US4612082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arsenic cell stabilization valve for gallium arsenide in-situ compounding
Assignee: Texas Instruments Inc
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Filing: 1985-02-13
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Granted: 1986-09-16
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Expires: 2005-02-13
Abstract
Abstract A quartz arsenic cell having a stabilizing valve used to generate hot arsenic vapor which is flowed into liquid gallium, to provide a melt of liquid gallium arsenide from which a crystal can be pulled. The stabilizing valve prevents negative relative pressure from occurring in the quartz arsenic cell, and thus prevents the molten material from being sucked back up into the quartz arsenic cell.
Inventors
- 👤 Glenn H. Westphal
- 👤 Jimmie B. Sherer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:19
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
A method of growing single crystals of a compound semiconductor, wherein one element of said compound semiconductor is more volatile and wherein another element of said compound semiconductor is less volatile, comprising the steps of: measuring a predetermined amount of said less volatile element into a crucible, a sublimation cell including a vapor injection tube downwardly extending from said sublimation cell; measuring a predetermined amount of said more volatile element into said sublimation cell, said respective predetermined amounts being selected to achieve a desired ratio of said volatile element to said nonvolatile element in a melt; heating said crucible, to melt said less volatile element; immersing said injection tube in said melt of said less volatile element; and heating said sublimation cell, so that said volatile element passes into said melt in the vapor phase and is compounded with said less volatile element in said melt; wherein said sublimation cell further comprises a check valve connected to prevent the interior of said sublimation cell from having a lower pressure than the exterior of said sublimation cell.
Claim 2
Independent Claim
176 words
A method of growing single crystals of a compound semiconductor, wherein one element of said compound semiconductor is more volatile and wherein another element of said compound semiconductor is less volatile, comprising the steps of: measuring a predetermined amount of said less volatile element into a crucible, a sublimation cell including a vapor injection tube downwardly extending from said sublimation cell; measuring a predetermined amount of said more volatile element into said sublimation cell, said respective predetermined amounts being selected to achieve a desired ratio of said volatile element to said nonvolatile element in a melt; heating said crucible, to melt said less volatile element; immersing said injection tube in said melt of said less volatile element; and heating said sublimation cell, so that said volatile element passes into said melt in the vapor phase and is compounded with said less volatile element in said melt; wherein said sublimation cell further comprises a check valve connected to prevent the interior of said sublimation cell from having a lower pressure than the exterior of said sublimation cell.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein said sublimation cell is heated until all of said predetermined amount of said more volatile element is vaporized.
Claim 4
Dependent Claim
21 words
The method of claim 1, further comprising the subsequent step of pulling a crystal of said compound semiconductor from said melt.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein said sublimation cell is heated to sublime said more volatile element at a rate of less than 3000 grams per hour.
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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |