US4031851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing improved high strength filaments
Assignee: Individual
•
Filing: 1974-04-18
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Granted: 1977-06-28
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Expires: 1994-04-18
Abstract
Abstract Fabrication apparatus is described for improving the ultimate strength of boron and other high strength filaments. In the apparatus, a gradual cooling zone is placed at the exit end of the reaction zone to prevent the sudden thermal shock normally encountered when hot boron filaments exit into the ambient atmosphere. A preheating zone can be added prior to the entrance into the reaction zone if desired. Additionally, the entrance and exit ends of the reaction zone are sealed with a molten metal, such as tin, heated to elevated temperatures close to the reaction temperature. These molten metal electrodes tend to minimize deposition of weak boron due to a low temperature region immediately following the reactor entrance and help to eliminate sudden thermal shocks to the filaments at the exit.
Inventors
- 👤 Jose L. Camahort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:10
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/44; C23C16/54; C23C16/545; C23C16/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A vapor deposition apparatus for forming composite, high strength filaments having a core material and a sheath material, comprising: a. a reactor, including: (1) a reaction zone; (2) means for directing said core material through said reaction zone; (3) means to seal said reaction zone at its entrance end; (4) means to seal said reaction zone at its exit end, said means to seal comprising an inert, low-melting, high-boiling metal; (5) means to introduce a gaseous source of sheath material of boron to said reaction zone; (6) means to exhaust reaction gases from said reaction zone; (7) means to selectively heat said core to a temperature at least equal to the temperature at which the sheath material deposits onto the core material. b. means for controllably cooling said composite material after it exits from the reactor and before it enters the ambient atmosphere to prevent buildup of internal stresses in said composite filament which substantially diminish its strength.
Claim 2
Dependent Claim
158 words
A vapor deposition apparatus for forming composite, high strength filaments having a core material and a sheath material, comprising: a. a reactor, including: (1) a reaction zone; (2) means for directing said core material through said reaction zone; (3) means to seal said reaction zone at its entrance end; (4) means to seal said reaction zone at its exit end, said means to seal comprising an inert, low-melting, high-boiling metal; (5) means to introduce a gaseous source of sheath material of boron to said reaction zone; (6) means to exhaust reaction gases from said reaction zone; (7) means to selectively heat said core to a temperature at least equal to the temperature at which the sheath material deposits onto the core material. b. means for controllably cooling said composite material after it exits from the reactor and before it enters the ambient atmosphere to prevent buildup of internal stresses in said composite filament which substantially diminish its strength.
Claim 3
Dependent Claim
36 words
The vapor deposition apparatus of claim 1 wherein said means to seal said reaction zone at its exit end comprises a molten metal seal wherein the metal is selected from tin, lead, bismuth, antimony and thallium.
Claim 4
Dependent Claim
26 words
The vapor deposition apparatus of claim 2 wherein said means for directing core material includes means to pass tungsten or carbon monofilament through said reaction zone.
Claim 5
Dependent Claim
36 words
The vapor deposition apparatus of claim 3 wherein said means to seal said reaction zone at its entrance end comprises a molten metal seal wherein the metal is selected from tin, lead, bismuth, antimony and thallium.
Claim 6
Dependent Claim
16 words
The vapor deposition apparatus of claim 4 wherein said gaseous source of boron comprises boron trichloride.
Claim 7
Dependent Claim
25 words
The vapor deposition apparatus of claim 2 additionally including a preheating zone for gradually heating filament material prior to its entrance into the reaction zone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |