US2957789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor devices and methods of preparing the same
Assignee: General Electric Co
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Filing: 1959-03-13
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Granted: 1960-10-25
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Expires: 1979-03-13
Abstract
No abstract record available.
Inventors
- 👤 Erik M Pell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:42
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/06; C30B13/00; C30B15/00; C30B15/10; H; H10; H10D; H10D99/00; H10P; H10P32/00; H10P32/10; H10P32/185; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/039; Y10S148/051; Y10S438/00; Y10S438/914; Y10S438/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE METHOD OF PREPARING A THERMALLY STABLE BODY OF SEMICONDUCTOR MATERIAL SELECTED FROM THE GROUP CONSISTING OF GERMANIUM AND SILICON AND HAVING AN N-TYPE REGION THEREIN CONTAINING LITHIUM AS A DONOR WHICH METHOD COMPRISES: PREPARING AN INGOT OF THE MATERIAL OF SEMICONDUCTOR PURITY, GROWING A CRYSTALLINE INGOT THEREOF CONTAINING A CONCENTRATION OF OXYGEN ABOUT 10**18 ATOMS THEREOF PER CUBIC CENTIMETER, CUTTING A WAFER THEREFROM, AND DIFFUSING A CONCENTRATION OF 10**13 TO 2X10**18 ATOMS PER CUBIC CENTIMETER THEREOF OF LITHIUM INTO AT LEAST A SURFACE-ADJACENT REGION OF SAID WAFER.
Claim 2
Independent Claim
88 words
THE METHOD OF PREPARING A THERMALLY STABLE BODY OF SEMICONDUCTOR MATERIAL SELECTED FROM THE GROUP CONSISTING OF GERMANIUM AND SILICON AND HAVING AN N-TYPE REGION THEREIN CONTAINING LITHIUM AS A DONOR WHICH METHOD COMPRISES: PREPARING AN INGOT OF THE MATERIAL OF SEMICONDUCTOR PURITY, GROWING A CRYSTALLINE INGOT THEREOF CONTAINING A CONCENTRATION OF OXYGEN ABOUT 10**18 ATOMS THEREOF PER CUBIC CENTIMETER, CUTTING A WAFER THEREFROM, AND DIFFUSING A CONCENTRATION OF 10**13 TO 2X10**18 ATOMS PER CUBIC CENTIMETER THEREOF OF LITHIUM INTO AT LEAST A SURFACE-ADJACENT REGION OF SAID WAFER.
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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |