US2889240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for growing semi-conductive single crystals from a melt
Assignee: RCA Corp
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Filing: 1956-03-01
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Granted: 1959-06-02
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Expires: 1976-03-01
Abstract
No abstract record available.
Inventors
- 👤 Fred D Rosi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:23
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/32; C30B13/00; C30B13/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE METHOD OF GROWING A SINGLE CRYSTAL OF A SEMICONDUCTIVE MATERIAL COMPRISING THE STEPS OF: MELTING AT LEAST A PORTION OF SAID MATERIAL, CONTACTING A SEED CRYSTAL OF SAID MATERIAL TO SAID MOLTEN PORTION, RELATIVELY MOVING SAID SEED CRYSTAL WITH RESPECT TO SAID MOLTEN PORTION WHEREBY SUCCESSIVE PORTIONS OF SAID MOLTEN PORTION ARE FROZEN-OUT ON SAID SEED CRYSTAL, ESTABLISHING AND MAINTAINING SAID FROZEN-OUT PORTION A TEMPERATURE GRADIENT OF BETWEEN 150 AND 400*C. PER CM. ADJACENT THE INTERFACE BETWEEN SAID FROZEN SOLID PORTIONS AND SAID MELT, AND MAINTAINING THE TEMPERATURE ACROSS SAID FROZEN SOLID PORTIONS RADIALLY UNIFORM WHEREBY SAID INTERFACE IS PLANAR IN A DIRECTION NORMAL TO THE DIRECTION OF CRYSTAL GROWTH.
Claim 2
Independent Claim
111 words
THE METHOD OF GROWING A SINGLE CRYSTAL OF A SEMICONDUCTIVE MATERIAL COMPRISING THE STEPS OF: MELTING AT LEAST A PORTION OF SAID MATERIAL, CONTACTING A SEED CRYSTAL OF SAID MATERIAL TO SAID MOLTEN PORTION, RELATIVELY MOVING SAID SEED CRYSTAL WITH RESPECT TO SAID MOLTEN PORTION WHEREBY SUCCESSIVE PORTIONS OF SAID MOLTEN PORTION ARE FROZEN-OUT ON SAID SEED CRYSTAL, ESTABLISHING AND MAINTAINING SAID FROZEN-OUT PORTION A TEMPERATURE GRADIENT OF BETWEEN 150 AND 400*C. PER CM. ADJACENT THE INTERFACE BETWEEN SAID FROZEN SOLID PORTIONS AND SAID MELT, AND MAINTAINING THE TEMPERATURE ACROSS SAID FROZEN SOLID PORTIONS RADIALLY UNIFORM WHEREBY SAID INTERFACE IS PLANAR IN A DIRECTION NORMAL TO THE DIRECTION OF CRYSTAL GROWTH.
References Cited (Backward Citations)
US2683676A
Cited
US2727840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |