US2842467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of growing semi-conductors
Assignee: International Business Machines Corp
•
Filing: 1954-04-28
•
Granted: 1958-07-08
•
Expires: 1974-04-28
Abstract
No abstract record available.
Inventors
- 👤 Rolf W Landauer
- 👤 Lloyd P Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:34
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/20; C30B15/14; C30B15/18; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD OF GROWING A SEMI-CONDUCTOR CRYSTAL COMPRISING THE STEPS OF MAINTAINING A PURE ELEMENTAL SEMICONDUCTOR MATERIAL WITH SELECTED CONDUCTIVITY TYPE DETERMINING IMPURITIES IN A MELTED CONDITION, SUPPORTING A SEED CRYSTAL OF TE SAME MATERIAL IN ENGAGEMENT WITH THE UPPER SURFACE OF SAID MELT, APPLYING A DIRECT CURRENT ELECTRIC FIELD ACROSS SAID SEED CRYSTAL AND SAID MELT, AND LIFTING SAID SEED CRYSTAL SLOWLY TO PERMIT A FREEZING OF THE MELT ON THE LOWER END OF THE CRYSTAL WHILE SAID ELECTRIC FIELD IS MAINTAINED.
Claim 2
Independent Claim
83 words
A METHOD OF GROWING A SEMI-CONDUCTOR CRYSTAL COMPRISING THE STEPS OF MAINTAINING A PURE ELEMENTAL SEMICONDUCTOR MATERIAL WITH SELECTED CONDUCTIVITY TYPE DETERMINING IMPURITIES IN A MELTED CONDITION, SUPPORTING A SEED CRYSTAL OF TE SAME MATERIAL IN ENGAGEMENT WITH THE UPPER SURFACE OF SAID MELT, APPLYING A DIRECT CURRENT ELECTRIC FIELD ACROSS SAID SEED CRYSTAL AND SAID MELT, AND LIFTING SAID SEED CRYSTAL SLOWLY TO PERMIT A FREEZING OF THE MELT ON THE LOWER END OF THE CRYSTAL WHILE SAID ELECTRIC FIELD IS MAINTAINED.
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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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |