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Patent US3607222A successfully refreshed from Google Patents.
US3607222A
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US
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Method for evaporating alloy
Assignee: Airco Inc
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Filing: 1968-11-26
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Granted: 1971-09-21
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Expires: 1988-11-26
Abstract
Abstract A method is described for evaporating an alloy from a single crucible in a vacuum enclosure. A solid bar of alloy is fed upwardly into the crucible from the bottom thereof. The alloy is heated to form a covering pool and to produce evaporation. The feed rate of the solid bar is regulated to maintain a substantially constant level of molten alloy relative to the crucible.
Inventors
- 👤 Kurt D Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:35
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/246
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A method according to claim 1 wherein the crucible is cooled.
Claim 2
Dependent Claim
24 words
A method according to claim 1 including controlling the heat losses out of the bottom of the solid bar to maintain them substantially constant.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the heating is accomplished by means of an electron beam.
Claim 4
Independent Claim
157 words
A method for evaporating an alloy, from a single cooled crucible in a vacuum enclosure, said alloy, in the molten condition, including at least two metals one of which is at least twice as volatile as the other, comprising: cooling the crucible, feeding a solid bar of alloy of substantially the same cross section as the crucible interior upwardly into the crucible from the bottom thereof, heating the surface of the bar of alloy in the crucible to form a molten pool completely covering the solid end of the bar and to produce evaporation, controlling the cooling rate and the heat losses out of the bottom of the solid bar to maintain a substantially balanced condition of heat removal to heat input, and regulating the feed rate of the solid bar to maintain a substantially constant level of molten alloy relative to the crucible and thereby replenish the alloy at substantially the same rate as its evaporation.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |