Granted: 1975-09-02
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Expires: 1993-12-26
Abstract
Abstract A method for producing a boron filament with a relatively thick, uniform coating of boron by passing a moving, resistively heated carbon substrate through a reactor in the presence of a boron halide admixed with hydrogen includes the step of first putting a coating of titanium carbide on the carbon substrate.
Inventors
- 👤 Francis S Galasso
- 👤 Bernarr A Jacob
- 👤 Robert B Graf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:04
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/02; C23C16/0272; C23C16/22; C23C16/28; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2942; Y10T428/2958
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
A METHOD FOR CONTINUOUSLY DEPOSITING NODE-FREE AMORPHORUS BORON TO UNIFORM THICKNESS GREATER THAN 0.6 MIL ON A MOVING RESISTIVELY HEATED CARBON WIRE AS IT IS DRAWN THROUGH A SERIES OF REACTORS COMPRISING THE STEPS OF: MAINTAINING THE CARBON WIRE IN THE FIRST REACTOR AT A TEMPERATURE OF 1100* TO 1400*C, EXPOSING THE CARBON WIRE WHILE AT SAID TAMPERATURE IN SAID FIRST REACTOR TO A GASEOUS STREAM CONSISTING ESSENTIALLY OF A CARBON-CONDUCTING GAS AND A DILUENT GAS, AT LEAST ONE OF SAID GASES HAVING BEEN SATURATED WITH TICL4 TO EFFECT DECOMPOSITION OF TITANIUM CARBIDE ON THE CARBON WIRE, MAINTAINING THE TITANIUM CARBIDE-COATED CARBON WIRE IN A SUBSEQUENT REACTOR AT A TEMPERATURE OF 700* TO 1400*C, AND EXPOSING THE WIRE IN SAID SUBSEQUENT REACTOR TO A GASEOUS STREAM OF A BORON HALIDE ADMIXED WITH HYDROGEN TO EFFECT DEPOSITION OF ELEMENTAL BORON THEREON, SAID DEPOSIT OF TITANIUM CARBIDE BEING DISPOSED TO CARRY THE CURRENT USED TO RESISTIVELY HEAT THE CARBON WIRE SHOULD SAID CARBON WIRE FRACTURE AS A RESULT OF THE BORON DEPOSITION PROCESS.
Claim 2
Independent Claim
171 words
A METHOD FOR CONTINUOUSLY DEPOSITING NODE-FREE AMORPHORUS BORON TO UNIFORM THICKNESS GREATER THAN 0.6 MIL ON A MOVING RESISTIVELY HEATED CARBON WIRE AS IT IS DRAWN THROUGH A SERIES OF REACTORS COMPRISING THE STEPS OF: MAINTAINING THE CARBON WIRE IN THE FIRST REACTOR AT A TEMPERATURE OF 1100* TO 1400*C, EXPOSING THE CARBON WIRE WHILE AT SAID TAMPERATURE IN SAID FIRST REACTOR TO A GASEOUS STREAM CONSISTING ESSENTIALLY OF A CARBON-CONDUCTING GAS AND A DILUENT GAS, AT LEAST ONE OF SAID GASES HAVING BEEN SATURATED WITH TICL4 TO EFFECT DECOMPOSITION OF TITANIUM CARBIDE ON THE CARBON WIRE, MAINTAINING THE TITANIUM CARBIDE-COATED CARBON WIRE IN A SUBSEQUENT REACTOR AT A TEMPERATURE OF 700* TO 1400*C, AND EXPOSING THE WIRE IN SAID SUBSEQUENT REACTOR TO A GASEOUS STREAM OF A BORON HALIDE ADMIXED WITH HYDROGEN TO EFFECT DEPOSITION OF ELEMENTAL BORON THEREON, SAID DEPOSIT OF TITANIUM CARBIDE BEING DISPOSED TO CARRY THE CURRENT USED TO RESISTIVELY HEAT THE CARBON WIRE SHOULD SAID CARBON WIRE FRACTURE AS A RESULT OF THE BORON DEPOSITION PROCESS.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said carbon-containing gas is methane and said diluent gas is hydrogen, said hydrogen being present in an amount of four to 19 parts per one part methane.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein said carbon wire in the first reactor is maintained at a temperature of 1300* to 1400*C.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |